Biochemical modification by microorganism contributes directly to many advantageous properties of products. In recent years, fermentation was observed to serve as an efficient approach to enhance the antioxidant properties of legume products. For instance,reported that soymilk fermented with Lactobacillus rhamnosus could increase isoflavone aglycone with higher antioxidant capacity. Others have reported fermentation of Bacillus subtilis and a culture mixture consisting of Lactobacillus sp., Acetobacter sp., Caccharomyces sp. and Streptomyces sp. generated soy products with enhanced phenolics and antioxidant capacities. Microbial biotransformation of isoflavone has been widely reported and generated aglycone that is considered to have a better bioactive capacity.