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Ionization of tocopherols and tocotrienols in atmospheric pressure chemical ionization
Author(s) -
Bartosińska Ewa,
BorsukDe Moor Agnieszka,
Siluk Danuta,
Markuszewski Michał J.,
Wiczling Paweł
Publication year - 2018
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.8124
Subject(s) - atmospheric pressure chemical ionization , chemistry , trolox , ionization , chromatography , mass spectrometry , chemical ionization , ion source , analytical chemistry (journal) , high performance liquid chromatography , ion suppression in liquid chromatography–mass spectrometry , liquid chromatography–mass spectrometry , ion , antioxidant , organic chemistry , antioxidant capacity
Rationale Tocopherols and tocotrienols are chemical compounds insusceptible to the ionization process under atmospheric pressure conditions. Therefore, the selection of the optimal ion source settings for their quantification requires special attention. The aim of this study was to analyse the influence of the APCI source parameters on the response of tocochromanols and two related compounds. Methods Standard solutions of target compounds were injected on the high‐performance liquid chromatography/atmospheric pressure chemical ionization tandem mass spectrometry (HPLC/APCI‐MS/MS) system separately and analysed with 30 randomly selected ion source settings. The obtained responses were modelled by multivariate linear regression with least absolute shrinkage and selection operator. The developed models were used to choose the best APCI conditions. Results Multivariate linear models were built for eight tocochromanols, trolox and BHT. The APCI settings derived from the models did not increase the peak areas obtained for T and T3 during the ionization process. Ionization conditions based on models for trolox and BHT improved analytical responses by 12–36% and 4–32%, respectively. The application of the ion source settings optimal for trolox and BHT to tocochromanols did not result in better analytical responses. Conclusions The ionization pattern of tocochromanols in the APCI source is problematic and should be further investigated. Modelling methodology for response improvement presented in this study can be applied in similar studies.