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Therapeutic Promises of Medicinal Plants in Bangladesh and Their Bioactive Compounds against Ulcers and Inflammatory Diseases

Department of Plant and Environmental Biotechnology, Faculty of Biotechnology and Genetic Engineering, Sylhet Agricultural University, Sylhet 3100, Bangladesh
Department of Biotechnology, Yeungnam University, Gyeongsan 38541, Korea
School of Medicine, Deakin University, 75 Pigdons Rd, Waurn Ponds, Melbourne, VIC 3216, Australia
Department of Biotechnology and Genetic Engineering, Faculty of Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh
Department of Microbiology, Faculty of Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Plants 2021, 10(7), 1348;
Received: 21 May 2021 / Revised: 18 June 2021 / Accepted: 28 June 2021 / Published: 1 July 2021


When functioning properly, the stomach is the center of both physical and mental satisfaction. Gastrointestinal disorders, or malfunctioning of the stomach, due to infections caused by various biological entities and physiochemical abnormalities, are now widespread, with most of the diseases being inflammatory, which, depending on the position and degree of inflammation, have different names such as peptic or gastric ulcers, irritable bowel diseases, ulcerative colitis, and so on. While many synthetic drugs, such as non-steroidal anti-inflammatory drugs, are now extensively used to treat these diseases, their harmful and long-term side effects cannot be ignored. To treat these diseases safely and successfully, different potent medicinal plants and their active components are considered game-changers. In consideration of this, the present review aimed to reveal a general and comprehensive updated overview of the anti-ulcer and anti-inflammatory activities of medicinal plants. To emphasize the efficacy of the medicinal plants, various bioactive compounds from the plant extract, their experimental animal models, and clinical trials are depicted.

1. Introduction

For thousands of years, humans have been using medicinal plants, also referred to as healthy herbs, and have a long history of use in primitive medicines [1]. Traditional medicine prepared from these plants is still recognized as a preferred method in the health care system in many parts of the world because of its usefulness and affordability in the treatment of diseases [2]. The history of the Sumerian civilization first provided the instances of hundreds of medicinal herbs (e.g., opium), which were listed on clay tablets. Moreover, in 1550 B.C., the Egyptian Ebers Papyrus (an ancient medical document) depicted more than 882 herbal remedies of illness and injuries [3]. For many centuries, miscellaneous bioactive compounds emerging from the medicinal arbor have been used as a precursor to treating various diseases [4]. Owing to the existence of diversity, these organic molecules may be used as models for different synthetic drugs [5]. In addition, medicinal plants have justified their abilities to deal with several life-threatening diseases like cancer, hepatitis, and acquired immunodeficiency syndrome (AIDS) [6,7,8]. Hence, drug researchers are investigating the abundant curing substances found in nature using ethnobotany and have succeeded in discovering hundreds of pioneer compounds and drugs like aspirin, digoxin, quinine, and opium. The four major branches of phytochemicals include alkaloids, glycosides, polyphenols, and terpenes [9]. The widespread use of bioactive compounds is now evident in various applied branches of science such as agrochemicals, geo-medicine, modern pharmacology, plant science, food industry, cosmetics, and nano-bioscience [10].
In developing and underdeveloped societies, plant medicines are preferred over modern synthetic medicines due to their easy availability and affordability [11]. Moreover, the demand for plant-originated products is growing throughout the world. More than 85% of people in Asia, Africa, Latin America, the Middle East, and approximately 100 million people in the European Union rely on traditional herbal medicine for health issues. Approximately 90% of people in certain countries still practice in, and use, plant-based medicines [12]. Although the regulations of these conventional medicines are very limited in many countries of the world, the World Health Organization (WHO) has developed a web-based network to ensure its safe and rational use [13]. Due to the role of medicinal plants in the development of powerful therapeutic agents, over 1.5 million practitioners of the traditional medicinal system are using medicinal plants in preventive, promotional, and curative applications [14]. In Europe, it is estimated that the demand for the phytochemical and plant extract-based market has grown from $833.7 million in 2014 to $1.25 billion in 2019, which also indicates the current situation of plant-based consumers’ health awareness in the country [15].
Ulcers and different inflammatory diseases of the gastrointestinal tract are very much in need of effective therapeutic methods, since many individuals, regardless of age and gender, are still victims of these inflammatory diseases and remain under continuous medication without any hope of permanent recovery. Many chemically synthesized drugs are now being used to treat ulcers; however, they leave a range of side effects in the long run. For example, non-steroidal anti-inflammatory drugs (NSAIDs) are widely used in the treatment of inflammatory diseases, which may raise the risk of blood clotting that results in heart attacks and strokes. Therefore, the search for plant-mediated drugs is intended to counter these harmful diseases [16,17,18]. More specifically, anti-inflammatory drugs extracted from plants are being considered [19]. In addition, the application of herbal therapy to treat inflammatory bowel disease (IBD) is preferred worldwide because of its effectiveness and safety, although the relevant clinical trials are relatively limited to date [20]. Drugs such as amino-salicylates, corticosteroids, and immune-modulators are used in the treatment of ulcerative colitis, however, medicinal plants may be an effective and safe alternative to such medications [21].
The encouraging and ensuring health benefits of various clinical trials increased the acceptance of plant medicines among common people. Further research and investigations into the diverse active components of herbs and their clinical roles will illuminate and instigate the therapeutic use of plant-based medicines in the future [22]. This review focuses on supporting the therapeutic use of medicinal plants available in Bangladesh in the treatment of various inflammatory diseases of the gastrointestinal tract. Here, we have considered and reviewed the published articles using the keywords: medicinal plants, bioactive compounds, ulcers, inflammation, anti-ulcers, and anti-inflammatory diseases since 2000, from different databases like PubMed ( (accessed on 21 May 2021), Scopus Database ( (accessed on 21 May 2021), and Google Scholar ( (accessed on 21 May 2021). The research findings of relevant medicinal plants, native or cultivated, in Bangladesh were taken into consideration.

2. Inflammatory Diseases and Ulcers

Inflammation is a natural reaction in the defense of tissues against various injuries caused by physical stress combined with harmful chemicals or microbes [23]. Inflammation tends to be one of the prime causes for the occurrence of various diseases such as cancer, obesity, cardiovascular disease, rheumatoid arthritis, osteoporosis, asthma, IBD, central nervous system (CNS) depression, diabetes, and Parkinson disease [24]. Inflammation can be triggered by many stimuli including pathogens or cytokines (i.e., interleukin-6 or IL-6, tumor necrosis factor-alpha or TNF-α, neutrophils, and monocytes). These stimulating agents can be differentiated into macrophages, which are subsequently attracted to injured tissue sites by chemotaxis and intensify the inflammatory reactions to the damaged areas as well as initiate phagocytosis [25]. Inflammation can be characterized by swelling, joint pain, and redness. Inflammation leads to several chronic diseases including arthritis, autoimmune disease, coeliac disease, colitis, and asthma, which are often associated with the increased risk of development of cardiovascular diseases, diabetes, cancer, and osteoporosis [26]. Phytochemicals derived from medicinal plants can be used in the alleviation of inflammatory reactions by inhibiting different forms of enzymes e.g., lipoxygenase (LOX), cyclooxygenase (COX), phospholipase A2, and proteins (e.g., inhibition of the pro-inflammatory cytokines) [23]. In medical science, Crohn’s disease, and ulcerative colitis (UC) are two types of IBD that cause inflammation in the entire gastrointestinal tract and colonic mucosa, raising the risk of colon cancer as well [27].
An ulcer is the condition of corrosion in the linings of the stomach and the duodenum. Thus, ulcers in the gastrointestinal tract are subdivided into ulcerative colitis (lower) and peptic ulcers (upper) depending on the location of the infection [28,29]. Peptic ulcers, also known as gastric and duodenal ulcers, can be characterized as submucosal damage of the digestive tract caused by the disruption of the balance between the hostile factors (i.e., gastric acid, Helicobacter pylori, and anti-inflammatory drugs) and protective factors (i.e., mucus, bicarbonate, prostaglandins, and blood flow towards the mucosa) [30]. The common symptoms of peptic ulcers include a burning sensation and pain in the middle or upper stomach, bloating, heartburn, nausea or vomiting, and weight loss [31]. Excessive consumption of alcohol, smoking, chewing tobacco, serious illness, and the intake of NSAIDs increase the risk of ulcer development [28,32]. Gastric ulcers and duodenal ulcers, which are more prevalent in the Eastern and Western countries, cause morbidity and mortality worldwide [33], and H. pylori are considered as one of the most important factors in the development of this disease [34].

