MANUFACTURE OF ALPHA-1-PROTENASE INHIBITOR

    公开(公告)号:JPS62138434A

    公开(公告)日:1987-06-22

    申请号:JP28444586

    申请日:1986-12-01

    Applicant: MILES LAB

    Abstract: There is disclosed an improved method for separating one of alpha-1-proteinase inhibitor (also known as alpha-1 anti-trypsin) and antithrombin-III from an aqueous solution of plasma proteins containing the same, such as from Cohn Fraction IV-1, Cohn Fraction IV, reworks of Cohn Fraction IV and IV-1, Cohn Effluent II & III and Cohn Effluent I. The method includes the steps of first holding an aqueous solution of plasma proteins containing one of alpha-1-proteinase inhibitor and antithrombin-III in a relatively large volume of buffer solution as solvent and at a pH adjusted to be relatively basic when compared to conditions heretofore known, and at a temperature in the range of from 2 - 50° C for a period of about 0·2- 24 hours. Following the above treatment, alpha-1- proteinase inhibitor and antithrombin-III are obtained by applying conventional techniques to the resulting solution. Accordingly, the solution is then mixed with a polyalkylene glycol, e.g. polyethylene glycol, in the range of from as low as 8% to as high as 23% (w/v) based on volume of solution to selectively precipitate unwanted proteins. The alpha-1- proteinase inhibitor is then separated from the supernatant solution by adsorption on an anion exchange resin or by precipitation by further addition of a polyalkylene glycol, e.g. polyethylene glycol. The method of the invention provides an improvement in the yield of alpha-1-proteinase inhibitor.

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