Abstract
A sensitive and specific radioimmunoassay is reported for the cholinergic agent, pyridostigmine. Antibodies were raised in rabbits against a conjugate of pyridostigmine and bovine serum albumin. The assay can detect as little as 2 · 5 ng/ ml of drug directly in plasma and tissue homogenates. Structurally similar compounds and major metabolites are not recognized by the antibody. The specificity of the antibody has been confirmed by utilizing high pressure liquid chromatography. Plasma concentration-time profiles and tissue distribution of the drug were determined by this method in rat after intramuscular administration of pyridostigmine.
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