3. Plant Mediated Treatment of Ulcer and Inflammatory Diseases

Medicinal plants are the blessings of nature that humans have been using since prehistoric times as the precursor of most drugs. The treatment of ulcers and IBD is facilitated by the intensive use of many medicinal plants [35]. In addition, in recent years, numerous studies on plant extracts have substantially demonstrated anti-ulcer and anti-inflammatory activities in both in vitro and in vivo models.
Drugs derived from medicinal plants are effective against inflammation of the digestive tract primarily in two ways, either by reducing acid and pepsin secretion or by assisting the cytoprotection via mucosal defense factors [36]. The mode of action of these drugs differs according to their function. These medications maintain a balance between several aggressive factors (i.e., pepsin, acid, bile salts, and H. pylori) and defensive factors (i.e., cellular mucus, mucin secretion, mucosal blood flow, bicarbonate secretion, and cell turnover) [36,37]. For instance, the methanol extract of drumstick leaves, and flower buds inhibited aspirin-induced gastric lesion formation in rats [38]. It has been reported that several compounds, such as cavidine, chelerythrine, quercetin, hesperidin, α-pinene, and garcinol, present in medicinal plants were used against ulcer diseases [39]. Additionally, prominent anti-inflammatory compounds such as resveratrol, colchicine, epigallocatechin-3-gallate (EGCG) capsaicin, phytosterols, saponins, and curcumin derived from plants were used to treat inflammatory diseases [40,41].
In addition to the use of traditional medicines such as NSAIDs, the use of proton pump inhibitors (e.g., pantoprazole, omeprazole, lansoprazole, and rabeprazole), histamine receptor blockers (e.g., famotidine and ranitidine), synthetic prostaglandin E1 (e.g., misoprostol), antacids (e.g., aluminum hydroxide and magnesium trisilicate combination), corticosteroids (e.g., dexamethasone), immune-suppressants, immune-modulators (e.g., azathioprine and 6-mercapto-purine), antibiotics (e.g., clarithromycin and metronidazole), and biologic agents (e.g., TNF-α) for the treatment of inflammatory diseases is in practice on a large scale and has significant adverse and undesirable side effects including gastrointestinal and hepatic toxicity, renal and cardiovascular malfunctions, and hematologic effects such as hemophilia and thrombocytopenia [32,42,43,44,45]. As a result, the use of natural products such as plants and herbal derivatives is increasingly growing among ulcerated and inflammatory patients having minimal or no side effects as they are the products of nature. Different types of plants which are currently considered to be effective to treat ulcers and inflammatory diseases are discussed below:

3.1. Aegle marmelos

A. marmelos of the Rutaceae family is known most often as the ‘bael’ tree in subcontinent regions and as the ‘wood apple’ in other parts of the world [46,47]. All parts of this plant (leaf, root, seed, bark, and fruit) contain medicinal properties and have many active chemical constituents, such as flavonoids (e.g., flavone and rutin) [48,49], tannins (e.g., skimmianine) [50], phenylpropanoids (e.g., lignans and phenylpropenes) [51], saponins, luvangetin, coumarins (e.g., xanthotoxol, marmelosin, and scoparone) [52], carbohydrates (e.g., galactose, L-rahamanos, etc.), terpenoids, essential oils (e.g., phellandrene, limonene, ocimene, and pinene) [53], ester, and alkaloids (e.g., skimmiarepin and cinnamamide) [54,55]. The ripe and unripe fruits of this plant have historically been used in the treatment of ulcers, chronic diarrhea, dysentery, rectal inflammation, and certain cancers [56]. Additionally, leaves from A. marmelos soaked in water overnight can control peptic ulcers [37] and root decoction is used to treat fevers and colds [56].
Extensive experimental studies have demonstrated that A. marmelos may prevent ulcers and inflammation effectively. An aqueous extract of A. marmelos resulted in decreasing the ulcer score and ulcer index in rats’ stomachs, which was successfully achieved after the administration of 400 mg/kg of an aqueous extract from A. marmelos [57]. In other studies, ethanol, and an aqueous extract from A. marmelos, provided 56.33% and 37.2% protection of ulcers in vivo and the ethanol-induced gastric ulcer model, respectively, compared to standard drugs such as omeprazole (50.4% protection) (20 mg/kg body weight) [57,58]. Ramakrishna et al. investigated the effect of the oral administration of methanol extract from unripe A. marmelos in rats against H. pylori LPS-induced gastric ulcers which showed that this extract (500 mg/kg dose) caused a 93.98% reduction in the gastric ulcers [59]. This improvement in gastric ulcers was due to the inhibition of parameters of gastric secretion, including free and total acidity, pepsin concentration, acid release, and the volume of gastric juice [59]. Similarly, from another study, the extract from the unripe fruit of A. marmelos at a dose of 50 and 100 mg/kg (intraperitoneal injection) also exhibited gastro-protective action against ethanol-induced gastric mucosal damage [60]. These findings suggest that the A. marmelos and the active compounds in it trigger the prostaglandin-independent pathway as a gastro-protective mechanism. Bioactive compounds exerting the gastro-protective properties were not specifically investigated, but the major compounds like eugenol, luvangetin, marmin, marmelosin, mucilage, aegelin, dictamine, and auroptene might trigger gastro-protective activities [59,61,62]. Marmelosin (molecular formula C16H14O4) (Figure 1) showed the ability to fight against cellular and DNA damage which are vital events that trigger inflammation. Moreover, the downregulation of the pro-inflammatory marker (TNF-α) and the transcription factor (NFĸB) by marmelosin inhibits chronic inflammation in cancer [63]. Eugenol (molecular formula C10H12O2) (Figure 1), another major bioactive compound of A. marmelos, can help to cure ulcers as it is significantly effective in reducing myeloperoxidase (MPO) activity, which is responsible for the neutrophilic infiltration during ulcer formation [64]. Moreover, eugenol inhibits the production of superoxide anion by neutrophils which results in the reduction of MPO substrates, hydrogen peroxides, and ultimately triggers the decline of MPO activity in neutrophils [65].

3.2. Aloe vera

A. vera from Liliaceae is known as ‘ghritkumari’ in Bangladesh and India, and ‘Aloe vera’ worldwide [66]. The leaves, mainly, of A. vera have great medicinal importance as they have active chemical compounds such as saponins, essential amino acids (e.g., cysteine, alanin, arginine, and histidine); anthraquinones (e.g., aloetic acid, aloin A and B (or collectively known as barbaloin), anthracine, anthranon, emodin, etc.); enzymes (e.g., alkaline phosphotase, amylase, catalase, cellulase, cyclooxidase, and lipase); hormones (e.g., auxin and gibberllins); chromones, lignin, minerals, salicylic acid, sterols, carbohydrates (e.g., lignins and sugars); dietary fibers, protein, organic acids, lipids, and vitamins [67]. For the treatment of ulcers, rural people take the inner gel layer of fleshy leaves orally with water [68]. This plant has great potential for curing and preventing gastric ulcers by stimulating its anti-inflammatory and healing function and by regulating the mucus and gastric secretion [69]. A. vera can successfully treat various illnesses and conditions including duodenal ulcers, peptic ulcers, mouth ulcers, and sore throats [70]. A. vera, coupled with silver nanoparticles, was effective for ulcer healing by their anti-inflammatory enhanced re-epithelialization as well as fibroblast activation effects [71]. A. vera extract pre-treated animals (dose of 200 mg/kg bwt for five days) had reduced signs of mucosal injury relative to untreated controls, although the incidence was not as high as in omeprazole-treated rats [72]. On the contrary, A. vera extract pre-treatment was ineffective against gastric lesion formation [73]. Furthermore, the extract of A. vera has been shown to cause dose-dependent amelioration in the severity, as well as incidence, of acetic acid-induced gastric lesions when used as a preventive measure in rats [74]. Aloin A and B (molecular formula: C21H22O9), collectively known as barbaloin (Figure 1), is considered one of the prominent constituents isolated from A. vera which showed potency to treat ulcers and inflammatory diseases [75]. To treat ulcerative colitis, barbaloin effectively increases the mRNA expression of IL-4 and IL-10 in tissues and simultaneously decreases the expression of IFN-γ, IL-6, IL-1β, and TNF-α [76]. Furthermore, barbaloin can prevent the ulcer-mediated myosin light chain kinase (MLCK) signaling pathway by activating the 5’ adenosine monophosphate-activated protein kinase (AMPK) signaling pathway.

