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[Effective method of simultaneous extraction from the urine and purification of tissue kallikrein and acid-stable trypsin inhibitor].

A simple preparative procedure is developed for simultaneous isolation from urine of tissue kallikrein and acid stable trypsin inhibitor. The procedure involved adsorption of these proteins on chitosan at pH 5-6 and the subsequent elution with 1 N NH4OH, which enabled to obtain the enzyme and inhibitor with a yield of 80-90% and to purify 10-fold each of these components. Use of chitosan facilitated and simplified distinctly the large scale isolation from urine of the kallikrein and trypsin inhibitor, required for medicinal and diagnostic purposes.