Abstract
Microbial contamination of chronic wounds complicates their treatment. Traditional knowledge systems and the diversity of indigenous medicinal plants create a haven for traditional medicine practices in South Africa (SA). This systematic review aims to present a comprehensive ethnobotanical report of traditional medicines used in the documented empirical wound healing studies in SA. Google Scholar, PubMed, Medline EBSCOhost, Science Direct, and Scopus were sourced using the keywords/terminologies “South Africa”, “medicinal plants”, “traditional medicine” “indigenous”, “skin”, “wound”, “ethnobotany”, “survey”, “interview”, and “treatment” in different combinations. Relevant and unpublished records were retrieved from the Global Electronic Thesis Database. The searching process identified 32,419 records, of which 4005 studies were screened. Following the removal of 1795 duplicates, the remaining 2210 sources were screened by title and abstract, and 133 full-text reports were accessed and evaluated. Plants traditionally used for wound-healing purposes comprised 222 species belonging to 71 families, namely Asteraceae (predominantly the Helichrysum species), Asphodelaceae, Fabaceae, Solanaceae, and Euphorbiaceae. Plant organs used for medicinal remedies included leaves, roots, and bark prepared as poultices, infusions, decoctions, gel/ointments/lotions, and pastes. This review provides a valuable reference for future phytochemical and pharmacological studies and highlights the need for further ethnobotanical research to treat wounds in SA.
Keywords:
wound(s); skin; ethnobotany; survey; interview; traditional medicine; medicinal plants; South Africa 1. Introduction
Wounds can be defined as physical, chemical, or thermal injuries that disrupt the function, cellular, and anatomical integrity of the skin [1,2]. Globally, wounds have become a major health challenge affecting an estimated 14 million people, with 80% of cases occurring in developing countries [3]. The clinical and economic burden of wound care on the South African healthcare system remains unknown [4]. Lotz [5] investigated the burden of wound care in a resource-limited, tertiary hospital within the Western Cape Province and revealed that, in one day of the study, 34.6% of patients admitted presented with wounds and occupied 79% of vacant beds. These results concur with international reports associating billions of dollars with wound care costs [4,5].
Conventional medicine recommends antibiotic therapy for various skin conditions, including wounds. However, evidence suggests that microbial pathogens are continuously developing multidrug resistance, thereby compromising the effectiveness of this treatment approach and threatening public health [6,7,8]. Worldwide, South Africa (SA) has the highest prevalence of individuals living with the human immunodeficiency virus (HIV) and contributes to a third of the new HIV infections in the Southern part of Africa. Approximately 90% of persons infected with HIV develop a skin condition at some stage of the disease and have an increased susceptibility to wound infections as their immune systems weaken [9,10]. Consequently, most of these patients have a heightened incidence of bacterial infections and wound complications, in addition to a weakened and delayed wound-healing response [10]. Considering that skin conditions, including wounds, often persist among the immunocompromised and remain contagious for long periods, it is not surprising that patients are opting for alternate forms of therapy, such as traditional medicine, which is perceived to be better and safer for use [11].
The traditional use of plants as an alternate or adjunct form of therapy to Western medicine has largely become the backbone of rural healthcare in SA and the wider African continent [12,13]. SA has a mixture of cultures, beliefs, and languages that contribute to the diverse knowledge of traditional medicine [14]. Combined with the numerous plant species indigenous to SA, this makes the country a rich hub for traditional medicine practices [15]. For people residing in rural areas, there are several benefits associated with this form of treatment. This includes easy access to a traditional healer living close to their homes, the familiarity of a traditional healer with the individual’s cultural beliefs and surroundings and, importantly, the low cost associated with treatment [13]. Furthermore, herbal medicines are perceived to offer fewer side effects and better patient tolerance [16].
Agyare et al. [17] reported a selection of 61 southern African medicinal plant species with scientifically proven wound-healing properties. This list included the plant Ageratum conyzoides, used by traditional healers in SA for application to fresh wounds. Experiments using various plant extracts were assessed using excision, incision, and dead space wound models; the results revealed that methanol and aqueous plant extracts facilitated rapid wound healing. In a separate study, wounds treated with the bark extract of the plant species Kigelia africana showed improved collagenation, re-epithelisation, and granulation compared to untreated wounds in a rat excision model [18]. Aspalathalus linearis, commonly referred to as ‘Rooibos’, is a traditional herb used by the Khoisan in the form of a tea. Pringle et al. [19] conducted an in vitro assay that investigated the effect of fermented and aspathalin-enriched green rooibos on chronic wounds. Results showed that the pro-inflammatory activity of fermented rooibos had a beneficial effect on wounds, particularly wounds caused in the early stage of diabetes when the initial inflammatory response is delayed. On the other hand, green rooibos effectively protected fibroblasts against oxidative stress, suggesting a therapeutic potential for wounds with a heightened inflammatory response.
