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Wang W, Xu C, Li Z, Qiu C, Xu F, Ding CF. Development of dual-photoionization ion trap mass spectrometry and its application for direct analysis of VOCs in fruit aroma. Talanta 2024; 271:125673. [PMID: 38244311 DOI: 10.1016/j.talanta.2024.125673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 01/09/2024] [Accepted: 01/13/2024] [Indexed: 01/22/2024]
Abstract
Photoionization-ion trap mass spectrometry (PI-ITMS) is one of the major directions of mass spectrometer miniaturization because of its great potential for rapid on-site VOCs detection in many cases. Traditionally, PI has always been investigated separately and is restrained by ion transmission structure, so a new structure needs to be designed and investigated for simplifying and improving the ion transmission efficiency. Interestingly, our preliminary experiments found that the signal intensity and mass range can be effectively improved by combing atmospheric pressure photoionization (APPI) and low-pressure photoionization (LPPI). Therefore, in this paper, a new dual photoionization - ion trap mass spectrometry (DPI-ITMS) was developed, explored and used to directly analyze complex VOCs. Compared with traditional single PI configuration, it presents two obvious merits: (1) simplified ion transmission structure, eliminating the need to use deflection electrode to repel ions and avoiding breakdown risk. (2) some missing/weak low m/z ion mass spectral peaks in APPI and some high m/z ion mass spectral peaks in LPPI were improved in DPI detection mode. In addition, by combining multivariate statistical analysis, we preliminary achieved in differentiating fruit types and maturity level. In summary, we concluded that the developed DPI-ITMS has moderate detection sensitivity (limited by the homemade ITMS, 0.1-1 ppmv with RSD of 6.36 %), and the DPI-ITMS configuration can be referenced by future PI-MS, and this study also provides a high-throughput, simple, noninvasive and no chemical contamination solution for analyzing main VOCs in fruit aroma.
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Affiliation(s)
- Weimin Wang
- School of Material Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China; Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, Institute of Mass Spectrometry, Ningbo University, Ningbo, 315211, China
| | - Chuting Xu
- Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200071, China
| | - Zhe Li
- School of Material Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China
| | - Chaohui Qiu
- School of Material Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China
| | - Fuxing Xu
- School of Material Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China; Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, Institute of Mass Spectrometry, Ningbo University, Ningbo, 315211, China.
| | - Chuan-Fan Ding
- School of Material Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China; Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, Institute of Mass Spectrometry, Ningbo University, Ningbo, 315211, China.
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Elkabets O, Neumark B, Amirav A. Sample Injection for Real-Time Analysis (SIRTA) Using GC-MS with Cold EI. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2024; 35:378-385. [PMID: 38234102 PMCID: PMC10853959 DOI: 10.1021/jasms.3c00412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 12/26/2023] [Accepted: 01/03/2024] [Indexed: 01/19/2024]
Abstract
There is a continual demand for advanced methods and instruments for real-time analysis (RTA). Most of the current RTA techniques based on MS involve ambient desorption ionization technology. However, flow injection of liquid extracted samples is another option without added modifications or cost to existing LC-MS instruments. In this work, we introduce a new RTA approach named sample injection for real-time analysis (SIRTA) using GC-MS with Cold EI. In SIRTA, the standard GC column is replaced with a 1 m long 0.1 mm I.D. fused silica capillary that connects the GC injector to the MS transfer-line of Cold EI. Thus, SIRTA with Cold EI imposes no need for any additional instrumentation; hence, it is characterized by zero added cost. Like in flow injection in MS of LC-MS, the sample is dissolved in ∼1 mL methanol or another solvent. Subsequently, the vial is placed in the GC-MS autosampler while using a standard syringe for injection without any GC separation. The analysis takes merely 0.2-0.7 min, ensuring rapid and consecutive analyses. Unlike standard EI, Cold EI enables SIRTA by taking advantage of its fly through open ion source to avoid overwhelming the ion source during the elution of solvents while still providing enhanced molecular ions for nearly all analytes. In this study, we demonstrated SIRTA Cold EI analysis of 12 compounds and 7 mixtures, including various prescription and illicit drugs, cannabis and petroleum samples, and other synthetic organic compounds including those with molecular weight up to 800 g/mol.