3.3. Alpinia nigra and A. species

The decocted roots of A. nigra (Zingiberaceae family), locally known as ‘bhulchengi’ or ‘khetranga’, are used as a treatment of gastric ulcers [77]. Natural bioactive compounds as well as crude hydroalcoholic fractions isolated from the Alpinia spp. exhibits anti-inflammatory and analgesic activities. Hydroalcoholic and aqueous extracts from the rhizomes and leaves of different Alpinia spp. have bioactive components with anti-nociceptive and anti-allergic characteristics [78]. Recently, platelet-activating factor antagonists, named diarylheptanoids, have been reported from Alpinia officinarum rhizome extract [79], which also exhibited analgesic actions with 80% ethanoic extract [80]. Fruit extract of A. nigra at a concentration of 250 mg/kg and 500 mg/kg exhibited dose-dependent potential against inflammatory paw edema induced by carrageenan. These healing properties may be due to the existence of a large amount of terpenoid, tannins, alkaloids, and flavonoids [81]. Diarylheptanoid, flavonoids, and some volatile oils (e.g., cineole alpha-pinene, sesquiterpene, linalool, lactones) which are the major bioactive components isolated from Alpinia species have several biological activities including anti-oxidant and anti-cancerous due to the presence of functional aldehyde (–CHO) and keto (C=O) groups in their structure [82].

3.4. Annona squamosa

A. squamosa of the Annonaceae family is generally referred to as the ‘custard apple’ [83]. Based on the phytochemical analysis, alkaloids, total phenolic compounds (TPCs), including flavonoids, saponins, tannins, and phenols, are most abundant in Annona squamosa. It has been reported that these phenolic compounds have regulatory effects on several physiological and biochemical processes (e.g., signal transduction pathways, cell proliferation, enzymatic activity, and cellular redox potential) to cure chronic diseases [84]. The bark, leaves, stems, roots, seeds, and fruits of A. squamoza contain active alkaloid compounds (e.g., annosqualine, dihydrosinapoyltyramine, and liriodenin) [85]; sugar (e.g., quercetin-3-O-glucosid) [86]; phenolics, flavonoids, and tocopherol [87]; acetogenins (e.g., squamostatins, squamoxinone, mosinone, and bullacin) [88], essential oils rich in ent-kaurane type diterpenoids and sequeterpenes (e.g., β-caryophyllene, and β-cedrene) [88].
A. squamoza had anti-tumor, anti-oxidant, anti-diabetic, anti-lipidimic, anti-ulcer, and anti-inflammatory properties due to its cyclic peptide contents [89]. In this phytochemical and in vivo pharmacological research, twelve known compounds were isolated and, among them, 1-(4-β-d-glucopyranosyloxyphenyl)-2-(β-d-glucopyranosyloxy)-ethane was isolated from natural sources for the first time. It has been shown that some isolated compounds provided gastroprotection through the inhibition of H+ K+-ATPase (proton pump) activity and the boosting of the mucosal defense mechanism simultaneously. A. squamosa leaves have been shown to have substantial analgesic as well as anti-inflammatory activities compared to synthetic drugs such as aceclofenac and pentozocine, indicating a mixed central as well as a peripheral mechanism for its effectiveness [90]. Additionally, the literature suggested that leaf extract of A. squamosa has both thyroid inhibitory and anti-peroxidative properties [91], which are also beneficial during the proper functioning of lipid and carbohydrate metabolism [92].

3.5. Anthocephalus cadamba

Various parts of A. cadamba (Family: Rubiaceae) are used in the treatment of numerous conventional health problems, including mouth ulcers, stomatitis, subdermal inflammatory deposits, and gastric disturbances [93]. The anti-ulcer action of methanolic and aqueous extracts of A. cadamba bark and leaves were examined in both aspirin-induced and pylorus-ligation ulcer models [94]. At oral doses of 200 and 400 mg/kg, both extracts demonstrated the substantial inhibition of gastric lesion in aspirin-induced gastric ulcers and pylorus ligation-induced ulcers. At the same time, the extracts also exhibited a significant decrease in gastric volume, free acidity, pH, total acidity, ulcer inhibition, as well as ulcer index [94]. The gastro-protective efficacy of A. cadamba was investigated in an in vivo mice study showing the ethanolic extract of A. cadamba at two doses of 250 and 500 mg/kg substantially decreased ulceration caused by both HCl and ethanol-dependent doses [95]. Similarly, in another report, the defatted aqueous extract of the leaves of this plant showed substantial analgesic and anti-inflammatory activities at different doses at 50, 100, 300, and 500 mg/kg [96,97]. In addition, the methanol extract of the A. cadamba bark has also been successfully assessed for antipyretic, analgesic, and anti-inflammatory actions by some researchers [98,99].

3.6. Aristolochia indica

This plant (family: Aristolochiaceae) has been applied against both ulcers and anti-inflammatory diseases and so on [100]. Aristolochic acids and esters, aristolactams, terpenoids, and flavonoids are the major groups of phytoconstituents that are common in all species of Aristolochia including Aristolochia indica. Among them, aristolactams (molecular formula: C17H11NO4) (Figure 1) are synthesized as biogenetic intermediates which are normally supposed to be generated from the reduction products of aristolochic acids through the cyclization condensation reaction. From the Aristolochia species, twelve aristolactams have been reported, and among them, there were also six compounds having the 3,4-methylenedioxy substitution groups [101]. Anti-inflammatory effects of the isolated compounds aristolactam I and hinokinin from A. indica have been reported against TNF-α and IL-6 respectively [102]. (-) Hinokinin exhibited its anti-inflammatory effects through the nuclear factor kappa-light-chain-enhancer of the activated B cells (NF-κB) dependent mechanism whereas aristolactam I followed the NF-κB independent mechanism. The ethanol extract of the root bark of A. indica successfully inhibited inflammatory activity induced by a hyposensitive agent, named “compound 48/80” (a condensation product of N-methoxyphenethylamine and formaldehyde), which has an almost identical inhibitory pattern of synthetic anti-inflammatory drugs such as ketotifen fumarate [103].

3.7. Artocarpus heterophyllus

A. heterophyllus Lam. from the Moraceae family is locally called ‘kanthal’. The leaf ash is taken orally to treat ulcers and young leaves in combination with roots are often beneficial for skin problems, respiratory diseases, and diarrhea (oral medication) [104]. The methanolic extract of A. heterophyllus at a concentration of 500 mg/kg inhibited the indomethacin-induced gastric ulceration, decreased gastric acid concentration, and increased gastric pH concentration [105]. In another experiment, the natural phenolic compound Moracin-C (molecular formula: C19H18O4) (Figure 1) was isolated from A. heterophyllus, and has been proven to have considerable anti-inflammatory effects by blocking the release of lipopolysaccharide (LPS), activated nitric oxide (NO), and reactive oxygen species (ROS) without showing detectable cytotoxicity [106]. Moreover, the compound Moracin-C significantly decreased LPS-stimulated mRNA up-regulation and protein expression of inducible cyclooxygenase-2 (COX-2), nitric oxide synthase (iNOS), and several pro-inflammatory cytokines (e.g., IL-1, IL-6, and TNF-α). The anti-inflammatory activity of Moracin-C was linked with the activation of the mitogen-activated protein kinases (e.g., p38, ERK, and JNK) as well as NF-κB pathways by decreasing the nuclear translocation of NF-κB p65 subunit as observed by confocal microscopy and nuclear separation experiment [106].

3.8. Asparagus racemosus

The A. racemosus of the Liliaceae family is locally known as ‘shatamuli’ in Bangladesh and ‘climbing asparagus’ all over the world [107,108]. Different parts of A. racemosus contain different bioactive compounds such as steroidal glycosides, steroidal saponins (e.g., shatavarin I, shatavarin IV); flavonoids (e.g., 8-methoxy-5, 6, 4′- trihydroxyisoflavone); alkaloids (e.g., asparagamine A); asparagamine, racemosol, beta-sitosterol, stigmasterol, genistein, and daidzein [108,109,110,111]. The plant, particularly its root, has been shown to have anti-ulcerogenic, adaptogenic, anti-oxidant, and anti-dyspepsia activities [112]. The in vivo research indicated the inhibitory effect of A. racemosus on gastric hydrochloric acid secretion that protects gastric mucosal damage [113]. In addition, the reduction in ulcer index using the raw extract of A. racemosus (100 mg/kg/day orally) was comparable to the antiulcer drug ranitidine (30 mg/kg/day orally). The bioactive compound, shatavarin (steroidal saponin), isolated from A. racemosus, acts spontaneously in the treatment of ulcers in a chemically-induced ulcer model by increasing the mucin secretion inside the gastrointestinal tract [114].

