SummaryEnzymes can be sorbed on inorganic carriers followed by crosslinking with glutaraldehyde. I n some cases superior results are obtained when the support is precoated with a porous layer of titanium oxide. Immobilized lactase prepared in this way retains essentially all its activity when stored under water a t 23°C for long periods of time and loses activity only slowly while treating cheese whey a t 55°C over the course of several weeks contact time. Furthermore, catalyst activity is unaffected by frequent sanitization. Optimum p H for these immobilized-lactase catalysts (enzyme produced from A . niger) is about 3.0 and optimum temperature is about 60°C. Amyloglucosidase catalase, 1.-asparaginase, and trypsin have also been immobilized by these techniques.

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