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http://dx.doi.org/10.11002/kjfp.2015.22.6.878

Study of antioxidant activities of extracts from Metaplexis japonica leaf and stem  

Hong, Ju-Yeon (Faculty of Herbal Food Cuisine and Nutrition, Daegu Haany University)
Shin, Seung-Ryeul (Faculty of Herbal Food Cuisine and Nutrition, Daegu Haany University)
Publication Information
Food Science and Preservation / v.22, no.6, 2015 , pp. 878-885 More about this Journal
Abstract
The purpose of this study was to evaluate the antioxidant activity of Metaplexis japonica by using hot-water and ethanol extracts of its leaf and stem. Yields of hot-water and ethanol extracts of M. japonica leaf were high at 6.89 and 6.23%, respectively. The polyphenol and flavonoid contents in ethanol extracts of M. japonica leaf (ALEE) were high (86.96 and 60.73 mg/g, respectively). The electron-donating ability of all M. japonica extracts increased with an increase in extract concentration, with the highest electron-donating ability of 36.20~68.19% shown by hot-water extracts of M. japonica leaf (ALWE). The superoxide dismutase (SOD)-like activities of ALWE and ALEE increased with an increase in extract concentration. The nitrite-scavenging ability of the extracts was the highest at pH 1.2 and that of ALWE was higher than that of ALEE. The reducing power of $62.5{\mu}g/mL$ ALEE was 0.09 and that of $1,000{\mu}g/mL$ was 0.44. The inhibitory effect of an ethanol extract of M. japonica stem (ASEE) on tyrosinase was 13.81% at a concentration of $62.5{\mu}g/mL$ and that of $1,000{\mu}g/mL$ ALEE was 57.04%.
Keywords
Metaplexis japonica; leaf; stem; anti-oxidant; functionality;
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Times Cited By KSCI : 6  (Citation Analysis)
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