3.9. Beta vulgaris

B. vulgaris of the Chenopodiaceae family is generally referred to as ‘beetroot’ or ‘sugar beet’, widely used as a vegetable or as a salad [115]. The root decoction along with a small amount of vinegar is traditionally used for the treatment of ulcers and sores. The alcoholic root extract of B. vulgaris at a concentration of 200–400 mg/kg significantly decreased the ulcer index, ulcer score, total acidity, and maintains normal mucosa in pylorus ligation and ethanol-induced ulcer in rat models [116,117]. The active constituents in B. vulgaris are polyphenols, tannins, alkaloids, vitamins (e.g., C, B3, B6, B9), carotenoids, flavonoids, betacyanins, betaxanthins, betanin, and saponins, most likely have inhibitory effects on gastric mucosal injury [116,118,119]. Betalains (molecular formula: C24H26N2O13) (Figure 1), nitrogenous water-soluble compounds, are abundant in B. vulgaris which have strong therapeutic activity against inflammatory diseases. This phenolic chromoalkaloid synthesized from the amino acid tyrosine is used as food additives due to its high solubility and lack of toxicity [120]. Pre-treatment with petroleum ether extract of B. vulgaris L. gave significant defense against aspirin-induced gastric ulcers [121]. The anti-ulcer effects are likely due to the existence of steroids or phenols in the extract. Moreover, there are significant anti-inflammatory properties in the aqueous extract of B. vulgaris which was also investigated against the carrageenan-induced edema in rats [122].

3.10. Bombax ceiba

The plant B. ceiba is under the family Bombacaceae and has several medicinal properties against inflammatory diseases, such as cancer, dysentery, ulcer, and microbial infections [123]. Bark, latex, leaf, flower, seed, stem, rhizomes, thorn, stem bark, fruit, and heartwood are the medicinally active parts of B. ceiba which contain common flavonoids (e.g., isovitexin (molecular formula: C21H20O10) (Figure 1), kaempferol 3-O-galactoside (molecular formula: C21H20O11) (Figure 1), gallic acid (molecular formula: C7H6O5) (Figure 1)), quercetin, lupeol, tannic acid, sesquiterpenoids, naphthol, naphthoquinones, polysaccharides, anthocyanins, shamimin, lupeol, and alkaloids [123,124]. The young root paste of this plant is traditionally used in the treatment of gynecological disorders, constipation, diarrhea, piles, dysentery, wounds, ulcer, inflammation, and urinary diseases [124,125]. Crude plant extracts demonstrated strong analgesic efficacy in acetic acid-induced writhing as well as hot plate tests in mice [126]. Using naloxone, B. ceiba extract-induced analgesia was independent of the opioid receptor; where, mangiferin exhibited significant interaction with the receptor at a peripheral site, with a minor contribution at the neuronal stage [126]. This plant is known to have large amounts of gallic and tannic acids that act as astringents precipitating proteins that help to regenerate the damaged epithelial mucosal lining of the ulcerated lesion [127,128]. Similarly, B. ceiba effectively decreased the ulcer index after administration of flower extract (300 mg/kg/day) for seven days, and suppressed gastric inflammation by inhibiting TNF-α and interleukin 1β (IL-1β) [129].

3.11. Caesalpinia pulcherrima

C. pulcherrima of the family Fabaceae or Leguminosae is locally known as ‘krishnachura’ in Bangladesh and as ‘peacock flower’ worldwide [130]. Various medicinally active vegetative sections of this plant including young leaves, bark, fruit, seed, stem, flower, and whole plant are considered as a storehouse of different bioactive compounds such as sterols (e.g., β-sitosterol), flavonoids (e.g., flavones, isoflavones, flavanols chalcones, rotenoids), glycosides, organic compounds (e.g., α-phellandrene), essential oils (e.g., β-caryophyllene, γ-Terpinene), and carotenoids (e.g., lutein, zeaxanthin), etc. [130,131,132]. Traditionally, the extracts of this plant have been used to treat various diseases such as malaria, diarrhea, dysentery, fungal infections, respiratory diseases, inflammatory diseases, and microbial diseases [132]. The gastroprotective ability of galactomannan extracted from the seeds of C. pulcherrima L. (GM-CP) was assessed in indomethacin induced acute gastritis model, which showed that GM-CP (10 mg/kg dose) decreased the severity of macroscopic lesion as well as the loss of superficial cells through ameliorating inflammatory symptoms including neutrophil infiltration, production of TNF-α, thiobarbituric acid, reactive species migration, and adhesion of mesenteric leukocytes [133]. Sharma and Rajani have assessed the anti-inflammatory and anti-ulcer efficacy of C. pulcherrima in indomethacin induced cotton pellet granuloma and both aspirin and pylorus-ligation-induced ulcer models respectively [134].

3.12. Calendula officinalis

C. officinalis L. (family: Asteraceae) is popular with the name ‘gada ful’ to Bangladeshi people. The petals are orally administered in the treatment of stomach pain, inflammation, and ulcers [135]. The extract of C. officinalis had both antacid property and gastroprotective capacity. Significant gastro-curative efficacy of the extract was investigated against absolute ethanol and indomethacin induced ulcerative lesion in rats [136]. Another study also confirmed the presence of gastroprotective properties in the plant extract of C. officinalis resulting in the substantial inhibition of the ulcer development caused by chemical and physical agents with 87.15% utmost therapeutic efficiency (450 mg/kg bwt) in cold-resistant and stress-induced ulcers [137]. The findings from lipid peroxidation and enzyme assay clearly exhibited the antioxidant effect of the whole plant of C. officinalis on the ulcer condition. Likewise, the ethanolic extract of C. officinalis in mice showed substantial anti-inflammatory properties against carrageenan as well as dextran–induced paw edema [138]. The extracts substantially inhibited enhanced extents of pro-inflammatory cytokines (e.g., IL-6, IL-1β, TNF-α, IFN-γ) and acute-phase protein, C-reactive protein (CRP), in mice generated by LPS injection. The extract also inhibited LPS-induced COX-2 levels in the spleen of mice. The findings demonstrated that potential anti-inflammatory activities of C. officinalis extract may be mediated by inhibiting pro-inflammatory cytokines as well as COX-2, and subsequent prostaglandin synthesis [138].

3.13. Calotropis procera

C. procera of the Asclepiadaecae family is popularly termed ‘akanda’ in Bangladesh and ‘milkweed’ worldwide [139]. The leaf, flower, flower bud, latex, root bark, and root of this plant contain different bioactive compounds such as triterpenoids, lupeol, flavonoids, flavanols, glycosides, resins, cardenolides, mudarine, anthocyanins, α-amyrin, β-amyrin, calactin, calotropin, and β-sitosterol. Bioactive compounds from C. procera show protective properties against different diseases [139,140]. Traditionally, the latex is used in reducing toothache [141], in the treatment of vertigo, paralysis, hair loss, baldness, and rheumatoid/joint swellings. In addition, the leaves have therapeutic values to reduce swelling as well as to treat joint pain. The bark is used in the treatment of eczema, leprosy, and elephantiasis treatment [142].
Different parts of C. procera show anti-inflammatory and gastroprotective properties. The leaves and bark of C. procera have curative properties for ulcers and stomach aches. The anti-ulcer efficacy of C. procera extract was determined in white albino rats [143]. The extract significantly reduced the ulcer index, ulcer lesion score, leukocyte infiltration in the gastric epithelial lining, and ameliorated the congestion and necrosis. The anti-ulcer property of the plant was mainly due to the presence of different phyto-constituents like polyphenols, flavonoid and lignin glycoside triterpenoids, tannins, and steroids [144]. In the treatment of ulcerative colitis, colitic rats treated with the methanol extract of dried latex of C. procera (MeDL), demonstrated a significant reduction of colonic mucosal damage. This reduction resulted from the inhibition of oxidative stress and pro-inflammatory signaling proposes C. procera as a promising therapeutic plant to treat inflammatory conditions in the colon [145]. From this study, it was proposed that targeting oxidative stress and NFκB (p65) regulated pro-inflammatory signaling could be a potential approach for providing protection in the treatment of colitis.

