[Immunoaffinity purification of alpha 1-protease inhibitor from human plasma]

A single-step procedure is described for isolation of alpha 1-inhibitor of proteases (alpha 1-IP) from human blood plasma using affinity chromatography on immunosorbent containing monoclonal antibodies against alpha 1-IP. Activity of the alpha 1-IP preparation, estimated by means of specific trypsin inhibition, was increased 61.1-fold after the chromatography, with a yield of the end product 20%. The preparation of alpha 1-IP obtained exhibited electrophoretic and immunochemical homogeneity.