Isoflavone Contents and ${\beta}-Glucosidase$ Activities of Soybeans, Meju, and Doenjang

Abstract

This study was conducted to investigate the isoflavone contents of soybeans, Meju, and Doenjang. activities were also determined and characterized in soybeans, Meju, and Doenjang. The total concentration of daidzein was 406 mg/kg of soybeans, 433 mg/kg of Meju, and 538 mg/kg of Doenjang. Aglycones compose 26.03% of total isoflavones in soybeans, 61.96% in Meju, and 107.68% in Doenjang. The total concentration of genistein was 484, 200 and 538 mg/kg of soybeans, Meju and Doenjang, respectively. Aglycones compose 19.49% of total isoflavones in soybeans, 68.52% in Meju, and 85.26% in Doenjang. The activity was detected in soybeans (5.65 units/mg protein), Meju (2.04 units/mg protein), and Doenjang (0.69 units/mg protein). The optimal pH of activities were and the optimal temperature of activities was .