3.14. Camellia sinensis

C. sinensis of the Theaceae family is locally termed as ‘cha’ in Bangladesh and as ‘black tea’ worldwide [146]. The leaves, stems, and twigs contain different active constituents like flavonoids (e.g., thearubigins, theaflavins, and catechins), vitamins amino acids, β-carotene, chlorogenic acids, volatile compounds carbohydrates, phenolic acids (e.g., gallic acid, caffeic acid, and cauramic acid), proteins, lipids, and fluoride [147,148]. These components help in the treatment of different diseases with their different protective properties [146]. This plant is traditionally used in the treatment of flatulence, digestion, vomiting, diarrhea, maintaining body temperature, blood sugar, and in the alleviation of stomach discomfort [149,150]. Heteropolysaccharides extracted from C. sinensis exerted gastroprotective properties by reducing ethanol-induced gastric lesions [151]. Moreover, it was also found effective in gastroprotection by gastric mucus maintenance and decreased glutathione levels [151].
Theaflavin (molecular formula: C29H24O12) (Figure 1), a major active component of black tea, showed the potency for the healing of indomethacin-mediated gastric ulcers by the synthesis of PGE2, revealing antioxidative aspects and intensification of mucin secretion [152]. This polyphelnolic compound also triggers the suppression of several inflammatory modulators in the ulcer margin and induces iNOS modulation for gastric ulcer healing [153]. Catechin (molecular formula: C15H14O6) (Figure 1), especially epigallocatechin-3-gallate (EGCG) (molecular formula: C22H18O11) (Figure 1), is the major bioactive polyphenol compound of C. sinensis and showed strong antagonistic activity against inflammatory respiratory infections in humans caused by Stenotrophomonas maltophilia [154]. This compound inhibits the enzyme dihydrofolate reductase of S. maltophilia, which is considered an attractive target for the development of antibacterial molecules [155]. Green tea catechins inhibited TNF synthesis in a murine model of inflammatory arthritis and reduced inflammation as well as slowed down cartilage breakdown [156].

3.15. Capsicum annuum and C. frutescens

C. annuum and C. frutescens from the Solanaceae family are known as ’chili’, ‘pepper’ or simply “capsicum” worldwide, contains different active constituents like solasonine, capsacin, acyclic diterpene glycosides, and capsidiol [130,157]. The fruit is used locally as a spice, which shows potent anti-ulcer and antioxidant properties. It also helps prevent type-2 diabetes [130,157]. The fruit of C. frutescens was taken to treat gastric disorders and ulcers [158]. At doses of 300 and 600 mg/kg body weight, the aqueous extract of the chili pepper (C. frutescens) reduced the gastric ulcer length of aspirin-induced ulcer in experimental rats, which proved the curing properties of the extract of C. frutescen [159]. Capsaicin (molecular formula: C18H27NO3) (Figure 1) is the major bioactive component of these plants, exhibits anti-inflammatory characteristics [160,161]. This secondary metabolite of Capsicum spp. is also known as capsaicinoid due to their alkaloid nature. Researchers assessed the impact of capsaicin on the mucosa of the stomach, pro-inflammatory cytokines (e.g., TNF-α, IL-6, IL-1β), and COX-2 in gastric mucosa in two experimental models. Histopathological examinations coupled with molecular studies of stomach samples revealed a protective action of gastric mucosa along with a substantial reduction of pro-inflammatory cytokines as well as COX-2 in both experimental models [160].

3.16. Carica papaya

C. papaya of the Caricaceae family is commonly known as ‘papaya’ [162]. C. papaya contains diverse active constituents like enzymes (e.g., papain, chemopapain, chymopapain, peptidase, lysosome, and myrosine), proteins, fats (e.g., myristic, palmitic, stearic, and linoleic), carbohydrates (e.g., glucose, fructose, galactose, and xylitol), minerals, vitamins, volatile compounds, alkaloids (e.g., carpain, pseudocarpain, choline, and caproside), glycosides, and carotenoids [163,164]. The most common and significant constituent, papain, is a papaya proteinase I (cysteine protease) enzyme which has several therapeutic effects particularly in inflammation and gastrointestinal disorders. Traditionally, the decoctions of leaves and dried flowers were used as anti-anemic agents, blood purifiers, and in several diseases [164,165,166]. Fruits are used to treat impotence and ulcer. The crude latex decoction is used to treat anthelmintic, dyspepsia, burns pain, bleeding hemorrhoids, stomachic, and diarrhea [167].

3.17. Cinnamomum cassia

C. cassia of the Lauraceae family is commonly known as ‘daruchini’ in Bangladesh and as ‘cinnamon’ worldwide. The bark of cinnamon contains different active constituents such as terpenoids, phenylpropanoids, glycosides, cinnamaldehyde, cinnamic acid, cinnamate, and numerous essential oils (e.g., trans-cinnamaldehyde, cinnamyl acetate, eugenol, L-borneol), etc. [168]. The C. cassia plant is traditionally used as a spice and cures dental problems, prevents colon cancer, and acts as a coagulant to prevent bleeding [169]. It performs different anti-inflammatory activities [168,169,170]. Cinnamaldehyde (molecular formula: C9H8O) (Figure 1), the most abundant phytocomponents of C. cassia, was active as an anti-inflammatory agent in gastric inflammation. This aromatic aldehyde compound inhibited IL-8 secretion/expression and the nuclear factor kappa B (NF-κB) pathway to treat Helicobacter pylori-induced gastric inflammation [171].

3.18. Chromolaena odorata L.

C. odorata, which is commonly known as ‘germany lata’ in Bangladesh, is a member of the Asteraceae family. Several chemical constituents including flavonoids, alkaloids, triterpenes/steroids, monoterpenes, and phenolic acids can play significant roles in treating inflammatory and ulcer diseases [172]. The plant has been grown in bushy areas, forest zones, and roadsides. The leaf extract of this plant with salt has been used as an oral medicine in the tropical areas of Bangladesh to get rid of ulcers [173]. The ethanol-induced gastric lesion was successfully minimized by applying the extract of C. odorata L. Also, C. odorata extract was effective in arresting internal bleeding due to the presence of polyphenols [174].

3.19. Curcuma longa L.

C. longa L. of the Zingiberaceae family is locally known as ‘halud’ in Bangladesh and India and commonly termed as ‘turmeric’ worldwide [175]. The rhizome and leaves of C. longa contain many active constituents such as alkaloids, phenolic compounds (e.g., isoflavone, diarylheptanoids curcuminoids, diyrenphenate), alcohols, essential oils (e.g., monoterpenes, sesquiterpenes, diterpenes, and triterpenoids), ketones, ß-turmerone, α-turmerone, steroids (e.g., β-sitosterol), and aldehydes [176,177,178]. Traditionally, this plant has been used to cure dermatitis, cancer, leprosy, hemorrhoids, inflammation, and asthma, and shows hepato-protective activity [179,180]. Based on its antioxidant property, curcumin (molecular formula: C21H20O6) (Figure 1), also known as diferuloylmethane, an active component of C. longa, scavenges ROS and regulates matrix metallopeptidases (MMPs) activity to induce antiulcer activity [181,182]. Beside this, curcumin also exerted different pharmacological effects including anti-inflammatory activity triggered by suppression of PG synthesis [183,184]. It is reported that the substitution group on the methoxy position draws a vital contribution in the anti-inflammatory effects of curcumin [185]. In a transgenic mice model, it was shown that phytosomal curcumin exerted strong effects on the activation of anti-inflammatory PPARγ (peroxisome proliferator-activated receptor γ) as well as the inhibition of pro-inflammatory NF-κB, therefore, it could be used in the treatment of patients with chronic hepatitis B infection [186]. The application of the paste of the rhizome is carried out on injuries, strains, and wounds externally as the primary treatment. The leaves are also used in malaria and jaundice treatment and during pregnancy [187,188]. From the findings of phase-I clinical trials and toxicology studies conducted by Anand et al., it was concluded that curcumin is safe and tolerated even at very high doses (12 g/day) in humans [189]. A joint report from the World Health Organization (WHO) and the Food and Agriculture Organization (FAO) has recommended that a high intake of curcumin at a concentration of 0-1 mg/kg body weight per day had no adverse health effects on the human body [178].

