A development of a high performance liquid chromatographic method for the determination of atropine in human plasma is presented. Atropine is extracted from plasma basified with 0. 1N sodium hydroxide using chloroform, subsequently subjected to base hydrolysis, followed by derivatization of the generated tropic acid with 4-bromomethyl-7-methoxycoumarin (Br-Mmc). The derivative produced has a strong blue fluorescence at excitation wavelength of 328 nm and emission cutoff filter of 389 nm.d1-Mandelic acid as internal standard (I. S.) was added after hydrolysis. The chromatographic separation was achieved on a reversed phase ODS column with a mobile phase of 33% acetonitrile in 0. 01M ammonium phosphate buffer (pH 5). The minimum quantitative limit was 125 ng/ml of plasma.
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