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A modification of affinity electrophoresis for preparative purposes is described. This method has been applied to the purification of human erythrocyte carbonic anhydrases B and C. During conventional affinity chromatography some hemoglobin contamination occurs. By introduction of an electrophoretic purification step after the immobilization of carbonic anhydrase to the affinity gel, the hemoglobin impurity is reduced about eight and two times in the preparations of the B and C enzymes, respectively, compared to the enzymes purified by affinity chromatography.
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