摘要：

The immobilization of globular enzymes, cytochrome c (bovine heart), papain (papaya latex) and trypsin (bovine pancreas), in the mesoporous molecular sieve MCM-41 was studied. The physical adsorption in the hexagonal 40 pure silica phase of MCM-41 showed a clear dependence on enzyme size. The efficiency of papain and trypsin immobilization was pH dependent and favorable at pH values 7 and less susceptible to pH changes. Peroxidase (horseradish) was not significantly retained by the MCM-41 support. Silanation of the mesopore openings after trypsin adsorption eliminated the leaching of enzyme into solution at high pH. The entrapped trypsin enzyme was active for the hydrolysis of N -α-benzoyl- dl -arginine-4-nitroanilide (BAPNA). Results for the inhibition of this reaction by poly- l -lysine of various molecular weights are reported. The stability of trypsin was also enhanced by the physical entrapment in MCM-41.

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