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The trypsin-kallikrein inhibitor aprotinin was coupled to (carboxymethyl)dextran derivatives of D-galactose. The conjugates contained 14 and 38 D-galactose residues/mol of protein, respectively. The apparent dissociation constants Ki of the complexes between trypsin and modified aprotinins proved to be one order of magnitude higher than the respective values for native aprotinin. The distribution of the modified aprotinins in rat organs after endocardial injection has been studied. The conjugates of aprotinin with (carboxymethyl)dextran derivatives of D-galactose were characterized by decreased clearance rates; they accumulated in the active form in liver. The accumulation was 2.5-10 times higher than native aprotinin for the time of observation (5 min-2 h).

biological chemistry hoppe-seyler

Carbohydrate-Containing Derivatives of the Trypsin-Kallikrein Inhibitor Aprotinin from Bovine Organs. II. Inhibitor Coupled to the (Carboxymethyl)dextran Derivatives of D-Galactose