Comparative Study of Electron Donating Ability, Reducing Power, Antimicrobial Activity and Inhibition of α-glucosidase by Sorghum bicolor Extracts
2010
Sa, Y.J., Kangwon National University, Chuncheon, Republic of Korea | Kim, J.S., Oriental Bio-herb Research Institute, Kangwon National University, Chuncheon, Republic of Korea | Kim, M.O., Kangwon National University, Chuncheon, Republic of Korea | Jeong, H.J., Kangwon National University, Chuncheon, Republic of Korea | Yu, C.Y., Kangwon National University, Chuncheon, Republic of Korea | Park, D.S., Functional Food and Nutrition Division, Rural Development Administration, Suwon, Republic of Korea | Kim, M.J., Kangwon National University, Chuncheon, Republic of Korea
Electron donating ability (EDA), reducing power, total phenolic contents, total flavonoid contents, antimicrobial activity, and α-glucosidase inhibitory effects of twenty-two sorghum varieties were examined using ethanol extracts (70%, v/v). The electron donationg abilities (EDA) of Mesusu and Bulgeunjangmoksusu (94% at 10 ㎍/mL) indicated higher antioxidant activity compared to those of other varieties and standard antioxidants such as BHT (13%) and BHA (74%). The reducing power of Mesusu (OD∧700=0.71) suggested higher antioxidant activity, which was dependent on sample concentration. Bitjarususu showed the highest content of total phenolics (22.9 mg GAE/g); however, extracts from Heuinsusu exhibited the lowest content of total phenolics (16.4 mg GAE/g). Jangmoksusu showed the highest total flavonolic contents (3.5 mg QE/g), and Sigyeongsusu and Chal (GS) susu displayed the most antibacterial activity (MIC=8 ㎍/mL) against Escherichia coli. Extracts of Bulgeunjangmoksusu, Moktaksusu, and Ginjangmoksusu showed the highest α-glucosidase inhibitory effect (98%) at the concentration of 5 ㎍/mL.
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