Ethnobotanical studies are largely used as a primary phase in identifying and developing pharmaceuticals from medicinal plants, as this could lead to the recognition of known and unknown biologically active compounds [20]. Studies of this nature are significant in identifying local plants used by communities for medicinal purposes [16]. Due to modernisation, valuable information from traditional healers on the wound-healing properties of plants has been lost, leaving a knowledge gap [2]. The need for ethnobotanical research to discover and record valuable medicinal knowledge cannot be over-emphasised [21].
A previous review by Mabona and Van Vuuren [11] examined the ethnobotanical literature and reported over 100 plant species traditionally used to treat skin conditions in southern parts of Africa, of which 41% were reportedly used for wounds. Another review assessing the available literature extending to the year 2017 identified only 20 plant species used historically to treat wounds in southern Africa [2]. Therefore, an in-depth compilation and analysis of the ethnobotanical studies reporting on wound treatment and management, specifically in SA and among certain cultural groups are warranted. This review aims to collate ethnobotanical reports from a comprehensive bibliographic search of empirical studies evaluating published and unpublished data on the traditional knowledge of plants used for wound care. The objectives are as follows: (a) to identify indigenous plants used in SA for wound healing; (b) to discuss traditional methods used in their preparation and application; and (c) to report on their biological properties. The outcome of this study will contribute to a global database of medicinally significant plant species, which will serve as a valuable reference for future phytochemical and pharmacological studies concerning remedies and ingredients for wound treatment.
2. Results and Discussion
2.1. Literature Search Results
A total of 32,419 studies were identified for preliminary review, of which 28,414 were considered irrelevant and excluded (Figure 1). The remaining 4005 records were screened, and 1795 duplicates were removed, leaving 2210 records for further evaluation. Using the specific inclusion and exclusion criteria, 133 articles and theses were assessed for eligibility and the final inventory for analysis and reporting comprised 27 papers.
Figure 1.
Workflow of selected sources of information.
2.2. Characteristics of the Ethnobotanical Studies Documenting the Use of Plants Traditionally Used to Treat Wounds in SA
This review reports on 27 ethnobotanical studies of medicinal plants traditionally used by South Africans to treat wounds (Table 1). As shown in Table 1, the studies were irregularly distributed over eight provinces in SA, with most of the research taking place in Limpopo (24%), the Eastern Cape (24%), and KwaZulu-Natal (17%). Other studies were accounted for in the provinces of the Northern Cape (10%), Western Cape (10%), North West (7%), and Mpumalanga (3%), with no relevant studies recorded in Gauteng. Limpopo is largely a rural province dominated by traditional medicine practices, owing to its rich plant diversity [12,22]. Despite numerous ethnobotanical studies exploring the medicinal value of plants in the province, there still seems to be a paucity of data concerning indigenous knowledge and practices on natural-based cosmeceuticals for skin conditions and wounds, specifically among certain ethnic groups, such as Vhavenda women [23]. This is corroborated by only seven studies conducted in the Limpopo region that report on plant usage for wound treatment. Considering the diverse and abundant flora within the Western Cape and North West provinces, and the large proportion of the South African population residing in rural areas who are highly dependent on traditional medicine, it is surprising that there is a shortage of ethnobotanical research investigating the increasing incidence of skin injuries, such as wounds [9,24,25]. However, other factors such as lack of awareness, inadequate funding, language, or cultural barriers, may have, contributed to the paucity of studies highlighted in this review [22,26]. The study conducted by Grierson and Afolayan [27] was the only report that intentionally focused on the use of medicinal plants for wound healing, while other studies covered topics related to general skin conditions or other ailments, thus revealing a gap in the research concerning wounds.
