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NCUEIR > College of Science > biotech > Periodical Articles >  Item 987654321/13221

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/13221

Title: Evaluation of Antioxidant Activity of Aqueous Extract of Some Selected Nutraceutical Herbs
Authors: Chen, Hui-Yin;Lin, Yuh-Charn;Hsieh, Chiu-Lan
Contributors: 生物技術研究所
Keywords: Psidium guajava L.;Camellia sinensis;Toona sinensis Roem.;Rosemarinus officinalis L.;Antioxidant activity
Date: 2007
Issue Date: 2012-08-07T06:57:25Z
Publisher: Elsevier
Abstract: The objectives of this study were to examine the antioxidant activities and free radical scavenging effects of extracts of aqueous leaves of Psidium guajava L. (PE), Camellia sinensis (GABA tea; CE), Toona sinensis Roem. (TE) and Rosemarinus officinalis L. (RE). Among the four extracts, PE exhibited the strongest efficiency and showed over 50% scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals at the concentration of 100 μg/mL. The reducing power of four nutraceutical herbs was in the order of PE > RE > CE > TE. The antioxidant activities of nutraceutical herbs were evaluated in a liposomes oxidation system promoted by Fe3+/ascorbic acid/H2O2. PE still showed the strongest antioxidant activity and exhibited over 95% inhibition at concentration of 50 μg/mL. The antioxidant activity of TE was still lower than that of other herbal plants; however, it also displayed 89% inhibition at concentration of 250 μg/mL. RE exhibited well inhibitory effects on the UVB-induced oxidation of erythrocyte ghosts at lower concentration (100 μg/mL). However, the protection of PE on the UVB-induced oxidation was significantly raised with increasing the concentrations and reached 95.4% inhibitory effects at concentration of 500 μg/mL. These results show that the tested herbal tea, especially PE could be considered as a natural antioxidant source.
Relation: Food Chemistry, 104(4): 1418-1424
Appears in Collections:[biotech] Periodical Articles

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