3.20. Glycyrrhiza glabra

G. glabra (family: Fabaceae) has been reported to treat gastric ulcers, oral ulcers, as well as ulcerative colitis [190]. Although the powder form of G. glabra is commonly used to treat cough, gastric pain, and vomiting tendency [191], however, the extract of G. glabra L also has healing properties against gastric ulcer lesion, caused by indomethacin and HCl/Ethanol, in a dose-dependent manner [192]. It has been reported that root of G. glabra, also known as licorice or liquorice, derived compounds stimulate the mucus secretion from the stomach, expand the life span of the surface cell of the stomach, and enhance the prostaglandin level which eventually lead to ulcer healing [193]. According to recent studies, the most important bioactive compounds in licorice are flavonoids, triterpenes, and polysaccharides [194]. Glycyrrhizin (molecular formula: C42H62O16) (Figure 1), the major bioactive compound of G. glabra, is effective against inflammation and ulcers [195,196]. This triterpenoid saponin-based compound has two isomers such as 18α-GL & 18β-GL and they have anti-fibrogenic properties [197]. Due to the probable antioxidant effect, extracts of licorice had a healing capacity in gastrointestinal ulceration. In the early 1960s, a succinate derivative of glycerrhetinic acid called carbenoxolone (molecular formula: C34H50O7) (Figure 1) was developed in London as an antiulcer drug and was used to assist in the healing of ulcers as the preferred form of licorice [198]. It is determined that G. glabra can increase superoxide dismutase effectively as an enzymatic defense system to treat ulcerative colitis induced by acetic acid. Moreover, it played a crucial role in diminishing the levels of NO, TNF-α, and IL-6 in a dose-dependent manner [199]. Anti-inflammatory mechanisms of licorice and G. glabra include four major factors: prostaglandin E2 (PGE2), TNF, MMPs, and free radicals (including reactive oxygen, and nitrogen species) were reported based on previous several studies [190].

3.21. Hibiscus rosa-sinensis

H. rosa-sinensis (family: Malvaceae) is locally known as ‘joba’ in Bangladesh and commonly known as ‘China rose’ worldwide [200]. The root, leaf, and flower of H. rosa-sinensis contains different active constituents such as tannins, steroids, anthraquinones, essential oils, quinines, mucilage, phenols, reducing sugars, flavonoids, carbohydrates, free amino acids, alkaloids, proteins, terpenoids, cardiac glycosides, and saponins [200]. Traditionally, the root of the plant is used for treating ulcers. The administration of aqueous flower extract from this plant (250 mg/kg) revealed gastric ulcer suppressive activity against pylorus-ligation, aspirin-induced, and ethanol-induced ulcers in vivo and this protective activity occurred due to the presence of flavonoids and tannins as free radical quenchers [201]. Fruits are used externally to cure sprains, wounds, and ulcers [200,202,203].

3.22. Centella asiatica

C. asiatica of the Umbelliferae family is locally known as ‘thankunipata’ in Bangladesh and as ‘Indian pennywort’ worldwide. It originates from the wetlands of Asia [204]. The paste of the leaves of C. asiatica is locally used for ulcers and different gastric disorders. Traditionally, this plant has been used to treat diarrhea, rheumatism, skin diseases, syphilis, and inflammation. Several main components i.e., madecassoside, madecassic acid, asiaticoside, and asiatic acid, present in C. asiatica were extensively studied for therapeutic purposes including ulcers and inflammatory diseases [205]. Asiaticoside (molecular formula: C48H78O19) (Figure 1), a major active constituent of C. asiatica, plays an important role in healing gastric ulcers [204]. Asiaticoside is a glycoside compound that belongs to the triterpenoid group [206]. Acetic acid-induced gastric ulcers in rats were reduced with a lower lesion score, minimized ulcer size, and reduced or absent leucocytes infiltration and submucosal edema, when the plant extract was administered orally. Rats pre-treated with leaf extract exhibited comparatively better protection of the gastric mucosa and had cytoprotective effects [207,208].

3.23. Lagenaria siceraria

L. siceraria of the Cucurbitaceae family is commonly known as ‘bottle gourd’. The fruits, leaves, roots, and seeds of L. siceraria contain different active constituents such as vitamin B, amino acids, and ascorbic acid (vitamin C) [157,209]. The leaves are cooked and taken by women as a potherb and to relieve the pain during menstruation. The syrups from the fruits are also used to treat bronchial abnormalities like pectoral cough, asthma, etc. [210,211]. The extract of L. siceraria has both strong anti-ulcer and antioxidant activities, though the molecular mechanisms of both anti-ulcer and anti-oxidant activities were not investigated [212]. However, the doses of 250 and 400 mg/kg were safe as there was no indications of signs of toxicity or mortality [212]. From another study, a dose up to 1000 mg/kg could be safe after the repeated administration of methanolic extract of L. siceraria fruit for 28 days [213].

3.24. Mangifera indica

M. indica of the Anacardiaceae family is commonly known as the ‘mango’ tree [214]. The fruits, stem barks, heartwoods, leaves, and roots of the plant contain active constituents like triterpenoids, polyphenolics (e.g., mangiferin aglycone), sterols (e.g., mangsterol), alkaloids, saponins, tannins and flavonoids (e.g., mangiferin, mangostin, 29-hydroxy mangiferonic), essential oils (e.g., nerol, elemene, linalool, humulene, ocimene), vitamin A, vitamin C, xanthophylls, and β-carotenes [214]. The leaf extract of M. indica, along with rice bran oil, is used traditionally for the treatment of ulcers. The young leaves are also capable of curing dysentery. The seed pulp, along with cornflour, can control diabetes. The extracts of the leaves of the mango plant decreased the ulcer index and showed antiulcer properties to fight against in vivo aspirin-induced gastric ulcer [215,216]. The ripe mango juice is used to tackle heat stroke, which is a fatal life-threatening inflammatory response [217]. The extract from the bark can treat fever, cold, and vomiting [218].

3.25. Mimosa pudica

M. pudica of the Fabaceae family is locally known as ‘lajjaboti’ in Bangladesh and is commonly known as ‘zombie’ or ‘shy plant’ worldwide. The leaf juice or whole plant decoction helps in treating urinary tract infection, dysentery, pain in the body or head, tooth pain, and snakebite injury [218,219]. The fresh leaf and seed decoctions are effectively used in curing intestinal ulcers traditionally [218]. It has been shown that the methanolic extract of M. pudica exhibited more gastroprotective properties than chloroform extract after administrating two different doses (100 and 200 mg/kg) for a duration of eight days [220]. It has enhanced gastroprotective properties because of the presence of phyto-constituents (e.g., flavonoids, alkaloids, and tannins) and free radical scavenging activity [220]. The ethanolic extract of M. pudica, at the dose of 400 mg/kg, significantly attenuated ulcerative colitis induced by 4% acetic acid and potentially reduced both myeloperoxidase and malondialdehyde in rats when compared to the reference drug prednisolone [221].

3.26. Momordica charantia

M. charantia is a climbing plant of the Cucurbitaceae family. It is often called ‘bitter gourd’ worldwide and as ‘corolla’ in Bangladesh [222,223]. Powder prepared from the whole plant is locally used in treating diversified ulcers [218]. The local people use the unripe fruits as vegetables and cook them. The highest percentage of gastric ulcer inhibition was shown to be 62.85% in the ethanol-induced ulcer model at a dose of 100 mg/kg compared to the standard ranitidine [224]. There was significant healing activity with this plant extract to treat acetic acid-induced gastric ulcers [225]. The extract successfully reduced the ulcer index and inhibited the development of gastric ulcers in all the experimental ulcer models including indomethacin-induced, pylorus-ligated, ethanol-induced, cysteamine-induced duodenal ulcers, and stress-induced ulcer models [226].

3.27. Moringa oleifera

M. oleifera of the Moringaceae family is locally known as ‘shajna’ in Bangladesh and as ‘drum-stick tree’ worldwide [223]. This plant contains active constituents like alkaloids, beta carotene, tannins, beta sitosterol, zeatin, quercetin, flavonoids, kaempferom, protein, vitamins, minerals, amino acids, phenolic acids, natural sugars, phytosterols, saponin, and terpenoids [227,228]. Quercetin (molecular formula: C15H10O7) (Figure 1), a flavonoid compound in M. oleifera, showed strong anti-inflammatory activity [229]. The leaf of M. oleifera helps in the treatment of ulcers, indigestion, asthma, and sinus pain [219,227,228]. The ethanolic root extract significantly decreased ulcer index, total acidity, and enhanced gastric pH at both doses of 350 and 500 mg/kg. The extract also has anti-secretory and cytoprotective potentiality [230]. The alcoholic leaf extract also resulted in the reduction of acid pepsin secretion and ulcer lesion [38]. The acetone, methanol, chloroform, and petroleum ether extracts of the leaves and fruits of M. oleifera were investigated on both gastric and duodenal ulcers using acetic acid, pylorus ligation, indomethacin, ethanol, and cold-restraint stress-induced gastric ulcer and cysteamine-induced duodenal ulcer model [231]. The methanol and acetone extract of the leaves exerted significant gastric antisecretory and gastric cytoprotective effects in pylorus-ligated rats and both ethanol- and indomethacin-induced gastric ulcers, respectively. Compared to the insignificant antiulcer effect of fruit, the leaf extract reduced both cysteamine-induced duodenal ulcers and the stress-induced gastric ulcers remarkably [231].