The included studies comprised sample sizes of 5–101 participants. Informants were classified as traditional health practitioners (healers, doctors, or sangomas), herbalists, indigenous knowledge holders, including medicinal plant sellers, village elders, and community members living in rural areas. The most common data collection method was structured or semi-structured interviews using questionnaires. Among the methods implemented were the Rapid Appraisal approach, the Matrix method, with the aid of a visual guide, or a combination of the aforementioned methodologies [28,29,30]. Such an approach to ethnobotanical research is advantageous, since this provides a means of becoming familiar with participants while obtaining insights that can be compared to the results of structured techniques [31]. Multi-disciplinary methods facilitate the collection of quantitative and qualitative data on contemporary theoretical problems concerning the development, nature, and transfer of ethnobotanical knowledge [22,31].
Table 1.
Characteristics of the ethnobotanical studies on wound treatments in South Africa.
2.3. Medicinal Plants Identified for Wound Healing Purposes
This review collated information on the use of plants reported for wounds in general (63%) as well as wounds caused by cuts (3%), scrapes (1%), burns (24%), snake bites (6%), and circumcision (2%). A total of 222 species belonging to 71 families were identified as plants traditionally used for wound-healing purposes. Among all plant families reported, Asteraceae was the most cited (26 species), followed by Asphodelaceae (17 species), Fabaceae (15 species), Solanaceae (11 species), and Euphorbiaceae (10 species), respectively (Figure 2). Other families, some of which are indicated in Figure 2, were represented by 1–7 plant species.
Figure 2.
Ten traditionally used plant families with the highest number of species reported for wound healing.
2.4. Biological Activity of Commonly Identified Plant Families and Related Species
2.4.1. Asteraceae
Asteraceaeous plants are widely distributed with over 1600 genera and 25,000 species globally. These plants inhabit sub-Saharan Africa, with 314 plants from 112 genera [33,48]. The extensive availability and abundance of various plant species may be the major reason for these plants being frequently cited for their medicinal use. Most Asteraceae family members have therapeutic applications with a well-established history of their use in traditional medicine [49]. They have been highly representative in numerous ethnobotanical studies, which may be linked to their phytochemical composition with associated medicinal significance [50]. Asteraceae plant species have demonstrated anti-inflammatory, antioxidant, antimicrobial, and wound-healing properties [48,49].
This review revealed the various Helichrysum species of the Asteraceae family as the plants predominantly used for wound healing. The Helichrysum species comprise essential oils and phytochemicals, such as phenolic acids, terpenes, flavonoids, and chalcones, which have often been associated with their therapeutic properties. As such, these plants are potential reservoirs of bioactive compounds for drug exploration and advancement. According to Akinyede et al. [51], only limited studies have been conducted on the biological effects of the Helichrysum species and their related phytochemicals.
Wound healing is a natural process, but complications can occur when a wound becomes infected with multidrug-resistant bacteria, thereby hindering the healing process and conventional treatment regimens. Plants possessing antimicrobial activity show promise as an option for wound repair and management [52]. Some Helichrysum species reported in this review, namely Helichrysum petiolare and Helichrysum odoratissimum, have demonstrated antimicrobial activity against gram-positive and gram-negative pathogens, supporting their traditional use in addressing wound infections [51,53]. Six different Helichrysum species, along with 21 other Asteraceae species, have been identified in the current review, of which only a few have been regularly reported for wound treatment. The frequent use of some of these plants could indicate that they are good candidates for further biochemical investigation [3]. The less reported plants should be further explored using in vitro and in vivo models. Such studies may enhance our current knowledge of the role of these plant species in wound healing, thereby creating a wider pool of plants for further development as cosmeceutical and/or pharmaceutical ingredients and products.
2.4.2. Asphodelaceae
Data analysis showed two genera belonging to the Asphodelaceae family, namely Aloe (11 species) and Bulbine (6 species), as the most reported plants for wound care. Similar to Asteraceae, the probable reason for the increased usage of this family could be their extensive occupancy across the African continent. Aloes comprise about 548 accepted species, of which approximately 350 species are located in Africa, and are well recognised for their therapeutic properties [54]. Plants of the Bulbine genus are identified as succulent perennials, accounting for 78 species dispersed mainly in southern Africa, and widely used in traditional medicine [55]. Aloe ferox and Aloe arborescens (Table 2) have been used globally to treat and manage dermal wounds and burns.
Table 2.
Plants traditionally used for wound healing in South Africa.
