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  • Title: High performance liquid chromatographic determination of methapyrilene hydrochloride in feed and sleep aid tablets.
    Author: Shaikh B, Hallmark MR.
    Journal: J Assoc Off Anal Chem; 1981 Jul; 64(4):889-92. PubMed ID: 7275906.
    Abstract:
    Methapyrilene hydrochloride (MP-HCl) was extracted from feed with methanol and determined by reverse phase partition chromatography in less than 15 min, using isocratic elution with acetonitrile-1.1% ammonium carbonate (1 + 1) as the mobile phase. This procedure was tested on feed treated with MP-HCl at levels of 125, 500, and 2000 ppm. Recoveries were 104, 95, and 96% with coefficients of variation of 2.4, 1.6, and 0.6%, respectively. MP-HCl in feed was stable for 14 days. This method was also successfully used to determine MP-HCl in 3 sleep aid tablets.
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