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Affiliation(s)
- Oneg Elkabets
- School
of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Benny Neumark
- School
of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Aviv Amirav
- School
of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
- Aviv
Analytical Ltd, 24 Hanagar
Street, Hod Hasharon 4527713, Israel
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3
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Maciel EVS, Pereira dos Santos NG, Vargas Medina DA, Lanças FM. Electron ionization mass spectrometry: Quo vadis? Electrophoresis 2022; 43:1587-1600. [DOI: 10.1002/elps.202100392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 04/05/2022] [Accepted: 04/27/2022] [Indexed: 11/10/2022]
Affiliation(s)
| | | | | | - Fernando Mauro Lanças
- Institute of Chemistry of São Carlos University of São Paulo São Carlos São Paulo Brazil
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Famiglini G, Palma P, Termopoli V, Cappiello A. The history of electron ionization in LC-MS, from the early days to modern technologies: A review. Anal Chim Acta 2021; 1167:338350. [PMID: 34049632 DOI: 10.1016/j.aca.2021.338350] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 02/18/2021] [Accepted: 02/20/2021] [Indexed: 02/06/2023]
Abstract
This review article traces the history of the use of liquid chromatography coupled with mass spectrometry (LC-MS) using electron ionization (EI) from the first attempts up to the present day. At the time of the first efforts to couple LC to MS, 70 eV EI was the most common ionization technique, typically used in gas chromatography-mass spectrometry (GC-MS) and providing highly reproducible mass spectra that could be collated in libraries. Therefore, it was obvious to transport this dominant approach to the early LC-MS coupling attempts. The use of LC coupled to EI-MS is challenging mainly due to restrictions related to high-vacuum and high-temperature conditions required for the operation of EI and the need to remove the eluent carrying the analyte before entering the ion source. The authors will take readers through a journey of about 50 years, showing how through the succession of different attempts it has been possible to successfully couple LC with EI-MS, which in principle appear to be incompatible.
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Affiliation(s)
- Giorgio Famiglini
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino, Urbino, Italy.
| | - Pierangela Palma
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino, Urbino, Italy
| | - Veronica Termopoli
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino, Urbino, Italy
| | - Achille Cappiello
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino, Urbino, Italy.
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5
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Evaluation of a liquid electron ionization liquid chromatography-mass spectrometry interface. J Chromatogr A 2019; 1591:120-130. [PMID: 30660440 DOI: 10.1016/j.chroma.2019.01.034] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 12/20/2018] [Accepted: 01/11/2019] [Indexed: 11/27/2022]
Abstract
Liquid Electron Ionization (LEI), is an innovative liquid chromatography-mass spectrometry (LC-MS) interface that converts liquid HPLC eluent to the gas-phase in a mass spectrometer equipped with an electron ionization (EI) source. LEI extends the electronic spectra libraries access to liquid chromatography, providing a powerful tool in the untargeted approacssh. Negligible matrix effects allow accurate quantitative information. The purpose of this research was to evaluate the main aspects concerning the interfacing process. These fundamental studies were necessary to understand the mechanism of LEI in details, and improve the interfacing process, especially regarding robustness and sensitivity. Hardware components were installed to prevent analytes precipitation, reduce thermal decomposition of sensitive compounds, and to stabilize the nano-flow delivery with different mobile-phase compositions. Particular attention was devoted to insulating the heated vaporization area from the LC part of the system. Experiments were performed to optimize the interface inner capillary dimensions, and other operative parameters, including temperature, gas and liquid flow rates. Test compounds of environmental interest were selected based on molecular weight, thermal stability, volatility, and polarity. Robustness was evaluated with a set of replicated injections and calibration experiments using a soil matrix as a test sample. MRM detection limits in the low-picogram range were obtained for five pesticides belonging to different classes in a soil sample. High-quality electron ionization mass spectra of a mixture of pesticides were also obtained.
