Antioxidant activity of methanol extracts from the Genus Lespedeza

Title
Antioxidant activity of methanol extracts from the Genus Lespedeza
Authors
김상민정유진판철호엄병헌
Keywords
antioxidant activity; Lespedeza genus; medicinal plant; natural antioxidant; total flavonoid; total polyphenol
Issue Date
2010-05
Publisher
한국식품영양과학회지
Citation
VOL 39, NO 5, 769-775
Abstract
The genus Lespedeza belonging to Leguminosae is an annual or perennial herb, which has been used as a Chinese herbal medicine. Antioxidant activity on DPPH ((1,1)-diphenyl-2-picrylhydrazyl) and ABTS (2,2'-azino-bis(3-ethylenebenzothiazoline-6-sulfonic acid) radicals and the contents of total polyphenol and flavonoid were analyzed with 12 methanol extracts from six Lespedeza genus plants with different plant parts. The highest content of total polyphenol was detected in the leaves of Lespedezarobusta (194.6 mg GAE/g), while the highest content of total flavonoid existed in the aerial part of Lespedeza thunbergii var. intermedia (47.9 mg QE/g). Generally, the amounts of polyphenol and flavonoid compounds were higher in the leaves than in the stems. The SC50 value of DPPH radical scavenging activity ranged from 10.16 to 90.94 ppm, of which the strongest activity was determined in the leaves of L. robusta. Most ABTS radical scavenging activities from the investigated methanol extracts were higher than that of L-ascorbic acid, implying the excellent antioxidant activity. The radical scavenging activity in this study showed high correlation with the amount of total polyphenol rather than that of total flavonoid. These data suggest that the methanol extracts from these Lespedeza spp. could be potential candidates for natural antioxidants.
URI
http://pubs.kist.re.kr/handle/201004/37633
ISSN
1226-3311
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KIST Publication > Article
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