Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1217, Issue 3, Pages 302-306Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2009.11.048
Keywords
Genotoxic impurity; Trace analysis; Coordination ion spray-MS; Chemical derivatization
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Many pharmaceutical genotoxic impurities are neutral molecules. Trace level analysis of these neutral analytes is hampered by their poor ionization efficiency in mass spectrometry (MS). Two analytical approaches including chemical derivatization and coordination ion spray-MS were developed to enhance neutral analyte detection sensitivity. The chemical derivatization approach converts analytes into highly ionizable or permanently charged derivatives, which become readily detectable by MS. The coordination ion spray-MS method, on the other hand, improves ionization by forming neutral-ion adducts with metal ions such as Na+, K+, or NH4+ which are introduced into the electrospray ionization source. Both approaches have been proven to be able to enhance the detection sensitivity of neutral pharmaceuticals dramatically. This article demonstrates the successful applications of the two approaches in the analysis Of four pharmaceutical genotoxic impurities identified in a single drug development program, of which two are non-volatile alkyl chlorides and the other two are epoxides. (C) 2009 Elsevier B.V. All rights reserved.
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