Abstract

The esterases of maternal and fetal ovine plasma were characterized and compared early in the third trimester of gestation. Various techniques were used including statistical evaluation of kinetic parameters, gel-filtration and sensitivity to various activators and inhibitors. Maternal esterase activity, expressed in terms of p-nitrophenyl acetate hydrolysis, was found to be 8-fold higher than fetal activity and although both arylesterase and aliesterase appeared to be present in fetal plasma, their contribution to the total activity was relatively small.

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