ADAPTATION OF THE PROCEDURE OF CO-IMMOBILIZATION OF ENZYMES WITH DIFFERENT MODIFICATIONS OF ZEOLITES ON THE SURFACE OF CONDUCTOMETRIC TRANSDUCERS

A comparative study of different parameters of conductometric biosensors based on urease and glucose oxidase, co-immobilized with different types of zeolites. Urease immobilized on silicalite-2 was shown to have better performance than immobilized urease without zeolites. Conductometric biosensor with glucose oxidase co-immobilized with zeolite NH4+-Beta 25 had similar response values compared to immobilized enzyme without zeolite. Immobilization of zeolites NH4+-BEA 30 and H+-BEA 30 together with urease leads to an increase in the response of the biosensor, while the reproducibility of the signal remains unchanged. Biosensors with zeolites with a higher Si/Al ratio were characterized by increased signals. The use of zeolites modified with methylviologen and silver did not give a positive effect.