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Research Article

p-Nitrophenetole deethylase activity of rat liver microsomes entrapped in polyelectrolyte capsules

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Pages 1-9 | Received 22 May 1986, Accepted 11 Jun 1986, Published online: 27 Sep 2008
 

Abstract

Liver microsomes from phenobarbital induced rats are entrapped in capsules prepared from polyelectrolytes. A comparative analysis of the deethylase activity against p-nitrophenetole by encapsulated and freely suspended microsomes is carried out. The pH optimum occurs at about 72 for encapsulated as well as free microsomes. The pH activity profile of encapsulated microsomes, however, is strongly flattened. The maximal velocity of entrapped microsomes is about a quarter of that of free microsomes. The Michaelis-Menten constants are virtually equal. Despite of the lowered activity of encapsulated microsomes this kind of immobilization of enzymes may be useful in biotechnology and medicine because mild immobilization conditions like room temperatures and aqueous solutions are realized.

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