The potential role of plant isoflavone in preventing chronic diseases, such as cancer, osteoporosis, and post-menopausal syndrome, has been reported.The daidzin of puerarin is comprised mainly of un-absorbable and biol. inactive glycosides.The bio-availability of glucosides is increased by hydrolysis using β-glucosidase.In addition, intestinal microorganisms can enhance biol. activity through the bio-conversion of isoflavone as a glycoside.In this study, lactic acid bacteria were obtained from the traditional Korean food, 'Kimchi', and the iso flavone-transforming activity was determined from the production of daidzein measured by HPLC.Lactobacillus rham nosus BHN-LAB 76 and the lactic acid, bacterial mixed culture converted approx. 25.5% and 30.0% of daidzin to daidzein under the anaerobic conditions, resp.In addition, the rate of daidzin bioconversion to daidzein (5.47 mg/L/h) with the mixed culture was much higher than the rate of daidzin bioconversion to daidzein (4.38 mg/L/h) by L. rhamnosus BHN-LAB 76.As a result, the rate of daidzin bio-conversion to daidzein by the mixed culture was very high compared to the sole micro-organisms.Therefore, the mixed culture might be useful as a probiotic culture in the manufacture of fermentation foods and functional materials.