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KMID : 1234420090370030266
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Korean Journal of Microbiololgy and Biotechnology
2009 Volume.37 No. 3 p.266 ~ p.272
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An Seon-Mi
Jang Han-Su
Kwun In-Sook
Sohn Ho-Yong
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Abstract
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The annual productions of yam and its aerial bulbils are estimated to 5,000 and 2,500 ton, respectively. But the majority of bulbils had been discarded without specific use. In this study, methanol extract and its organic solvent fractions were prepared from bulbils of Dioscorea batatas Decne, and their antimicrobial, antithrombin, and antioxidant activities were evaluated, respectively. The methanol extract contained 58.98% of water-soluble materials as like yam’s extract. But the bulbils’s extract contained 12-folds of total polyphenol and 3.4-folds of total flavonoids compared than yam’s extract, respectively. For antimicrobial activity the hexane and ethylacetate fraction showed strong antibacterial activity at 500 μg/disc concentration against gram-negative and gram-positive bacteria. Antifungal activity was not observed in any fractions. Strong antithrombin activity was found in the hexane fractions. At 4.8 mg/mL concentration thrombin time (TT) was over 300 sec, which is 4-folds extended than the TT of yam. In a while, the ethylacetate fraction showed strong DPPH scavenging activity (IC50 of 38.1 μg/mL), SOD-like activity and reducing power, which are comparable to vitamin C or BHT. Our results suggest that the bulbils of yam as yam tuber have useful bioactivities, such as antibacterial, antithrombosis, and antioxidant activity.
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KEYWORD
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Antimicrobial, antioxidant, antithrombosis, aerial bulbils, Dioscorea batatas Decne
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