Separation and structure determination of nicardipine photoproducts by LC-ESI-MS

Shih Ming Chen, Mau Chih Hsieh, Su Hui Chao, E-E Chang, Po Yu Wang, An-Bang Wu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A sample of 0.104 M nicardipine in methanol was photoirradiated with a Philips 400 W UV lamp for 3 h in a photochemical chamber. A total of four major photoproducts were found from the HPLC chromatogram. The same sample was used for taking LC-MS, while eight major photoproducts were observed and the structures elucidated by analyzing the CID patterns of their respective mass spectra. A reaction scheme of nicardipine is proposed that the photochemical reactions occur mainly via oxidation of 1,4-dihydropyridine moiety, following the stepwise photo-reduction of the m-nitro group and demethylation of the ester group at 5-position of the pyridine ring.

Original languageEnglish
Pages (from-to)1008-1012
Number of pages5
JournalBiomedical Chromatography
Issue number9
Publication statusPublished - Sept 2008


  • HPLC
  • LC-MS
  • Nicardipine
  • Photoproducts

ASJC Scopus subject areas

  • Drug Discovery
  • Analytical Chemistry
  • Molecular Biology
  • Biochemistry
  • Clinical Biochemistry
  • Pharmacology


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