Aloe arborescens is indigenous to South Africa and has been used by different cultural groups (Zulu, Xhosa, and Khoisan) to treat minor cuts, irritations, and burn wounds because of its anti-inflammatory activity [56]. Jia et al. [57] conducted a study investigating the wound-healing effect of A. ferox and A. arborescens on incisional wounds using a rat model and showed that both plants effected wound closure and facilitation of the healing process. Furthermore, these plants proved to have antimicrobial activity and no adverse effects on the skin, thereby supporting their use for dermatological application [57]. Other identified species of Aloe, namely A. thraskii Baker and A. marlothii have limited scientific evidence validating their wound healing effect, especially regarding their phytochemical and biological activity [58,59].
The traditional use of Bulbine species (Table 2) for its wound-healing properties is well established. Pather and Kramer [60] investigated the effect of Bulbine natalensis and Bulbine frutescens extracts on cutaneous wounds using a pig model. Results showed that wound closure increased significantly compared to the control group. Following treatment with leaf gels of the plants, the tensile strength of the wounds was observed to be much stronger, with an increase in protein, DNA, and collagen content [55,60]. Another study conducted by Hattingh et al. [61] included a scratch wound assay that showed an increase in the percentage of wound closure and migration rates of B. frutescens compared to control samples [61]. These recent studies scientifically validate the wound-healing properties of the Bulbine species. However, only a few species have been investigated, prompting questions related to the bioactivity of other lesser-known South African Bulbine species [4].
2.4.3. Fabaceae
The Fabaceae family, commonly known as the legume or bean family, constitutes a group of medicinally and economically important plants, comprising 751 genera and an estimated 19,500 species [62,63]. The ethnobotanical studies conducted in the southern parts of Africa, including Namibia, Mozambique, and Zimbabwe have documented Fabaceae as a rich and therapeutic resource within these regions [64]. The frequent application of this plant species in traditional medicine is most likely linked to its wide distribution. Over the years, the sustained use of the Fabaceae plant family has been documented for its antibacterial, antifungal, antiviral, anticancer, anti-inflammatory, hepatoprotective, and neuroprotective effects. These biological activities have been associated with the plant’s phytochemical composition, revealing that this species contains crucial active metabolites [50,63].
Among the ten documented plant genera within the Fabaceae family, the Desmodium, Erythrina, and Eriosema species were cited for their therapeutic effect on wounds. In terms of wound repair, the antioxidant, anti-inflammatory, and antimicrobial activity of plant-derived bioactive compounds stimulate blood coagulation, combat infection, and accelerate the wound healing process [65]. A study performed by Pitkin et al. [66] aimed to establish the antimicrobial activity of Desmodium incanum, also referred to as the Beesbush plant. The well diffusion antimicrobial assay was employed and revealed that the Beesbush plant potently reduced the growth and replication of three microorganisms, namely Staphylococcus aureus, Group D Streptococcus, and Klebsiella pneumoniae at concentrations of 60 mg/dl and 100 mg/dl [66]. Considering that these species fall within a group of wound pathogens that exhibit multidrug resistance, further investigation into this plant species, as well as the rest of the genus, is warranted [67,68].
Erythrina lysistemon, Erythrina caffra, and Erythrina latissimi are plant species indigenous to South Africa, and their traditional application is reflective of their potential anti-inflammatory, antibacterial, and analgesic effects. Khumalo et al. [69] investigated the immunomodulatory effect of E. lysistemon to traditionally treat inflammatory conditions. Cytokine multiplex-bead assays were employed to assess the anti-inflammatory potential of the plant by evaluating the activity of interleukin-2 and interleukin-10 cytokines. Results showed that unstimulated murine RAW 264.7 macrophage cells exposed to the aqueous bark extract of E. lysistemon significantly upregulated levels of both anti-inflammatory cytokines with a 7000-fold increase in the level of IL-10 compared to the negative control [69]. The modulatory action of E. lysistemon is particularly noteworthy, and its effect may be linked to its inhibitory effect against natural killer cells, macrophages, and TH1 cells, which play an important role in tissue damage. In another study, the essential oil of E. caffra displayed antimicrobial activity against gram-positive and gram-negative bacteria. Furthermore, E. caffra showed the ability to scavenge superoxide and hydroxyl radicals, hydrogen peroxide, nitric monoxide, and singlet oxygen. This result is a good indicator of strong antioxidant activity, which is known to aid in the wound repair process [70].
