Biochemical properties of rice wine produced from three different starter cultures

Abstract

Starter cultures influence aroma and flavour in rice wine production. The biochemical characterization of rice wine produced from common and glutinous rice using three starter cultures; 1) bitter (1.51x105 CFU/g), 2) bitter-sweet (5.5x104 CFU/g), and 3) sweet (4.47x105 CFU/g), were investigated. The volume of wine, with pH ranging from 4.3 to 4.7, obtained from glutinous rice was twice the volume of common rice. Glucose levels of wine from glutinous rice ranged between 300.27±0.28 ~ 440.14±29.97 mg/ml, twice of that in common rice wine. The wine from common rice contained higher alcohol (9.96±0.08 ~ 12.53±1.35%) as compared to wine from glutinous rice. Volatile hydrocarbons in both rice wines were analysed and reported. Rice wine and fermented rice cakes were tested for their antioxidant and fibrinolytic activities. However, only fermented rice cakes from common rice displayed positive antioxidant and fibrinolytic activities. Best fibrinolytic activity was exhibited by a bitter-sweet starter with IC50 4.67±0.51 mg/ml and 0.32±0.01 unit plasmin/mg.