[Possibilities of study of the human plasma cholinesterase variants by affinity electrophoresis].

Affinity electrophoresis has been applied to the study of the multiple molecular forms of three human plasma cholinesterase phenotypes (usual enzyme U, atypical enzyme A and intermediate UA). Electrophoreses were carried out in polyacrylamide gels containing a water-soluble macromolecular derivative of m-amino-(substituted)-phenyltrimethylammonium immobilized within the gel network. Apparent dissociation constants (KD app) were estimated from the mobilities of the enzymes versus ligand concentration. The ratio of KD app values of the molecular forms of phenotypes A and U which is approximately 2 is consistent with the hypothesis that the anionic site is altered in atypical enzyme.