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Phytochemical Composition and Its Antioxidant Activities
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Phytochemical Composition and Its Antioxidant Activities

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Phytochemistry".

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 13437

Special Issue Editor

Dr. Mihaela Skrt

E-Mail Website
Guest Editor
Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
Interests: extraction of bioactive compounds; polyphenols; antioxidative activity; separation of bioactive compounds; HPLC; stability of bioactive compounds; encapsulation; food waste sources
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The journal Plants will be publishing a Special Issue entitled “Phytochemical Composition and Antioxidant Activities.”

From the beginning of mankind, people have used plants mainly as a source of food but also as a source of different remedies to improve their physical and health statue, although typically without knowing the exact composition of the bioactive compounds in plants. In modern times, scientists have developed increasingly powerful analytical tools and techniques which could give us means to analyse phytochemicals, which are natural plant-derived compounds, and determine their chemical structure, physicochemical properties, and bioactive features. One of the most interesting and controversial features of phytochemicals is their antioxidative activity. Some phytochemicals have been found to have a beneficial effect against oxidative processes which can occur in any biological system or during food-processing, influencing organoleptic and nutrition attributes in foodstuffs and contributing to the shorter shelf-life of various consumer products. Phytochemical antioxidant activities are determined with various spectrophotometric methods, employing different reagents like DPPH  and ABTS radicals, FRAAP assay and other assays, suggesting that vast group of plant-derived compounds, phytochemicals, cannot be so easily compared. Do phytochemicals have a synergistic or antagonistic antioxidant effect? We should also have in mind that environmental conditions and climate can also be important factors when comparing phytochemicals and their antioxidative activities.

Thus, this Special Issue will cover a wide variety of areas, aiming to contribute to the overall knowledge of phytochemical qualitative and quantitative determination as well as phytochemical antioxidative activity determination and their antioxidative effects.

Dr. Mihaela Skrt
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Plants is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • phytochemical extraction
  • phytochemical composition
  • phytochemical determination
  • phytochemical quantification
  • antioxidant activity
  • antioxidative effect

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Published Papers (3 papers)

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Research

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14 pages, 791 KiB  
Article
Phytochemical Content, Antioxidant, Alpha-Glucosidase Inhibitory and Antibacterial Activities of Spineless Cactus Pear Cultivars
by Mologadi B. Mabotja, Sonja L. Venter, Christian P. Du Plooy, Tukayi Kudanga and Stephen O. Amoo
Plants 2021, 10(7), 1312; https://doi.org/10.3390/plants10071312 - 28 Jun 2021
Cited by 9 | Viewed by 3254
Abstract
Variation in cultivars can influence plant biological activities. This study aimed to identify superior cultivars while determining the variability in the phytochemical content, antioxidant, alpha-glucosidase inhibitory and antibacterial activities of cladode extracts from selected spineless Burbank cactus pear (Opuntia ficus-indica and Opuntia [...] Read more.
Variation in cultivars can influence plant biological activities. This study aimed to identify superior cultivars while determining the variability in the phytochemical content, antioxidant, alpha-glucosidase inhibitory and antibacterial activities of cladode extracts from selected spineless Burbank cactus pear (Opuntia ficus-indica and Opuntia robusta) cultivars. Total phenolic and flavonoid contents were determined using the Folin-Ciocalteu and aluminum chloride spectrophotometric methods, respectively. Antioxidant activity was investigated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging and β-carotene linoleic acid assays. Alpha-glucosidase inhibition was determined using a spectrophotometric method and antibacterial activity using a non-polar (petroleum ether) and polar (50% methanol) extracts against two Gram-positive and two Gram-negative bacteria. Significant variation in phytochemical content, antioxidant, antidiabetic and antibacterial activities was observed amongst the cultivars. Alpha-glucosidase inhibitory activity varied widely with IC50 values ranging from 0.06 to 1.85 mg/mL. Radical scavenging activity of Polypoly cultivar was about seven fold higher than that recorded in other cultivars with low activity. Turpin and Berg x Mexican cultivars had the highest total phenolic and flavonoid contents, whilst the non-polar extract of Turpin also exhibited higher antibacterial activity against Bacillus subtilis and Escherichia coli. Sicilian Indian Fig was amongst the cultivars with a higher antioxidant activity, whilst also showing a strong inhibition against B. subtilis and E. coli. Polypoly cultivar demonstrated strong antioxidant and antidiabetic activities while its polar extract showed the highest total antibacterial activity against B. subtilis. The cultivar Malta was superior in terms of its antibacterial potency and efficacy against B. subtilis, Staphylococcus aureus and E. coli. The potential of using spineless cactus pear cladodes as a functional food with antioxidant, antidiabetic and antibacterial properties against pathogenic food spoilage bacteria in place of synthetic compounds was established. The significance of cultivar selection to increase this potential was highlighted. Full article
(This article belongs to the Special Issue Phytochemical Composition and Its Antioxidant Activities)
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15 pages, 3885 KiB  
Article
Phytochemical Screening, Antioxidant and Antibacterial Activities of Pollen Extracts from Micromeria fruticosa, Achillea fragrantissima, and Phoenix dactylifera
by Omar Sadeq, Hamza Mechchate, Imane Es-safi, Mohamed Bouhrim, Fatima zahra Jawhari, Hayat Ouassou, Loubna Kharchoufa, Mashail N. AlZain, Nurah M. Alzamel, Omkulthom Mohamed Al kamaly, Abdelhakim Bouyahya, Amina Benoutman and Hamada Imtara
Plants 2021, 10(4), 676; https://doi.org/10.3390/plants10040676 - 1 Apr 2021
Cited by 44 | Viewed by 5733
Abstract
Pollen is a male flower gametophyte located in the anthers of stamens in angiosperms and a considerable source of compounds with health protective potential. In the present work, phytochemical screening was carried out as well as analysis of the antioxidant and antibacterial properties [...] Read more.
Pollen is a male flower gametophyte located in the anthers of stamens in angiosperms and a considerable source of compounds with health protective potential. In the present work, phytochemical screening was carried out as well as analysis of the antioxidant and antibacterial properties of pollen extracts from Micromeria fruticosa, Achillea fragrantissima, and Phoenix dactylifera growing wild in Palestine. Phytochemical screening examined the total flavonol, flavone and phenolic content. The DPPH (1,2-Diphenyl-1-Picrylhydrazyl) and FRAP (ferric reducing antioxidant power) methods were used to assess antioxidant propriety, and disc diffusion, minimum inhibitory and bactericidal concentration tests were used to test the pollen extract’s antibacterial activity against multidrug-resistant (MDR) clinical isolates. The highest level of total phenolic was found in the extract of Micromeria fruticosa (56.78 ± 0.49 mg GAE (Gallic Acid Equivalent)/g). The flavone and flavonol content of samples ranged from 2.48 ± 0.05 to 8.03 ± 0.01 mg QE (Quercetin Equivalent)/g. Micromeria fruticosa pollen with IC50 values of 0.047 and 0.039 mg/mL in the DPPH and FRAP assays, respectively, showed the greatest radical scavenging action. In addition, this pollen showed a mild antibacterial action against the microorganisms studied, with MICs varying from 0.625 to 10 mg/mL and inhibition diameters ranging from 13.66 ± 1.5 to 16.33 ± 1.5 mm. Full article
(This article belongs to the Special Issue Phytochemical Composition and Its Antioxidant Activities)
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Review

