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Zhang J, Kumar M, Pinto S, Samarasinghe I, Attygalle AB. Differentiation of regioisomers of sulfobenzoic acid by traveling-wave ion mobility mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2024; 59:e5068. [PMID: 38989731 DOI: 10.1002/jms.5068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 05/29/2024] [Accepted: 06/05/2024] [Indexed: 07/12/2024]
Abstract
An ion mobility mass spectrometry (IM-MS) investigation using a Synapt G2 mass spectrometer was conducted to separate anions generated from the three regioisomers of sulfobenzoic acid. The results revealed that the differences in arrival time distributions (ATDs) were inadequate to differentiate the isomers unambiguously. However, the ATD profiles of the product ions, generated by fragmenting the respective mass-selected m/z 201 precursor ions in the Trap region of the three-compartment traveling-wave ion guide of the Synapt G2 mass spectrometer, were distinctly different, enabling definitive differentiation of the isomers. An arrival-time peak for an ion of m/z 157 resulting from the loss of CO2 from the respective precursors was common to all three mobilograms. However, only the profile recorded from the para-isomer exhibited a unique arrival-time peak for an ion of m/z 137, originating from an SO2 loss. Such a peak corresponding to an SO2 loss was absent in the ATD profiles of the ortho- and meta-isomers. Additionally, the mobilogram of the meta-isomer displayed a unique peak at 3.42 ms. Based on its product ion spectrum, this peak was attributed to the bisulfite anion (m/z 81; HSO3-). Previously, this meta-isomer specific m/z 81 ion had been proposed to originate from a two-step process involving the intermediacy of an m/z 157 ion formed by CO2 loss. However, our detailed tandem mass spectrometric experiments suggest that the m/z 81 is not a secondary product but rather an ion that originated from a direct elimination of a benzyne derivative from the m/z 201 precursor ion.
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Affiliation(s)
- Jinxin Zhang
- Center for Mass Spectrometry, Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Meenu Kumar
- Center for Mass Spectrometry, Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Spencer Pinto
- Center for Mass Spectrometry, Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Ishira Samarasinghe
- Center for Mass Spectrometry, Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Athula B Attygalle
- Center for Mass Spectrometry, Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, New Jersey, USA
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Tomlinson ID, May JC, Harris RA, Buck KM, Rosenthal SJ, McLean JA, Hercules DM. Preparation and characterization of discrete mass polyether-based polyurethane oligomers. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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A thorough evaluation of matrix-free laser desorption ionization on structurally diverse alkaloids and their direct detection in plant extracts. Anal Bioanal Chem 2020; 412:7405-7416. [PMID: 32851457 DOI: 10.1007/s00216-020-02872-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 07/16/2020] [Accepted: 08/07/2020] [Indexed: 12/24/2022]
Abstract
Alkaloids represent a major group of natural products (NPs), derived from highly diverse organisms. These structurally varied specialized metabolites are widely used for medicinal purposes and also known as toxic contaminants in agriculture and dietary supplements. While the detection of alkaloids is generally facilitated by GC- or LC-MS, these techniques do require considerable efforts in sample preparation and method optimization. Bypassing these limitations and also reducing experimental time, matrix-free laser desorption ionization (LDI) and related methods may provide an interesting alternative. As many alkaloids show close structural similarities to matrices used in matrix-assisted laser desorption ionization (MALDI), they should ionize upon simple laser irradiation without matrix support. With this in mind, the current work presents a systematic evaluation of LDI properties of a wide range of structurally diverse alkaloids. Facilitating a direct comparison between LDI and ESI-MS fragmentation, all tested compounds were further studied by electrospray ionization (ESI). Moreover, crude plant extracts of Atropa belladonna, Cinchona succirubra, and Colchicum autumnale were analyzed by LDI in order to evaluate direct alkaloid detection and dereplication from complex mixtures. Finally, dose-dependent evaluation of MALDI and LDI detection using an extract of Rosmarinus officinalis spiked with atropine, colchicine, or quinine was conducted. Overall, present results suggest that LDI provides a versatile analytical tool for analyzing structurally diverse alkaloids as single compounds and from complex mixtures. It may further serve various potential applications ranging from quality control to the screening for toxic compounds as well as the build up of MS databases. Graphical abstract.
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Abstract
This review covers the applications of mass spectrometry (MS) and its hyphenated techniques to characterize polyurethane (PU) synthetic polymers and their respective hard and soft segments. PUs are commonly composed of hard segments including methylene bisphenyl diisocyanate (MDI) and toluene diisocyanate (TDI), and soft segments including polyester and polyether polyols. This literature review highlights MS techniques such as electrospray ionization (ESI), matrix assisted laser/desorption ionization (MALDI), ion mobility-mass spectrometry (IM-MS), and computational methods that have been used for the characterization of this polymer system. Here we review specific case studies where MS techniques have elucidated unique features pertaining to the makeup and structural integrity of complex PU materials and PU precursors.
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Affiliation(s)
- Tiffany M Crescentini
- Department of Chemistry, Vanderbilt University, Nashville, TN 37240, USA.,Center for Innovative Technology, Vanderbilt University, Nashville, TN 37240, USA.,Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37240, USA.,Institute for Integrated Biosystems Research and Education, Vanderbilt University, Nashville, TN 37240, USA
| | - Jody C May
- Department of Chemistry, Vanderbilt University, Nashville, TN 37240, USA.,Center for Innovative Technology, Vanderbilt University, Nashville, TN 37240, USA.,Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37240, USA.,Institute for Integrated Biosystems Research and Education, Vanderbilt University, Nashville, TN 37240, USA
| | - John A McLean
- Department of Chemistry, Vanderbilt University, Nashville, TN 37240, USA.,Center for Innovative Technology, Vanderbilt University, Nashville, TN 37240, USA.,Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37240, USA.,Institute for Integrated Biosystems Research and Education, Vanderbilt University, Nashville, TN 37240, USA
| | - David M Hercules
- Department of Chemistry, Vanderbilt University, Nashville, TN 37240, USA
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