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
Citations
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Synthesis, characterization, and antioxidant material activities of organotin (IV) carboxylates with tin-para methoxy benzoic acid
TL;DR: In this paper , the authors compared whether the antioxidant activity of Para Methoxy Benzoic acid (L) and its organotin complexes has increased or decreased using methods of: 2,2-diphenyl-1-picrylhydrazyl (DPPH) and CUPRAC technique for di and tri-organotin(IV) compounds.
Journal ArticleDOI
Changes of Anthocyanins in Black Rice Flours Prepared by Cooking and Pregelatinization
TL;DR: In this paper, the effects of the heat treatments on physical and chemical properties, anthocyanin content, and antioxidant activity were determined in the Thai black rice cultivar, Niew Dam (ND; glutinous type) and Hom Nil (HN; non-glutinous type), were pregelatinized through conventional cooking followed by drum-drying.
Journal ArticleDOI
Efficacy of green onion root extract in cosmetics and skin care products
TL;DR: The results showed that the green onion root extract can improve the moisture retention and whitening effect of the mask and anti-aging, melanin synthesis inhibition, whitening and moisture retention effects.
Total polyphenol contents and antioxidative activity of Ipomoea batatas (sweet potato)
TL;DR: The butanol extract had the highest polyphenol content followed by chloroform, petroleum ether and aqueous extracts as mentioned in this paper, and the butanol extracts had the best antioxidant activity.
Anti-oxidant Potential of Some Selected Plants Having Nutritional Value Used by Tribes of Ganjam District, Odisha-India
Prakash Ku,Bamakanta Garnaik +1 more
TL;DR: In this paper, a study was undertaken to determine the antioxidant acti veity of some of the selected plants like Eleusine coracana, Cephalandra indica and Colocasia esculenta commonly consumed by different tribes of Ganjam, Odisha-India for nutritional purposes using various in vitro models like total phenolic contents, DPPH radical scavengin g, nitric oxide scavenging, superoxide anion scavenging and hydroxyl radical sca venging, reducing power assay and Fe 2+ chelating activity.
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.
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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.
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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.
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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.