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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2009; 37(3): 266-272

영여자의 항균, 항혈전 및 항산화 활성 평가

Evaluation of Antimicrobial, Antithrombin, and Antioxidant Activity of Aerial Bulbils of Dioscorea batatas Decne

Seon-Mi Ahn , Han-Su Jang , In-Sook Kwun and Ho-Yong Sohn

Dept. of Food and Nutrition, Andong National University, 1Gyeongbuk Institute for Bioindustry, 2Dept. of Food and Nutrition, Andong National University, 3Dept. of Food and Nutrition, Andong National University

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 ethyl acetate fraction showed strong antibacterial activity at $500{mu}g/disc$ 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 ethyl acetate fraction showed strong DPPH scavenging activity ($IC_{50}$ of $38.1{mu}g/mL$), 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 bio-activities, such as antibacterial, antithrombosis, and antioxidant activity.

Keywords: Antimicrobial, antioxidant, antithrombosis, aerial bulbils, Dioscorea batatas Decne

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