3.28. Psidium guajava

P. guajava of the Myrtaceae family is commonly known as ‘guava’, which contains different active chemical constituents like tannin, resin, quercetin, crystals of calcium oxalate, guaijaverin, fat, galactose-specific lecithins, cellulose, volatile oil, mineral salts, and flavonoids [228,232]. The decoction prepared from the leaves of P. guajava is useful in treating ulcers. The extract of P. guajava leaves is also effective in the problems associated with diabetes and stomachache [218,228,233].

3.29. Scindapsus officinalis

S. officinalis (family: Araceae), which is locally known as ‘guruchi lota’, is extensively used by folk medicinal herbalists in Bangladesh in treating ulcers, indigestion, anti-emetic, and helminthiasis [234]. When an in vivo study was conducted to figure out the efficiency of the fruit extract of S. officinalis to treat pyloric-ligation-induced gastric ulcers in Wistar rats, the high dose of the extract (500 mg/kg) showed the potential to minimize the ulcer index. The anti-ulcer activity might be ascribed to the free radical scavenging activity [235].

3.30. Shorea robusta

S. robusta of the Dipterocarpaceae family and is commonly known as ‘sal tree’ and locally known as ‘shaal’, in Bangladesh [236]. This plant contains different active constituents like mangiferonic acid, uvaol, ursolic acid, αand β amyrin, asiatic acid, tri, and tetrehydroxyursenoic acid [236]. Ointments prepared from S. robusta are traditionally used in curing different ailments such as ulcers, wounds, hemorrhoids, burns, dermatitis, pain, swelling, ear problems, and eye problems. The resin or oleoresin (gum) of the plant is used in curing diarrhea, gonorrhea, and dysentery [236]. Rats received S. robusta resin at doses of 150 and 300 mg/kg for treating ethanol and pyloric ligation-induced gastric ulcer, prevented gastric mucosal damage, decreased gastric juice volume, total acidity, and pepsin secretion [237].

3.31. Solanum nigrum

S. nigrum of the Solanaceae family is commonly known as ‘black nightshade’ and locally known as ‘kakmachi’ [209]. The active constituents in this plant are phytosterols, glycoproteins, glycoalkaloids, saponins, polysaccharides, flavonoids, gallic acid, alkaloids, catechin, naringenin, protocatechuic acid, rutin, caffeic acid, and epicatechin [130,202,238,239]. People consume the fresh leaves of S. nigrum traditionally in the treatment of intestinal ulcers including hepatotoxicity, body pain, cancer, abdominal problems, and in improving the functions of CNS and the brain [130,202,238].

3.32. Syzygium aromaticum

S. aromaticum of the Myrtaceae family is commonly known as ‘clove’ and locally known as ‘lobongo’ in Bangladesh [240]. S. aromaticum contains active volatile and non-volatile constituents like flavonoids, essential oils (e.g., phenyl propanoids, carvacrol, eugenol, thymol, cinnamaldehyde), triterpenes, hydroxycinnamic acid, sterol (e.g., campesterol, stigmasterol) hydroxyphenylpropene, tannins, and hydroxybenzoic acids [130,241,242,243]. The flower bud of the plant helps to prevent ulcers. Traditionally, it is used in dental care for tooth aches, oral ulcers, as a disinfectant in wounds and insect bites, for purifying blood, for maintaining cardiovascular health, as a platelet inhibitor, and in boosting the immune system [236,241].

3.33. Terminalia chebula

T. chebula, of the Combretaceae family, is commonly known as ‘chebulic myrobalan’. In Bangladesh and India, it is well known as ‘haritoki’ [202]. This plant contains diverse bioactive chemical compounds such as chebulic acid, sorbitol, chebulinic acid, tannic acid, chebulagic acid, lucilage, gallic acid, tannin, corilagin, fixed oils, ellagic acid, resin, flavonoids, fructose, amino acids, and sterols [130,202,244]. T. chebula mixed with triphala and sindhu salt, is used in treating ulcers and ulcerated wounds. The fruit helps in the treatment of blood dysentery and stomachache. The maceration of the bark of T. chebula, in addition to other medicinal plants, helps in waist pain and pain in bones [202,244,245]. Chebulinic acid (molecular formula: C41H32O27), is also called 1,3,6-tri-O-galloyl-2,4-chebuloyl-β-d-glucopyranoside, is an ellagitannin abundant in the fruits of T. chebula had strong therapeutic efficacy on gastric ulcers [246].

3.34. Tinospora cordifolia

T. cordifolia (family: Menispermaceae), locally known as ‘pipolti’, is traditionally used as a treatment for gastric trouble and ulcers [247]. Moreover, the anti-ulcer efficiency of T. cordifolia extracts was assessed in ethanol and the pylorus ligation-induced ulcer model whereas a remarkable reduction of ulcer index, gastric volume, and total acidity supported the efficacy of the extract as an anti-ulcer agent [248]. The major phytocomponents which were isolated from the T. cordifolia, sesquiterpene tinocordifolin, tinocordifolioside, sesquiterpene glycoside, arabinogalactan, tinocordiside, makisterone, magnoflorine, and palmatine could play a vital role in reducing the illness [249].

3.35. Zingiber officinale

Z. officinale of the Zingiberaceae family is commonly known as ‘ginger’, which is traditionally used as a medicinal preparation in the treatment of peptic ulcers, diarrhea, allergy, smallpox, asthma, urticaria, fever, impotence, and bronchitis [216,250,251]. Several previous studies in animal models showed that gastrointestinal ulcers were induced by hypothermic restraint stress and NSAIDs [252,253,254]. Zingerone (molecular formula: C11H14O3) (Figure 1), a phenolic active constituent of ginger (9.25%) [255], showed the anti-ulcer efficacy in vivo when Wistar rats were fed with zingeron doses (50, 100, 200 mg/kg), by lowering the number and length of ethanol-induced ulcers in zingerone uptaken groups. The effect of zingeron is protective on the artificially induced ulcer because of its free radical quenching potentiality [256]. Research suggested that ginger constituents ameliorate low-dose aspirin-induced gastric ulceration in the gastrointestinal tract. Therefore, a novel prodrug of aspirin designed as 6-gingerol aspirinate reduced acute stomach injury induced by aspirin in mice [257]. It is proposed that the anti-ulcer and healing capacities of zinger, are achieved due to its strong thromboxane synthetase feature, inhibition of K+-ATPase, gastric H+, and H. pylori growth by phenolic antioxidants [252].
All the medicinal plants discussed above show anti-ulcer activity and their uses are in practice among people since ancient time. These plants not only cure ulcers but also show potency against other diseases. The modes of action of bioactive compounds isolated from medicinal plants is summarized in Figure 2. Moreover, other similar medicinal plants with antiulcer and anti-inflammatory activity are summarized in Table 1, with their therapeutic uses and medicinal parts to be used, for easy identification.

4. Conclusions and Future Directions

There is a belief that the solutions to all health problems can be found in nature. Currently, humans are victimized by various life-threatening diseases, and in the form of medicinal plant, nature has proven its potency in preventing and curing these diseases. Between 70% and 80% of people throughout the world are solely dependent on primitive or herbal medicines [286]. The worldwide demand for herbal medicine is great and is growing. However, the trials and experiments in this sector are very limited until recently, and this reflects our lack of knowledge about nature. All around the world, there are huge numbers of medicinal plants but the medicinal value of less than one-third of them have been discovered and identified. Still now, more comprehensive, and reliable scientific studies are needed to evaluate and ensure the safety and efficiency of medicinal plants, as well as their potential metabolites in ulcers and inflammatory disease treatment. The quality of the targeted active compounds should be tested repeatedly or batch-to-batch for ensuring reproducibility as well as uniformity of the active components. The implementation of randomized clinical trials overcoming exiting challenges like study design, selection of controls, and active ingredients standardization is urgently needed. International and local regulatory bodies should come forward to facilitate and monitor the clinical trials for achieving a breakthrough outcome.

Author Contributions

Conceptualization, S.R.A., M.F.R. and M.M.H.C.; investigation, S.R.A., M.F.R., A.R., R.C. and A.B.; writing: S.R.A., M.F.R., A.R., R.C., K.K. and M.M.H.C.; visualization, R.C. and M.F.R.; project administration M.M.H.C. and K.-H.B., supervision, M.M.H.C. and K.-H.B., reviewing, M.M.H.C., K.-H.B. and K.K., editing: K.-H.B., M.M.H.C. and K.K.; funding acquisition, K.-H.B. All authors have read and agreed to the published version of the manuscript.


