Abstract
It has been found that the alkaloid caffeine may be quantitatively precipitated from aqueous solution by phosphomolybdic acid. The caffeine phosphomolybdate may be dissolved in acetone and determined colorimetrically at 440 mμ. The method may be applied to samples containing from 1 to 5 mg. of caffeine and possesses several advantages over the official A. O. A. C. iodometric and bromometric methods. Although not specific for caffeine, the reaction furnishes a useful and rapid method for determining small amounts of the alkaloid in the presence of phenacetin and aspirin in APC tablets. A method for the determination of caffeine in APC tablets with recovery data is described.
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