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Kruth C, Czech H, Sklorz M, Passig J, Ehlert S, Cappiello A, Zimmermann R. Direct Infusion Resonance-Enhanced Multiphoton Ionization Mass Spectrometry of Liquid Samples under Vacuum Conditions. Anal Chem 2017; 89:10917-10923. [DOI: 10.1021/acs.analchem.7b02633] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Claudia Kruth
- Joint
Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute
of Chemistry, University of Rostock, 18059 Rostock, Germany
| | - Hendryk Czech
- Joint
Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute
of Chemistry, University of Rostock, 18059 Rostock, Germany
| | - Martin Sklorz
- Joint
Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute
of Chemistry, University of Rostock, 18059 Rostock, Germany
- Joint
Mass Spectrometry Centre, Cooperation Group “Comprehensive
Molecular Analytics” (CMA), Helmholtz Zentrum München−German Research Centre for Environmental Health, 85764 Neuherberg, Germany
| | - Johannes Passig
- Joint
Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute
of Chemistry, University of Rostock, 18059 Rostock, Germany
- Joint
Mass Spectrometry Centre, Cooperation Group “Comprehensive
Molecular Analytics” (CMA), Helmholtz Zentrum München−German Research Centre for Environmental Health, 85764 Neuherberg, Germany
| | - Sven Ehlert
- Joint
Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute
of Chemistry, University of Rostock, 18059 Rostock, Germany
- Photonion GmbH, Hagenower Strasse
73, 19061 Schwerin, Germany
| | - Achille Cappiello
- DiSPA,
LC-MS Laboratory, University of Urbino, Piazza Rinascimento 6, 61029 Urbino, Italy
| | - Ralf Zimmermann
- Joint
Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute
of Chemistry, University of Rostock, 18059 Rostock, Germany
- Joint
Mass Spectrometry Centre, Cooperation Group “Comprehensive
Molecular Analytics” (CMA), Helmholtz Zentrum München−German Research Centre for Environmental Health, 85764 Neuherberg, Germany
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Liu C, Zhu Y, Yang J, Zhao W, Lu D, Pan Y. Effects of Solvent and Ion Source Pressure on the Analysis of Anabolic Steroids by Low Pressure Photoionization Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:724-728. [PMID: 28120300 DOI: 10.1007/s13361-016-1581-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 11/28/2016] [Accepted: 12/14/2016] [Indexed: 06/06/2023]
Abstract
Solvent and ion source pressure were two important factors relating to the photon induced ion-molecule reactions in low pressure photoionization (LPPI). In this work, four anabolic steroids were analyzed by LPPI mass spectrometry. Both the ion species present and their relative abundances could be controlled by switching the solvent and adjusting the ion source pressure. Whereas M•+, MH+, [M - H2O]+, and solvent adducts were observed in positive LPPI, [M - H]- and various oxidation products were abundant in negative LPPI. Changing the solvent greatly affected formation of the ion species in both positive and negative ion modes. The ion intensities of the solvent adduct and oxygen adduct were selectively enhanced when the ion source pressure was elevated from 68 to 800 Pa. The limit of detection could be decreased by increasing the ion source pressure. Graphical Abstract ᅟ.
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Affiliation(s)
- Chengyuan Liu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China
| | - Yanan Zhu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China
| | - Jiuzhong Yang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China
| | - Wan Zhao
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China
| | - Deen Lu
- Department of Chemistry, University of California Davis, Davis, CA, 95616, USA
| | - Yang Pan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China.
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Bhardwaj C, Hanley L. Ion sources for mass spectrometric identification and imaging of molecular species. Nat Prod Rep 2014; 31:756-67. [PMID: 24473154 DOI: 10.1039/c3np70094a] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Covering: 2013 The ability to transfer molecular species to the gas phase and ionize them is central to the study of natural products and other molecular species by mass spectrometry (MS). MS-based strategies in natural products have focused on a few established ion sources, such as electron impact and electrospray ionization. However, a variety of other ion sources are either currently in use to evaluate natural products or show significant future promise. This review discusses these various ion sources in the context of other articles in this special issue, but is also applicable to other fields of analysis, including materials science. Ion sources are grouped based on the current understanding of their predominant ion formation mechanisms. This broad overview groups ion sources into the following categories: electron ionization and single photon ionization; chemical ionization-like and plasma-based; electrospray ionization; and, laser desorption-based. Laser desorption-based methods are emphasized with specific examples given for laser desorption postionization sources and their use in the analysis of intact microbial biofilms. Brief consideration is given to the choice of ion source for various sample types and analyses, including MS imaging.
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Affiliation(s)
- Chhavi Bhardwaj
- Department of Chemistry, University of Illinois at Chicago, mc 111, Chicago, IL 60607-7061.
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