The inhibition of alkaline phosphatase by L-p-bromotetramisole.

A levamisole analogue, the L-p-bromotetramisole is introduced as a potent inhibitor of non-specific alkaline phosphatase. Complete inhibition is achieved cytochemically at a concentration of 0.1 mM in various rat tissues except the intestine, which is not affected. The D-p-bromotetramisole does not influence the alkaline phosphatase activities. Since no effect of the inhibitor is seen on the activities of specific phosphatases, this drug is recommended also as an additive for specific phosphatase media in order to yield the specific activity only.