Investigation of isomeric structures in a commercial mixture of naphthenic acids using ultrahigh pressure liquid chromatography coupled to hybrid traveling wave ion mobility-time of flight mass spectrometry

Journal of Chromatography. a
Mahmoud M Yassine, Ewa Dabek-Zlotorzynska

Abstract

The separation of isomeric naphthenic acids (NAs) is of high importance to obtain more detailed and therefore useful information to understand their fate, transport, toxicity and potential removal treatment methodologies. In the current study, the capabilities of the ultrahigh pressure liquid chromatography/traveling wave ion mobility-time of flight mass spectrometry (UPLC/TWIM-TOF-MS) to separate and study different isomeric structures of NAs were investigated. Fifty seven standard compounds belonging to different chemical families of classical NAs were analyzed to obtain their experimental drift times in addition to chromatographic retention time and mass-to-charge information (m/z). These acyclic and cyclic molecules yielded ions with collision cross section (CCS) values ranging from 110 to 210 Å2. The feasibility of the UPLC/TWIM-TOF-MS method to provide a higher degree of confidence in the identification of isomeric structures was evaluated by analyzing the commercial (Sigma-Aldrich) NAs mixture. Identification and structure confirmation of several alicyclic compounds of similar m/z in the NAs mixture were possible by this method. For instance, the presence of previously tentatively identified compounds by the ultrahigh pr...Continue Reading

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Citations

May 31, 2019·Journal of Mass Spectrometry : JMS·Emily A RueRichard B van Breemen

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