Abstract

The effect of temperature on the activity of acid phosphatase [orthophosphoric-monoester phosphohydrolase (acid optimum), EC 3.1.3.2] immobilized as a gel layer on the inner wall of ultrafiltration tubular membranes by both copolymerization/gelation and cogelation has been investigated. Both forms of gel-immobilized enzyme showed fairly good stability, the activation energy of their inactivation being significantly lower than that of the free enzyme and of the heat denaturation of proteins in general. The shear effect on the cogelled enzyme was also studied at different temperatures and Reynolds numbers. The results indicated that the cogelled enzyme is a more convenient form for continuous operation in the tubular membrane reactor (TMR), a reactor configuration particularly suitable for industrial applications.

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