Journal ArticleDOI
Screening of Brazilian plant extracts for antioxidant activity by the use of DPPH free radical method
Luciana Lopes Mensor,Fábio de Sousa Menezes,Gilda Guimarães Leitão,Alexandre da Silva Reis,Tereza Cristina dos Santos,Cintia S. Coube,Suzana G. Leitão +6 more
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TLDR
As a general rule the ethanol extracts of plants belonging to the Verbenaceae family showed lower EC50 values than the other plant extracts, among the partitions, the more polar ones (ethyl acetate and n‐butanol) are those that generally have higher antioxidant activity (AA).Abstract:
Brazilian plant extracts belonging to 16 species of 5 different families (71 extracts) were tested against the stable DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) free-radical. The ability to scavenge DPPH radical was measured in these experiments by the discoloration of the solution. Ginkgo biloba and rutin, commonly used as antioxidants for medical purposes, were used as standards. Based on our results, we can say that as a general rule the ethanol extracts of plants belonging to the Verbenaceae family showed lower EC50 values than the other plant extracts. Among the partitions, the more polar ones (ethyl acetate and n-butanol) are those that generally have higher antioxidant activity (AA). Copyright © 2001 John Wiley & Sons, Ltd.read more
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Journal ArticleDOI
Antioxidant activity and free radical scavenging capacity between Korean medicinal plants and flavonoids by assay-guided comparison
Chang W. Choi,Sei C. Kim,Soon Seop Hwang,Bong Kum Choi,Hye J. Ahn,Min Y Lee,Sang H Park,Soo Ki Kim +7 more
TL;DR: Among plant extracts, the root bark of Morus alba and the leaf of Saururus chinensis showed stronger SC50 or ID50 values than other plant extracts and showed a protective effect on DNA damage caused by hydroxyl radicals generated from UV-induced photolysis of hydrogen peroxide.
Book ChapterDOI
Phenolic Compounds: Structure, Classification, and Antioxidant Power
TL;DR: The most common in vitro methods used to evaluate antioxidant activity of phenolic compounds are in-vitro methods which are based on single electron transfer reaction or single hydrogen atom transfer reaction as mentioned in this paper.
Journal ArticleDOI
Antioxidant activity of a ginger extract (Zingiber officinale)
TL;DR: In this paper, the antioxidant effect and the total phenols of ginger extract were studied, and the results showed that the ginger extract showed a higher antioxidant activity than quercetin.
Journal Article
Antioxidant activity, phenol and flavonoid contents of 13 citrus species peels and tissues.
TL;DR: Methanolic extracts of 13 commercially available citrus spp.
Journal ArticleDOI
Antioxidant Activities, Total Phenolics and Flavonoids Content in Two Varieties of Malaysia Young Ginger (Zingiber officinale Roscoe)
TL;DR: The medicinal potential of the leaves and young rhizome of Halia Bara is validated and the positive relationship between total phenolics content and antioxidant activities in Zingiber officinale is validated.
References
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Journal ArticleDOI
Use of a Free Radical Method to Evaluate Antioxidant Activity
TL;DR: The antiradical properties of various antioxidants were determined using the free radical 2,2-Diphenyl-1-picrylhydrazyl (DPPH*) in its radical form as discussed by the authors.
Journal ArticleDOI
The antioxidants of higher plants
TL;DR: The evidence supports at least a partial antioxidant role in vivo for many classes of plant metabolite, and many other compounds as potential antioxidants can be inferred by their similarity to synthetic antioxidants of related structure.
Journal ArticleDOI
Scavenging effects of tea catechins and their derivatives on 1,1-diphenyl-2-picrylhydrazyl radical
TL;DR: It is suggested that the galloyl moiety attached to flavan-3-ol at 3 position has a strong scavenging ability on the DPPH radical as well as the ortho-trihydroxyl group in the B ring, which elevates the radical scavenging efficiency above that of the orthosylated group; as has been recognized in other flavonoids such as flavones.
Journal ArticleDOI
Antioxidant properties of hydroxy-flavones.
Nicole Cotelle,Jean-Luc Bernier,Jean-Pierre Catteau,Jean Pommery,Jean-Claude Wallet,Emile M. Gaydou +5 more
TL;DR: Evidence is provided that hydroxy-flavones exhibit interesting antioxidant properties expressed either by the capacity to scavenge free radicals or to competitively inhibit xanthine oxidase (for 7-hydroxy-Flavones), which may be drug candidates for treating pathologies related to free radical oxidation.
Journal ArticleDOI
A Simple Screening Method for Antioxidants and Isolation of Several Antioxidants Produced by Marine Bacteria from Fish and Shellfish
TL;DR: A simple screening method using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and screened bacteria from 16 kinds of marine animals that lived in different environments in the sea to find 112 bacterial isolates-producing antioxidants, strongly suggesting that the bacterial production of the antioxidative compounds is a kind of adaptation to the aerobic conditions.