The Inhibition of Cholinesterases by Alkyl‐phosphates and Alkylphenolphosphates

Fresh oxalated human plasma and washed human red cells, lysed by the addition of four volumes of 0.025 M-NaHCO3, were used as a source of cholinesterase II (pseudo cholinesterase) and cholinesterase I (true cholinesterase) respectively. The activity of the enzyme was estimated by the Warburg technique The enzyme solution was placed in the main compartment