[Purification of cholinesterase from human serum by affinity chromatography]

The human serum butyrylcholinesterase was rapidly purified with an affinity technique on meta-aminophenyltrimethylammonium-agarose; the ionic strength was 0.25 and the specific elution was achieved with 9-amino-10-methylacridinium. After ion exchange on DEAE-cellulose and molecular filtration, an enzyme purified more than ten thousand times was obtained.