Purpose: To evaluate protein hydrolysates and membrane ultrafiltration fractions of blue-spotted stingray for metal chelating and radical scavenging activities, as well as protection against oxidative protein damage. Methods: Stingray protein isolates were hydrolysed with alcalase, papain and trypsin for 3 h. Alcalase hydrolysate was fractionated by membrane ultrafiltration to yield < 3, 3 10 a...

This study was aimed at evaluating the antioxidant activities of methanol extract of Thamnolia vermicularis. The antioxidant activity, reducing power, superoxide anion radical scavenging and free radical scavenging activities were studied. The antioxidant activity of the extract correlated with its concentration (0.2~2 mg/ml) in the reaction mixtures containing linoleic acid. Upto 67% of lipid ...

Daylilies (Hemerocallis disticha) are very popular for vegetarian cuisine in Taiwan and have been long used as a nutritious food and/or traditional medicine in Chinese society. Therefore, the antioxidant capacity of daylily flowers was investigated with a number of established in vitro assays. The results showed that DPPH radical scavenging activity, hydrogen peroxide scavenging activity, super...

Three novel 2,3-diaryl indone derivatives, ascomindones A-C (1-3), and two new isobenzofuran derivatives, ascomfurans A (4) and B (5), together with four know compounds (6-9) were isolated from the culture of a mangrove-derived fungus Ascomycota sp. SK2YWS-L. Their structures were elucidated on the interpretation of spectroscopic data. 1 and 4 were further constructed by analysis of X-ray diffr...

Antioxidant activity of defatted methanol extract of D. malabarica bark was studied for its free radical scavenging property on different in vitro models e.g. 1,1-diphenyl-2-picryl hydrazyl (DPPH), nitric oxide, superoxide, hydroxyl radical and lipid peroxide radical model. The extract showed good dose-dependent free radical scavenging property in all the models except in hydroxyl radical inhib...

We investigated whether niacin-related compounds had radical-scavenging activity by electron spin resonance methods. Many compounds, but not trigonelline, had radical-scavenging activity against hydroxyl radicals. However, for the nitric oxide radical and 1,1-diphenyl-2-picrylhydrazyl radical, only nicotinic acid hydrazide and isonicotinic acid hydrazide had scavenging activities. These results...

The aim of the present study was to evaluate the circulating antioxidants such as vitamin C, vitamin E and GSH in arsenic induced toxicity in rats and in vitro free radical scavenging assay. In this investigation, arsenic (5 mg/kg body weight (b.w) was administered orally for 30 days to induce toxicity. Sinapic acid was administered orally (40 mg/kg body weight) for 30 days with oral administra...

The study investigated the perturbation of oxidant-antioxidant balance in brain synaptosomes of diabetic rats and determined the antioxidant and free radical-scavenging property of the Indian bay leaf. Brain synaptosomes were isolated from control and streptozotocin-induced diabetic animals and oxidative stress parameters were assayed. A methanolic extract of bay leaf (BLE) was tested for the p...

In the present study quantification of total phenolic content and evaluation in vitro antioxidant capability five different extracts Digera muricata was carried out by assays. DPPH radical, superoxide hydroxyl radical scavenging activity metal chelating were calculated compared with standard antioxidants. Reducing power extract also determined. All showed good free ability which gets enhanced i...

evening primrose (oenothera biennis) is a biennial flowering plant increasingly cultivated for medicinal use of γ-linolenic acid rich oil of its seeds. in this study, total phenolic and flavonoids content, antioxidant and antimicrobial activity of aceton, ethanolic and metanolic extracts of evening primrose flowers were evaluated. aceton extract had the highest extraction yield, total phenol an...