This research was funded by Rural Development Administration (RDA), grant number PJ015726, Republic of Korea.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.


This work was carried out with the support of the Cooperative Research Program for Agriculture Science and Technology Development (grant number PJ015726), RDA, Republic of Korea. The figures were created with (accessed on 21 May 2021).

Conflicts of Interest

The authors declare no conflict of interest.


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Figure 1. Chemical structures of different bioactive compounds derived from the medicinal plants.
Figure 1. Chemical structures of different bioactive compounds derived from the medicinal plants.
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Figure 2. Modes of action of bioactive compounds of medicinal plants to treat ulcers and inflammatory diseases.
Figure 2. Modes of action of bioactive compounds of medicinal plants to treat ulcers and inflammatory diseases.
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Table 1. Common medicinal plants of Bangladesh used in the treatment of ulcer, inflammatory, and other related diseases.
Table 1. Common medicinal plants of Bangladesh used in the treatment of ulcer, inflammatory, and other related diseases.
Name (Family)Local Name in BangladeshCommonly Used Medicinal PartsTherapeutic UsesReferences
Acacia senegal (Leguminosae)Babla Roots, bark, wood leaves, flowers, gums, and seedsUsed to treat ulcers, inflammation, to cure stomach and throat pain[228,258]
Acacia farnesiana (Leguminosae)Belatibabul Leaves, bark, and flowersAnti-inflammatory, anti-hepatotoxic, anti-pyritic and anti-ulcerogenic[259,260]
Achyranthes aspera (Amaranthaseae)ApangWhole plant, roots, and seeds Used to treat ulcers and inflammation[261,262]
Albizia procera (Mimosaceae)SilkoraiBark and leavesUsed to treat ulcers, threadworms, skin scabies, and tooth pain[233]
Allophylus serratus (Sapindaceae)TippaniLeaves, roots, flowers and seedsUsed to treat ulcers, inflammation, and gastrointestinal disorders[130,263]
Alstonia scholaris (Apocynaceae)Chatim Bark and latexUsed to treat ulcer, dysentery, and rheumatism [36,264]
Amaranthus viridis (Amaranthaceae)NoteyshakLeaves and seedsUsed to treat ulcer and inflammation[265]
Amberboa moschata (Asteraceae)JamRootsUsed to treat ulcers, malignancy, and menstrual disorders [66]
Angelica sinensis (Apiaceae)Not knownAerial partsUsed to treat ulcerative colitis[266]
Anogeissus latifolia (Combretacea)DhaiRoots, bark, leaves and fruitsUsed to treat inflammation, ulcer, dysentery, hemorrhoids, and liver diseases[261,267]
Azadirachta indica (Meliaceae)NeemLeaves, roots, seeds, and barkAnti-inflammatory, anti-pyretic, anti-ulcer, anti-arrhythmic, anti-protozoal, and gastrointestinal disease[268,269,270]
Basella alba Linn (Basellaceae)PuishakLeavesUsed to treat ulcers and constipation[259]
Butea frondosa (Leguminosae)Palash Flower, roots, gums, stem, bark and seedsAnti-ulcerogenic, anti-hemorrhagic activity, and septic sore throats [36]
Carissa congesta (Apocynaceae) KaramchaRoots and leaves Used to treat diabetes and ulcers[157]
Cissus quadrangularis (Vitaceae)Harjora or Harbhanga Stems and rhizomesUsed to treat stomach trouble and ulcers[135]
Colocasia esculenta (Araceae)Mukhikachu Whole plantUsed to treat tumor, ulcers, cancer, constipation, and indigestion[157,219,233,271]
Commiphora mukul (Burseraceae)Guggul Guggul gumUsed to treat ulcers, atherosclerosis, rheumatism, and hypercholesterolemia[228,272]
Desmostachya bipinnata (Gramineae)Kush or DurvaRootsUsed to treat ulcers, cancers, and diarrheal disease[130,273]
Dyospyros perigrina (Ebenaceae)GaabFruits and seedsUsed to treat ulcer, diarrhea, dysentery, and wounds [233]
Dyospyros philippensis (Ebenaceae)BoniokFruits and seedsUsed to treat ulcer, diarrhea, dysentery, and wounds[233]
Euphorbia hirta (Euphorbiaceae)Bara or Dudhia Whole plantUsed to treat ulcers, inflammation, and bronchitis [219,233,273]
Euphorbia neriifolia (Eurphorbiaceae)Mansaij or PatasijLeaves, flowers, fruits, and seedsUsed to treat ulcers, scabies, and schizophrenia[228,274]
Excoecaria agallocha (Euphorbiaceae)GewaLeaves, bark, rootsUsed to treat microbial infections, cancers, wound and ulcers.[130,275]
Ficus religiosa (Urticaceae)Aswatha or Panbot Leaves, stem bark, seeds, and rootsUsed to treat ulcers, asthma, epilepsy, and inflammatory gastric problems[276,277]
Ginkgo biloba (Ginkgoaceae)Adel or GinkgoRootApplied to cure colitis [278]
Heliotropium indicum (Boraginaceae)HatisurWhole plantUsed to treat ulcers, sores, and rheumatism[233,244]
Lannea coromandelica (Anacardiaceae)JigaBarkAnti-eruptions, anti-leprous, anti-ulcer, and ulcerative dyspepsia [158,233]
Lawsonia inermis (Lythraceae)Mehedi LeavesCures wounds and ulcers[228,244]
Lens esculenta (Leguminosae)MasurSeedsUsed to treat ulcers[233]
Lippia nodiflora (Verbenaceae)Bhui OkarLeaves and whole plantUsed to treat bronchial problem and ulcers[259]
Ludwigia adscendens (Onagraceae)KeshardamWhole plantUsed to treat ulcers [233]
Mikania micrantha (Asteraceae)Toopainna Lata LeavesUsed to treat gastric ulcers and discomfort of digestive tract[66]
Nerium indicum (Apocynaceae) KarabiRoots, leaves, and whole plant Anti-ulcer, diuretic, and reduce swellings [279]
Oxystelma esculentum (Asclepiadaceae)Dudhi or Dudhia LataLeaves, petiole, stem, roots, and rhizomesAnti-ulcer, diuretic, and anti-bronchitis activity [261,280]
Piper betel (Piperaceae)PaanLeavesUsed as digestive aid, anti-oxidant, anti-inflammatory, and analgesic property[130,281]
Plumeria alba (Apocynaceae)KathgolapBark, leaves, flower buds, and latexUsed to treat syphilitic ulcers [279]
Polyalthia longifolia (Annonaceae) DebdaruWhole plant Anti-ulcerogenic, hepatoprotective, anti-inflammatory, blood pressure, fever, and moisturizing activity[282,283]
Scoparia dulcis (Scrophulariaceae)Michri DanaLeavesUsed in the treatment of inflammation and nerve problems[244]
Sesbania grandiflora (Leguminosae)BokfulLeavesUsed to treat ulcers[284,285]
Smilax ovalifolia ( Smilacaceae)KumarilataLeaves and stemsUsed to treat ulcers[66]
Vernonia patula (Asteraceae)Kuksim Aerial partsAnti-ulcer, anti-inflammatory, and anti-dropsy[219]
Xanthium indicum (Asteraceae)GhagraStems, roots, fruits, leaves, and whole plantUsed to treat ulcers, tumors, and smallpox [219]
Zizyphus mauritiana (Rhamnaceae) Ber or KoolRoots and barkUsed to treat wounds, fever, ulcers, and diarrhea[233]
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Ahmed, S.R.; Rabbee, M.F.; Roy, A.; Chowdhury, R.; Banik, A.; Kubra, K.; Hassan Chowdhury, M.M.; Baek, K.-H. Therapeutic Promises of Medicinal Plants in Bangladesh and Their Bioactive Compounds against Ulcers and Inflammatory Diseases. Plants 2021, 10, 1348.

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Ahmed SR, Rabbee MF, Roy A, Chowdhury R, Banik A, Kubra K, Hassan Chowdhury MM, Baek K-H. Therapeutic Promises of Medicinal Plants in Bangladesh and Their Bioactive Compounds against Ulcers and Inflammatory Diseases. Plants. 2021; 10(7):1348.

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Ahmed, Sheikh Rashel, Muhammad Fazle Rabbee, Anindita Roy, Rocky Chowdhury, Anik Banik, Khadizatul Kubra, Mohammed Mehadi Hassan Chowdhury, and Kwang-Hyun Baek. 2021. "Therapeutic Promises of Medicinal Plants in Bangladesh and Their Bioactive Compounds against Ulcers and Inflammatory Diseases" Plants 10, no. 7: 1348.

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