Simplified method for preparation of high yield, high purity Factor VIII concentrate

Claim 1

The method of concentrating and purifying Factor VIII consisting essentially of the steps of: collecting cryoprecipitate from about 100 or more liters of frozen plasma; extracting the cryoprecipitate thus collected in from about 2 to about 3 volumes of pyrogen-free water at about 25° C. to 30° C. and about pH 7 for from about 30 to about 60 minutes; removing lipids, denatured proteins and prothrombin complex from the extract solution by adsorption: precipating fibrinogen its denatured and degraded products, without removal of significant amounts of Factor VIII from the resulting low ionic strength liquid extract by cooling the liquid to from about 1° C. to about 2° C. for from about one-half hour to about 2 hours; separating, stabilizing, clarifying and sterilizing the supernatant liquid containing about eighty percent or more of the Factor VIII in the starting material; lyophilizing the stabilized supernatant liquid to produce a Factor VIII concentrate which can be stored for long periods of time and which can be easily reconstituted by dissolution in distilled water or physiologic saline.

Claim 2

The method of concentrating and purifying Factor VIII consisting essentially of the steps of: collecting cryoprecipitate from about 100 or more liters of frozen plasma; extracting the cryoprecipitate thus collected in from about 2 to about 3 volumes of pyrogen-free water at about 25° C. to 30° C. and about pH 7 for from about 30 to about 60 minutes; removing lipids, denatured proteins and prothrombin complex from the extract solution by adsorption: precipating fibrinogen its denatured and degraded products, without removal of significant amounts of Factor VIII from the resulting low ionic strength liquid extract by cooling the liquid to from about 1° C. to about 2° C. for from about one-half hour to about 2 hours; separating, stabilizing, clarifying and sterilizing the supernatant liquid containing about eighty percent or more of the Factor VIII in the starting material; lyophilizing the stabilized supernatant liquid to produce a Factor VIII concentrate which can be stored for long periods of time and which can be easily reconstituted by dissolution in distilled water or physiologic saline.