Journal ArticleDOI
HPLC method for evaluation of the free radical-scavenging activity of foods by using 1,1-diphenyl-2-picrylhydrazyl
TLDR
An HPLC method using 1,1-diphenyl-2-picrylhydrazyl (DPPH) determined the free radical-scavenging activity of several antioxidants: ascorbic acid, alpha-tocopherol, Trolox, and cysteine, and the results well agree with those of previous reports.Abstract:
An HPLC method for evaluation of the free radical-scavenging activity of foods by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) is reported. The activity was evaluated by measuring the decrease of DPPH detected at 517 nm. By using this novel method, we determined the free radical-scavenging activity of several antioxidants: ascorbic acid, α-tocopherol, Trolox, and cysteine. The results gave good correlation between the radical-scavenging activity determined by HPLC and by conventional colorimetry. This methodology was applied to determine the free radical-scavenging activity of 8 beverages. The activity of coffee was the highest, followed by red wine, green tea, oolong tea, black tea, rose wine, white wine, and orange juice. The results well agree with those of previous reports. This method is expected to be useful for a simple and rapid determination of free radical-scavenging activity in colored foods, because coloring substances in foods do not interfere with the measurement.read more
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Hollow selenium nanoparticles from potato extract and investigation of its biological properties and developmental toxicity in zebrafish embryos.
TL;DR: The results of this study indicate that potato extract reduces the toxicity of hSeNPs and lower concentrations of h SeNPs could be used for various biomedical applications in near future.
Journal ArticleDOI
Synthesis, antioxidant, and xanthine oxidase inhibitory activities of 5-[4-[2-(5-ethyl-2-pyridinyl)ethoxy]phenyl]methyl]-2,4-thiazolidinedione derivatives.
A. Bushra Begum,Muneera Begum,V. Lakshmi Ranganatha,T. Prashanth,Farhan Zameer,Raghavendra Hegdekatte,Shaukath Ara Khanum +6 more
TL;DR: The synthesis of N‐substituted analogs of thiazolidinedione derivatives as effective and new class of XO inhibitors and also as antioxidant agents are reported.
Journal ArticleDOI
Electron spin resonance as a powerful tool for studying antioxidants and radicals.
G. Barriga-González,Benjamín Aguilera-Venegas,Christian Folch-Cano,F. Pérez-Cruz,Claudio Olea-Azar +4 more
TL;DR: The ORAC-ESR assay, based on the spin trapping technique, emerges as an interesting tool for identifying and quantifying the antioxidant capacity of different samples and allows us to characterize radicals in in vivo/ex vivo models.
Journal ArticleDOI
Radical Scavenging and Antioxidant Activities of Fermented Laminaria japonica Extracts
Min-Jung Park,Ji-Sook Han +1 more
TL;DR: In this article, the authors evaluated the radical scavenging and antioxidant activities of Laminaria japonica and fermented its extracts and concluded that fermented L. Japonica is a healthy food having radicals and antioxidants.
Journal ArticleDOI
Modulatory effect of moringa oleifera against gamma-radiation-induced oxidative stress in rats
TL;DR: In this article, the authors investigated the antioxidant activity and the protective effects of the aqueous leaf extract of Moringa oleifera (MO) on α-radiation-induced toxicity in cardiac and pulmonary tissues in rats.
References
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Antioxidant Determinations by the Use of a Stable Free Radical
TL;DR: In this paper, the chemical nature of the antioxidant is known and a test specific for the compound or group of interest; for example, the nitroprusside test for sulphydryl groups.
Journal ArticleDOI
Dietary antioxidant flavonoids and risk of coronary heart disease: the Zutphen Elderly Study.
TL;DR: Flavonoids in regularly consumed foods may reduce the risk of death from coronary heart disease in elderly men and showed an inverse relation with incidence of myocardial infarction.
Journal ArticleDOI
Wine, alcohol, platelets, and the French paradox for coronary heart disease
Serge Renaud,M de Lorgeril +1 more
TL;DR: Data from Caerphilly, Wales, show that platelet aggregation, which is related to CHD, is inhibited significantly by alcohol at levels of intake associated with reduced risk of CHD.
Journal ArticleDOI
The occurrence of superoxide anion in the reaction of reduced phenazine methosulfate and molecular oxygen
TL;DR: The reduction of nitro blue tetrazolium (NitroBT) with NADH mediated by phenazine methosulfate (PMS) under aerobic conditions was inhibited upon addition ofsuperoxide dismutase, indicating the involvement of superoxide aninon radical in the reduction of NitroBT.
Journal ArticleDOI
Antioxidant activity of various tea extracts in relation to their antimutagenicity
Gow-Chin Yen,Hui-Yin Chen +1 more
TL;DR: The relationship between antioxidant activity and antimutagenicity of various tea extracts (green tea, pouchong tea, oolong tea and black tea) was investigated in this article, which showed that all tea extracts exhibited markedly antioxidant activity.