Article (Périodiques scientifiques)
Gas Phase Reactivity of Isomeric Hydroxylated Polychlorinated Biphenyls.
PALM, Emma Helena; Engelhardt, Josefin; Tshepelevitsh, Sofja et al.
2024In Journal of the American Society for Mass Spectrometry, 35 (5), p. 1021 - 1029
Peer reviewed vérifié par ORBi
 

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Mots-clés :
Collision cross sections; Cross-section values; Fragment ions; Gas-phase reactivity; High resolution mass spectrometry; Hydroxylated polychlorinated biphenyls; Ion mobility spectrometry; OH -; Parent compounds; Spectra's; Structural Biology; Spectroscopy
Résumé :
[en] Identification of stereo- and positional isomers detected with high-resolution mass spectrometry (HRMS) is often challenging due to near-identical fragmentation spectra (MS2), similar retention times, and collision cross-section values (CCS). Here we address this challenge on the example of hydroxylated polychlorinated biphenyls (OH-PCBs) with the aim to (1) distinguish between isomers of OH-PCBs using two-dimensional ion mobility spectrometry (2D-IMS) and (2) investigate the structure of the fragments of OH-PCBs and their fragmentation mechanisms by ion mobility spectrometry coupled to high-resolution mass spectrometry (IMS-HRMS). The MS2 spectra as well as CCS values of the deprotonated molecule and fragment ions were measured for 18 OH-PCBs using flow injections coupled to a cyclic IMS-HRMS. The MS2 spectra as well as the CCS values of the parent and fragment ions were similar between parent compound isomers; however, ion mobility separation of the fragment ions is hinting at the formation of isomeric fragments. Different parent compound isomers also yielded different numbers of isomeric fragment mobilogram peaks giving new insights into the fragmentation of these compounds and indicating new possibilities for identification. For spectral interpretation, Gibbs free energies and CCS values for the fragment ions of 4'-OH-CB35, 4'-OH-CB79, 2-OH-CB77 and 4-OH-CB107 were calculated and enabled assignment of structures to the isomeric mobilogram peaks of [M-H-HCl]- fragments. Finally, further fragmentation of the isomeric fragments revealed different fragmentation pathways depending on the isomeric fragment ions.
Disciplines :
Chimie
Auteur, co-auteur :
PALM, Emma Helena  ;  University of Luxembourg > Luxembourg Centre for Systems Biomedicine (LCSB) > Environmental Cheminformatics ; Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16, 114 18 Stockholm, Sweden
Engelhardt, Josefin;  Department of Environmental Science, Stockholm University, Svante Arrhenius väg 8, 114 18 Stockholm, Sweden
Tshepelevitsh, Sofja ;  Institute of Chemistry, University of Tartu, Ravila 14a, 50411, Tartu, Estonia
Weiss, Jana ;  Department of Environmental Science, Stockholm University, Svante Arrhenius väg 8, 114 18 Stockholm, Sweden
Kruve, Anneli ;  Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16, 114 18 Stockholm, Sweden ; Department of Environmental Science, Stockholm University, Svante Arrhenius väg 8, 114 18 Stockholm, Sweden
Co-auteurs externes :
no
Langue du document :
Anglais
Titre :
Gas Phase Reactivity of Isomeric Hydroxylated Polychlorinated Biphenyls.
Date de publication/diffusion :
01 mai 2024
Titre du périodique :
Journal of the American Society for Mass Spectrometry
ISSN :
1044-0305
eISSN :
1879-1123
Maison d'édition :
American Chemical Society, Etats-Unis
Volume/Tome :
35
Fascicule/Saison :
5
Pagination :
1021 - 1029
Peer reviewed :
Peer reviewed vérifié par ORBi
Organisme subsidiant :
Svenska Forskningsradet Formas
Subventionnement (détails) :
The funding has been generously provided by Swedish Research Council for Sustainable Development grants 2018-02264 and 2020-01511. DFT computations were carried out in the High Performance Computing Center of the University of Tartu.
Disponible sur ORBilu :
depuis le 01 avril 2025

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