Abstract
Abstract A rapid, accurate spectrophotometric method has been developed for the simultaneous determination of heroin, methapyrilene, and quinine in the presence of diluents commonly found in illicit narcotic samples. The absorbance curves for heroin, methapyrilene, and quinine show that at the points of maximum absorption of methapyrilene at 313 mμ and quinine at 348 mμ, methapyrilene and quinine do not seriously interfere with the maximum absorption of heroin at 280 mμ. Also, methapyrilene in dilute acid solution absorbs only slightly at the quinine maximum of 348 mμ. The common diluents such as lactose, mannitol, and starch usually found in illicit heroin mixtures do not interfere. The procedure described is sufficiently accurate for forensic purposes and has the advantage of speed over the extraction methods.
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