Post-source decay matrix-assisted laser desorption/ionization mass spectrometric study of tetracyclic 2,3-dihydro-1,5-benzothiazepines |
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Authors: | Kéki Sándor Nagy Lajos Deák György Lévai Albert Zsuga Miklós |
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Institution: | Department of Applied Chemistry, University of Debrecen, H-4010 Debrecen, Hungary. |
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Abstract: | The fragmentation behavior of six tetracyclic 2,3-dihydro-1,5-benzothiazepine derivatives cationized with protons and silver ions under post-source decay (PSD) matrix-assisted laser desorption/ionization (MALDI) conditions is reported. The protonated adduct ions decompose into several structurally important fragment ions, including substituted cyclopropane and benzohydrothiazole cations. Elimination of Ag and H and/or AgH from the silver-cationized adduct ions of these (M+Ag](+)) compounds was observed. It was also found that M+Ag](+) produced silver-depleted fragment ions exclusively. Based on the PSD results a fragmentation pathway is proposed for the M+H](+) and M+Ag](+) precursor ions. |
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