To our knowledge, the ethnobotanical study by Mhlongo and Van Wyk [29] is the only one to have identified the two plant species Eriosema cordatum and Eriosema distinctum as plants traditionally used to heal wounds. Other reports on the traditional purposes of these plants include E. cordatum, used by Zulu traditional healers to address sexually related problems, such as erectile dysfunction or impotency, while E. distinctum has been reported to treat colds and influenza [71,72]. Several studies dealing with the antibacterial and antifungal effects of the Eriosema species have been documented; however, research focusing on the phytochemical, pharmacological, and toxicological evaluations of these two specific plants is limited [71], probably due to a lack of ethnobotanical studies identifying E. cordatum and E. distinctum for wound healing or other medicinal purposes.
2.4.4. Amaryllidaceae, Aizoaceae, and Solanaceae
The plant species, Boophane disticha, Carpobrotus edulis, and Datura stramonium, belonging to the families Amaryllidaceae, Aizoaceae, and Solanaceae, respectively, were frequently cited (>5 studies) for wound healing purposes. In traditional medicine, B. disticha has been used for treating wounds, abdominal aches, and eye problems [73]. Phytochemical studies have revealed that crude extracts of B. disticha possess strong antioxidant activity, as reflected in their phenolic, alkaloid, and flavonoid content [74]. C. edulis, commonly referred to as the “Hottentot-fig” has been used as a herbal remedy for skin conditions such as burns, wounds, chilblains and eczema. The plant has been reported to be a rich source of bioactive compounds, associated with antioxidant, antimicrobial, and anti-inflammatory properties [75]. The biological activity of the plant species D. stramonium has also been demonstrated in vitro, highlighting its anti-inflammatory, antimicrobial, and antifungal activity potential. This evidence substantiates the traditional use of the plant in ayurvedic medicine to treat ulcers, wounds, bruises, and swelling [76].
2.5. Plant Parts Reported for Wounds
The most cited plant organs used for medicinal remedies included leaves (39.9%) and roots (13.4 %), followed by the bark (5.8%); 21% of reports accounted for other plant parts (Figure 3). This result is supported by the predominant use of leaves for treating skin conditions documented in various ethnobotanical studies [44,77,78,79,80,81]. According to Aumeeruddy and Mahomoodally [82], the high usage of leaves is a general trend observed in traditional medicine and could be attributed to their abundance and the ease with which they are obtained compared to other plant parts. Leaves are the primary photosynthetic organ of plants and are regarded as key components of phytoconstituents. The preference for leaves may specifically be due to their high quantity of active ingredients like tannins and alkaloids [83]. The high frequency of roots used in herbal remedies is also believed to be related to their phytochemical composition and heightened pharmacological activity, compared to other plant parts [83,84]. It is important to note that approximately 20% of the studies did not provide information on the plant parts used. Anecdotal reports suggest that some traditional healers are not entirely comfortable sharing in-depth knowledge with researchers due to a lack of trust or fear of product development without any acknowledgement or benefit.
Figure 3.
Parts of plants used to treat wounds.
2.6. Methods of Preparation and Route of Administration
The major methods of preparation recorded were poultices (17.7%) and infusions (12%). This was followed by decoctions (9.8%), gels/ointments/lotions (7.6%), and pastes (6.8%) (Figure 4). A lack of reporting by authors (24%) was once again observed on this aspect of the included studies. The formulation of herbal medicines is a crucial process, since it determines how the therapeutic properties of the plant are best released to effectively treat a condition [85]. The increased use of poultices for wounds can be attributed to this being a simple method of application to a wound or body part. This result is similar to other studies conducted in countries such as Malaysia and Uganda, where poultices are the most popular method for wound treatment [3]. Reports have indicated that well-known plants for wound used for healing purposes, namely Ageratum conyzoides, Althaea officinalis, and Symphytum officinale are prepared in the form of poultices because this preparation method aids in speedy recovery and reduces bacterial infection [86]. In SA, infusion is often used as a mode of preparation for herbal remedies and is considered an effective process, since only a few resources are needed. The process is uncomplicated and entails combining plant material with boiled water for a certain period [87]. Evidence suggests that bioactive compounds contained in herbal infusions may be linked to a diverse range of effects inclusive of anti-inflammatory, antioxidant, and antibacterial properties [88], all of which play a significant role in facilitating the process of wound repair.
Figure 4.
Mode of preparation for plants used to treat wounds.
