Author： Gay Martha L. White Kevin D. Obermeyer William R. Betz Joseph M. Musser Steven M.
Publisher： AOAC International
ISSN： 1944-7922
Source： Journal of AOAC International, Vol.84, Iss.3, 2001-05, pp. : 761-769
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Abstract
Arapid, isocratic method for the separation of 6 ephedrine-type alkaloids which may occur in dietary supplements was modified to permit quantitation and confirmation by liquid chromatography/mass spectrometry using atmospheric pressure chemical ionization. Several columns and sets of conditions were examined for suitability and the results compared. The use of ion-pairing reagents to enhance resolution is also reported. Mass spectrometric conditions were adjusted to provide sufficient fragmentation for qualitative identification of the analytes. Stable-isotope labeled ephedrine was used as an internal standard for quantitation.
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