The activity of urease in microcapsules formed by a symplex membrane from cellulose sulphate and polydimethyldiallyl ammonium chloride is studied and compared with that of free urease in solution. Both free and encapsulated urease exhibits a similar pH optimum. The interaction of urease with cellulose sulphate causes a decrease of the activity down to 35 to 38%. In spite of its lower absolute activity the encapsulated urease shows a higher long time stability than the free urease. The presented immobilization method for urease could be of importance for an active detoxification in uremia.
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