Antioxidant components and antioxidant activities of methanolic extract from adzuki beans (Vigna angularis var. nipponensis).

摘要

The antioxidant compounds and antioxidant activities of adzuki beans were determined to evaluate their functional properties and to compare them to Daepung and Taekwang. Proximate composition and mineral contents of the various adzuki bean cultivars studied were not significantly different. A high level of dietary fibre (14.81%) was found in cv. Chilbopat. The extraction yields of Daepung and Taekwang were 38.70 and 34.61%, respectively; however the yields of the various adzuki beans were lower at 13.78-20.76%. The total polyphenols and flavonoids content of the various adzuki beans cultivars were 19.00-34.75 and 12.97-28.95 mg/g, respectively (values for Daepung were 14.40 and 3.96 mg/g, and for Taekwang 10.7 and 2.61 mg/g). High levels of polyphenols (34.75 mg/g) and flavonoids (28.95 mg/g) were found in cv. Miryang 6. The total anthocyanin and proanthocyanidin contents of the various adzuki beans ranged from 5.89-23.77 and 1.83-3.29 mg/g, respectively. A high level of total tocopherols content (7.66 mg/100 g) was found in cv. Yungum-pat. High levels of ABTS radical (2.44 mg TEAC/mg extract residue) and DPPH radical scavenging activities (4.46 mg TEAC/mg extract residue) were found in cv. Miryang 6. A significant correlation was also noted between free radical scavenging activity and polyphenolic compound content. The results of this study suggest that notable antioxidant activities in various adzuki bean cultivars could have significant health benefits.