Figure 5 illustrates the dominance of topical applications as the popular route of administration for herbal remedies (59%). This correlates with the high reports of poultices used in the treatment of wounds as well as other topical treatments, such as the use of lotions, gels, powders, or pastes, documented in the included studies. According to Gwarzo et al. [89], the topical application of a cream creates a moist environment that prevents dryness of the affected skin and enhances the repair process by mitigating inflammation and preventing colonisation of the wound by microbial pathogens. This is in contrast to reports from West Africa, where community members believe that keeping a wound dry by applying sand, ash, or herbal remedies promotes wound healing [90].
Figure 5.
Administration routes for medicinal plants used to treat wounds.
Furthermore, topical application has a lower potential for absorption and toxicity [91]. Other modes of delivery, such as oral, wash, and steam, had lower frequency reports, within the range of 1–9%, while a significant number of the studies lacked reporting on this characteristic. It is particularly interesting that more than one route of administration was used. According to Alamgeer et al. [92], topical application is still a preferred and effective approach, as it allows direct contact of active constituents of the plant with the skin, providing rapid relief [92,93].
2.7. Conservation Status
Environmental conservation is a crucial source of income for local communities and, in sub-Saharan Africa, efforts towards the sustainable use of medicinal plants have been well emphasised [87]. Traditional healers have stringent cultural beliefs concerning the cultivation of medicinal plants and have therefore supported the conservation of these plants. Some of the traditional practices that have prevented plant species from being exploited include harvesting plant parts following the approval of ancestors and specific rituals, collection of only two roots of the same plant at one point in time and harvesting specific plants during winter to ensure the seed set and growth during the summer season. However, the shift in harvesting plant material from subsistence to commercial traders has contributed to the lower likelihood of traditional healers implementing these practices [94].
An assessment of the conservation status of various identified plants was conducted according to the SANBI Red List of South African Plants (http://redlist.sanbi.org, accessed on 15 October 2024). Results revealed that 77% of the species were of least concern (LC), 9% were invasive alien species, and 10% had not been evaluated. Four plants were classified as endangered/near threatened (Merwilla plumbea (Lindl.) Speta, Eucomis bicolor Baker, Aloe thraskii Baker, and Alepidea amatymbica), three plants (Brackenridgea zanguebarica Oliv., Euphorbia bupleurifolia Jacq., and Kniphofia drepanophylla Baker) were identified as vulnerable (critically endangered) and one species (Aptosimum procumbens (Lehm.) Burch. ex Steud.) was categorised as rare. The preferred use of leaves reported in this paper suggests traditional harvesting methods are indicative of a sustainable approach aimed at protecting plant species. Although most plants are of least conservation concern, the parts harvested from plants within the other categories included the use of bulbs, roots, rhizomes, or the entire plant. Using these plant parts can have a detrimental effect on the reproduction of medicinal plants in an area [92]. Furthermore, the harvesting of roots, stems, and bark has damaging effects on a plant, resulting in low heterogeneity and richness of a plant species [26]. Factors such as unplanned collection of plant material, increased exploitation, extensive grazing, prepping of land for deforestation, agriculture and erosion, and the attack of pathogens, all pose a significant threat to medicinal plants [92]. It is increasingly important to protect the future of plants considering their increased susceptibility to population decline when harvested intensively in an unsustainable way [87]. South Africa has recognised this issue and has implemented various strategies supported by provincial governments and municipalities to ensure the effective propagation processes for threatened plant species and to assess the effect of cultivation on the biological activity of plants with therapeutic benefits [94].
3. Materials and Methods
This review was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [95] and has not been registered. Electronic databases, namely Google Scholar, PubMed, Medline EBSCOhost, Science Direct, and Scopus, were sources for this review. The Global Electronic Thesis Database (http://search.ndltd.org, accessed on 10 August 2024) was further examined to access all relevant and unpublished records. The search strategy had no limitation in terms of publication status or language. All records up to and including July 2024 were searched. Primary search keywords or terminologies, such as “South Africa”, “medicinal plants”, “traditional medicine” “indigenous”, “skin”, “wound”, “ethnobotany”, “survey”, “interview”, and “treatment”, were combined using Boolean operators, with at least three key words in a single search. The studies were evaluated based on the following selection criteria: (a) Only primary ethnobotanical studies reporting on medicinal plants used to treat wounds in SA were included. (b) All lab-based studies, clinical trials, review articles, books, editor’s comments, and letters were excluded. To reduce bias in the selection and collection of data, the authors, along with the assistance of five student researchers, first worked independently and then together during the search (January 2022 to July 2024) and data collection (August 2024 to October 2024) processes. Any misinterpretations or disagreements were resolved when a consensus was reached based on a discussion between the researchers.
