LC-electron capture-APCI(−)-MS determination of nitrobenzoxadiazole derivatives
Literature Information
Publication Date
2003-10-23
DOI
10.1039/B308752B
Impact Factor
4.616
Authors
Heiko Hayen, Nicole Jachmann, Martin Vogel, Uwe Karst
View Original
Abstract
Nitrobenzoxadiazole (NBD) derivatives are determined with limits of detection ranging down to 20 nmol l−1 using liquid chromatography-mass spectrometry (LC-MS) with electron capture (EC) ionisation. An atmospheric pressure chemical ionisation (APCI) interface operated in the negative ion mode is used as ionisation source. Amine derivatives of 4-chloro-7-nitro-2,1,3-benzoxadiazole (NBDCl) as well as the isocyanate derivatives of 4-nitro-7-piperazino-2,1,3-nitrobenzoxadiazole (NBDPZ) have been analysed using this technique. The parameters favouring electron capture mechanisms have been investigated thoroughly under consideration of the competing mechanism of deprotonation to allow a better understanding of the electron capture process and to improve selectivity of the analysis.
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