Abstract: When immobilized PLA1, inhibitor can couple amine residues which are important for catalysis or maintaining proteinstructure. Therefore, it can protect amine groups of activating site by binding between glutaradehyde and inactive groups of amineso as to increase activity retention of immobilized enzyme.In addtion, phosphate is shown to be a competive inhibitor of PLA1,and by means of making chart to get the Ki value.

Key words: inhibitor, immobilized PLA1(phospholipase A1)