The ethnobotanical information pertaining to the scientific name of plant species, method of preparation, part of the plant used, and route of administration were extracted from the included sources. In the case of a study reporting on other types of skin-related conditions, only the relevant information on wounds was extracted. For studies including various methodologies, only the data related to the ethnobotanical research were extracted. Knowledge obtained directly from participants in the studies was included in this review and information on traditional applications of plants cited from the previous literature was not considered. The accuracy of plant names was confirmed using the Plant List (https://wfoplantlist.org, accessed on 20 February 2025) and SANBI websites (http://pza.sanbi.org, accessed on 25 August 2024; http://redlist.sanbi.org accessed 30 September 2024). These platforms were accessed regularly during the data extraction period. As such, unidentified plants reported in the studies were omitted from the data analysis. Descriptive statistics was performed using Microsoft Excel to present graphs and figures relevant to the results retrieved.
4. Conclusions
This study provides evidence of the remedies and ingredients traditionally used for wound treatment from 27 ethnobotanical studies. Because much of the indigenous knowledge of the use of traditional medicines has been lost and some plant species face extinction if not appropriately propagated and protected, South Africa has implemented strategies to protect its vast array of medicinal plants to ensure their sustainability for the future. Further reporting of plant species not covered in the previous studies is warranted.
The use of plants as an alternate treatment strategy has become increasingly important given the lack of access to appropriate antibiotics, which is a key factor in driving antimicrobial resistance [96]. The ability of infecting microbes to form biofilms, combined with the rapid increase in antimicrobial resistance, hampers the effective treatment of wounds. Most pharmaceutical antimicrobials do not penetrate microbial biofilms efficiently, creating a need for new strategies for wound management. Considering the antimicrobial potential of various plant-based products, the ability of plants to prevent biofilm formation, while also promoting tissue healing is worth further exploration [97].
Composed of several bioactive compounds with anti-inflammatory, antimicrobial, and healing properties [98,99], medicinal plants have, over time, developed mechanisms to identify and defend against invading pathogens [99,100]. Exploring their different mechanisms, bioavailability, and properties to develop new antimicrobials with low minimal inhibitory concentrations will contribute significantly to the search for novel, low-cost alternative therapies to address the problem of antimicrobial resistance, while simultaneously preserving mammalian cells and complementing the existing indigenous knowledge.
Globally, the efficacy of plants with wound-healing properties has been well established and various patented plant formulations have led to commercialisation [101,102]. Aloe vera is an example of a plant that has undergone clinical trials proving its wound-healing capability [103], thereby leading to product development. Most botanicals identified in this review have demonstrated beneficial properties in vitro [65,69,70,71,74,75,76]. However, their clinical investigation is limited. As with the assessment of any drug, these medicinal plants warrant clinical trials to fully comprehend their therapeutic benefits and to determine any possible side effects, such as allergic reactions.
A limitation of this review is that the evidence presented comprised studies with a significant percentage of missing data for the outcomes assessed. Information provided by the participants may have differed from those that did not report, thereby limiting this review in providing a comprehensive report of the plants used to treat wounds in South Africa. Nevertheless, this paper presents valuable results adding to a limited pool of information and contributes to a global database of South African plant species with wound-healing properties.
Author Contributions
Conceptualization, F.F.; methodology, F.F.; investigation, F.F., R.F., C.A. and J.K.; writing—original draft preparation, F.F.; writing—review and editing, F.F., C.A., R.F. and J.K.; funding acquisition, F.F. All authors have read and agreed to the published version of the manuscript.
Funding
This paper was supported financially by the National Research Foundation of South Africa [Grant number: 138390]. Any opinion, findings, and conclusions or recommendations reported in this paper are those of the authors and therefore the NRF does not accept any liability in regard thereto.
Data Availability Statement
No new research data was created. All data was retrieved from published articles available to the public from various databases outlined in the Section 3 of the paper.
Acknowledgments
The authors wish to acknowledge student researchers, Banele Ndlovu, Lisa Joorst, Chenicke Matthys, Jamie-Lee Fisher, and Lubna Mohamed Elmahaishi for their assistance with the literature searches.
Conflicts of Interest
The authors declare no conflicts of interest.
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