In Vitro Stimulation by Parathion of Porcine Pancreatic Carboxylesterase Activity toward Triacetin

Wehave thus far demonstrated that in vitro phytol, isolated from the unsaponifiable matter of Hizikia fusiformis (Japanese name, hiziki), shows no effect on the typical triacylglycerol lipase (TG-lipase) activity, but shows a remarkable stimulating effect (250 to 300%) on the carboxylesterase (TA-esterase) activity toward triacetin in true solution in crude porcine pancreatic lipase preparation.1 ~3) Retinol has also been shown to possess a strong activating activity, essentially similar to that observed with phytol, on the TA-esterase activity.4) We have further