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Multiple losses of neutral C(14)H(14) in the tandem mass spectrometry of several perbenzyl ether intermediates in the synthesis of green tea constituents.

Lesimple A, Di Falco M, Richard Y, Lesimple S, Wang Z, Chan TH, Mamer OA

The Mass Spectrometry Unit, McGill University, 740 Dr Penfield, Montreal, QC, Canada, H3A 1A4.

Electrospray and matrix-assisted laser desorption/ionization (MALDI) tandem mass spectrometry (MS/MS) experiments were used to investigate an unusual fragmentation in collision-induced dissociation (CID) of sodiated and potassiated perbenzyl ether intermediates obtained in the total synthesis of gallate ester constituents of green tea. Prominent fragments correspond to multiple sequential losses of neutral C(14)H(14) that were not observed in the protonated and ammoniated species, that instead present fragment ion series in which members are separated by C(7)H(6). High-resolution MALDI quadrupole time-of-flight (Q-TOF) and electrospray-Fourier transform mass spectrometry (FTMS) were used to confirm elemental compositions of these and related ions. Copyright (c) 2005 John Wiley & Sons, Ltd.

Published 7 November 2005 in Rapid Commun Mass Spectrom, 19(22): 3253-8.
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