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22 pages, 1722 KiB  
Review
Therapeutic Potential of Lindera obtusiloba: Focus on Antioxidative and Pharmacological Properties
by Md Ezazul Haque, Shofiul Azam, Rengasamy Balakrishnan, Mahbuba Akther and In-Su Kim
Plants 2020, 9(12), 1765; https://doi.org/10.3390/plants9121765 - 13 Dec 2020
Cited by 13 | Viewed by 3694
Abstract
Lindera obtusiloba (LO) BLUME from the genus Lindera (Lauraceae) is a medicinal herb traditionally used in Southeast Asian countries. Indigenously, extracts of different parts of the plant have been used to improve blood circulation and treat allergy, inflammation, rheumatism, and liver diseases. LO [...] Read more.
Lindera obtusiloba (LO) BLUME from the genus Lindera (Lauraceae) is a medicinal herb traditionally used in Southeast Asian countries. Indigenously, extracts of different parts of the plant have been used to improve blood circulation and treat allergy, inflammation, rheumatism, and liver diseases. LO is a rich source of therapeutically beneficial antioxidative phytochemicals, such as flavonoids, butenolides, lignans and neolignans. Moreover, recent studies have unravelled the pharmacological properties of several newly found active constituents of LO, such as anti-inflammatory antioxidants (+)-syringaresinol, linderin A, anti-atherosclerotic antioxidant (+)-episesamin, anti-melanogenic antioxidants quercitrin and afzelin, cytotoxic 2-(1-methoxy-11-dodecenyl)-penta-2,4-dien-4-olide, (2Z,3S,4S)-2-(11-dodecenylidene)-3-hydroxy-4-methyl butanolide, anti-allergic koaburaside, (6-hydroxyphenyl)-1-O-beta-d-glucopyranoside and 2,6-dimethoxy-4-hydroxyphenyl-1-O-beta-d-glucopyranoside and the antiplatelet-activity compound Secolincomolide A. These findings demonstrate that LO can be a potential source of antioxidants and other prospective therapeutically active constituents that can lead to the development of oxidative stress-mediated diseases, such as cardiovascular disorders, neurodegenerative disorders, allergies, inflammation, hepatotoxicity, and cancer. Here, the antioxidant properties of different species of Lindera genus are discussed briefly. The traditional use, phytochemistry, antioxidative and pharmacological properties of LO are also considered to help researchers screen potential lead compounds and design and develop future therapeutic agents to treat oxidative stress-mediated disorders. Full article
(This article belongs to the Special Issue Phytochemical Composition and Its Antioxidant Activities)
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