the present invention relates to a method for recovery and purification of isoamylase by raw starch adsorption method . various raw starches are used to recover the isoamylase produced by a bacterium such as pseudomonas amyloderamosa . the method comprises using raw starch to adsorb isoamylase under conditions suitable for such adsorption and isolating the adsorbed enzyme . the isoamylase adsorption rate varied with the species of raw starch . additionally , raw starch can be recycled .