METHOD FOR PREPARING HUMAN PLASMIN CONCENTRATE AND PRODUCT FOR ITS USING IN MEDICINE Russian patent published in 2005 - IPC

FIELD: medicine, biotechnology, pharmaceutical industry, veterinary science.

SUBSTANCE: method involves addition of tris-HCl buffer (pH 7.5) containing 0.1 M of lysine and 5 mM of EDTA to the Cohn's fraction followed by incubation and centrifugation. Prepared suspension is incubated with 10% PEG-3000 and after centrifugation the solution is applied onto column with lysine-Sepharose at pH 7.5 and plasminogen is eluted with buffer solution at pH 3.5 containing 0.1 M of glycine, 30 mM of lysine and 5 mM of caprylic acid. Then plasminogen is incubated with streptokinase in tris-buffer (pH 7.5) containing 15 mM of lysine, 10 mM of ε-aminocaproic acid and 50% of glycerol. Then method involves chromatography on column with benzamidine-Sepharose at pH 8.5 and elution with buffer at pH 3.5 containing 0.1 M of glycine, 30 mM of lysine, and the end product is lyophilized that comprises about 30 IU/ml of plasmin with purity above 98%, at least 10 mM of lysine and 10 mM of glycine in an aqueous solution at pH about 3.5. The prepared product shows apyrogenic property, absence of toxicity in experiments in laboratory animals and it doesn't cause allergic or other adverse response reactions in intracutaneous or intravenous administrations, and the preparation doesn't cause defects in the vision field after its an intraorbital route of administration.

EFFECT: improved preparing method, valuable medicinal properties of plasmin.

7 cl, 1 ex