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Investigation of neuroleptics and other aromatic compounds by laser-based ion mobility mass spectrometry

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Abstract

Laser-based ion mobility (IM) spectrometry was used for the detection of neuroleptics and PAH. A gas chromatograph was connected to the IM spectrometer in order to investigate compounds with low vapour pressure. The substances were ionized by resonant two-photon ionization at the wavelengths λ = 213 and 266 nm and pulse energies between 50 and 300 μJ. Ion mobilities, linear ranges, limits of detection and response factors are reported. Limits of detection for the substances are in the range of 1–50 fmol. Additionally, the mechanism of laser ionization at atmospheric pressure was investigated. First, the primary product ions were determined by a laser-based time-of-flight mass spectrometer with effusive sample introduction. Then, a combination of a laser-based IM spectrometer and an ion trap mass spectrometer was developed and characterized to elucidate secondary ion–molecule reactions that can occur at atmospheric pressure. Some substances, namely naphthalene, anthracene, promazine and thioridazine, could be detected as primary ions (radical cations), while other substances, in particular acridine, phenothiazine and chlorprothixene, are detected as secondary ions (protonated molecules). The results are interpreted on the basis of quantum chemical calculations, and an ionization mechanism is proposed.

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Acknowledgments

The authors are grateful for the financial support from the BMBF and the administrative support from the PT Jülich within the framework of the ForMaT II project (FKZ: 03FO1042).

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Correspondence to H.-G. Löhmannsröben.

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Published in the topical collection Photo Ionisation in Mass Spectrometry with guest editor Ralf Zimmermann.

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Brendler, C., Riebe, D., Ritschel, T. et al. Investigation of neuroleptics and other aromatic compounds by laser-based ion mobility mass spectrometry. Anal Bioanal Chem 405, 7019–7029 (2013). https://doi.org/10.1007/s00216-012-6654-7

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  • DOI: https://doi.org/10.1007/s00216-012-6654-7

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