Abstract: The enzymatic hydrolysis of soybean saponin sugar－ moiety to produce a new soybean saponin containing low sugar and high activity was studied.To choose good strains,the hydrolysis of seven different glucoside and soybean saponin by enzymes obtained from eight different Aspergillus genus strains was examined.The results were three strains such as A.niger 848s,A,oryzae slows and A.oryzae 39s to produce good enzymes to hydrolyze saponin.The optimal reaction conditions of the enzyme hydrolysis of soybean saponin were:pH5 at 40℃ for 12 hours in the analysis of the TLC and HPLC .However the chemical structure and physiological activity of new saponin needed further investigation.

Key words: Soybean saponin Saponin hydrolysis by enzyme Lower sugar soybean saponin