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  • Title: Identification of a propantheline analog in propantheline bromide tablets.
    Author: Ford BL, Wall AK, Johnston MA, Lea AR.
    Journal: J Assoc Off Anal Chem; 1984; 67(5):934-9. PubMed ID: 6501158.
    Abstract:
    A major impurity in a sample of propantheline bromide tablets has been identified as 9-hydroxypropantheline on the basis of the proton magnetic resonance (PMR) and mass spectra (MS). This identification was confirmed by methanolysis of the tablet extract, which yielded a mixture of methyl xanthanoate and methyl 9-hydroxyxanthanoate. A liquid chromatographic (LC) procedure is described which will permit quantitation of 9-hydroxypropantheline bromide in the presence of propantheline bromide, xanthone, and xanthanoic acid.
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