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Nontargeted Screening Using Gas Chromatography-Atmospheric Pressure Ionization Mass Spectrometry: Recent Trends and Emerging Potential. Molecules 2021; 26:molecules26226911. [PMID: 34834002 PMCID: PMC8624013 DOI: 10.3390/molecules26226911] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 11/10/2021] [Accepted: 11/12/2021] [Indexed: 01/02/2023] Open
Abstract
Gas chromatography–high-resolution mass spectrometry (GC–HRMS) is a powerful nontargeted screening technique that promises to accelerate the identification of environmental pollutants. Currently, most GC–HRMS instruments are equipped with electron ionization (EI), but atmospheric pressure ionization (API) ion sources have attracted renewed interest because: (i) collisional cooling at atmospheric pressure minimizes fragmentation, resulting in an increased yield of molecular ions for elemental composition determination and improved detection limits; (ii) a wide range of sophisticated tandem (ion mobility) mass spectrometers can be easily adapted for operation with GC–API; and (iii) the conditions of an atmospheric pressure ion source can promote structure diagnostic ion–molecule reactions that are otherwise difficult to perform using conventional GC–MS instrumentation. This literature review addresses the merits of GC–API for nontargeted screening while summarizing recent applications using various GC–API techniques. One perceived drawback of GC–API is the paucity of spectral libraries that can be used to guide structure elucidation. Herein, novel data acquisition, deconvolution and spectral prediction tools will be reviewed. With continued development, it is anticipated that API may eventually supplant EI as the de facto GC–MS ion source used to identify unknowns.
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Dhiman A, Suhag R, Singh A, Prabhakar PK. Mechanistic understanding and potential application of electrospraying in food processing: a review. Crit Rev Food Sci Nutr 2021; 62:8288-8306. [PMID: 34039180 DOI: 10.1080/10408398.2021.1926907] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Electrospraying (ESPR) is a cost effective, flexible, and facile method that has been used in the pharmaceutical industry, and thanks to its wide variety of uses such as bioactive compound encapsulation, micronization, and food product coating, which have received a great attention in the food market. It uses a jet of polymer solution for processing food and food-derived products. Droplet size can be extremely small up to nanometers and can be regulated by altering applied voltage and flow rate. Compared to conventional techniques, it is simple, cost effective, uses less solvent and products are obtained in one step with a very high encapsulation efficiency (EE). Encapsulation provided using it protects bioactives from moisture, thermal, oxidative, and mechanical stresses, and thus provides them a good storage stability which will help in increasing the application of these ingredients in food formulation. This technique has an enormous potential for increasing the shelf life of fruit and vegetables through coating and improvement of eating quality. This study is aimed at overviewing the operating principles of ESPR, working parameters, applications, and advantages in the food sector. The article also covers new ESPR techniques like supercritical assisted ESPR and ESPR assisted by pressurized gas (EAPG) which have high yield as compared to conventional ESPR. This article is enriched with good information for research and development in ESPR techniques for development of novel foods.
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Affiliation(s)
- Atul Dhiman
- Department of Food Science and Technology, College of Agriculture, Punjab Agricultural University, Ludhiana, India
| | - Rajat Suhag
- Department of Food Science Technology, National Institute of Food Technology Entrepreneurship and Management, Sonipat, India
| | - Arashdeep Singh
- Department of Food Science and Technology, College of Agriculture, Punjab Agricultural University, Ludhiana, India
| | - Pramod K Prabhakar
- Department of Food Science Technology, National Institute of Food Technology Entrepreneurship and Management, Sonipat, India
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Jender M, Novo P, Maehler D, Münchberg U, Janasek D, Freier E. Multiplexed Online Monitoring of Microfluidic Free-Flow Electrophoresis via Mass Spectrometry. Anal Chem 2020; 92:6764-6769. [PMID: 32289220 DOI: 10.1021/acs.analchem.0c00996] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Free-flow electrophoresis is a tool for the continuous fractionation of electrically charged analytes. In this study, we introduce a novel method to couple microchip-based free-flow electrophoresis with mass spectrometry. The successive connection of multiple microchip outlets to the electrospray ionization source of a mass spectrometer is automated using a multiposition valve. With this novel setup, it is possible to continuously fractionate and collect compounds while simultaneously monitoring the process online with mass spectrometry. The functionality of the method is demonstrated by the successful separation and identification of the biomolecules AMP, ATP, and CoA, which are fundamental for numerous biochemical processes in every organism.
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Affiliation(s)
- Matthias Jender
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Pedro Novo
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Dominic Maehler
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Ute Münchberg
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Dirk Janasek
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Erik Freier
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
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Kim HJ, Liyanage OT, Mulenos MR, Gallagher ES. Mass Spectral Detection of Forward- and Reverse-Hydrogen/Deuterium Exchange Resulting from Residual Solvent Vapors in Electrospray Sources. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2018; 29:2030-2040. [PMID: 29998361 DOI: 10.1007/s13361-018-2019-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 06/23/2018] [Accepted: 06/23/2018] [Indexed: 05/22/2023]
Abstract
Characterizing glycans is analytically challenging since glycans are heterogeneous, branched polymers with different three-dimensional conformations. Hydrogen/deuterium exchange-mass spectrometry (HDX-MS) has been used to analyze native conformations and dynamics of biomolecules by measuring the mass increase of analytes as labile protons are replaced with deuterium following exposure to deuterated solvents. The rate of exchange is dependent on the chemical functional group, the presence of hydrogen bonds, pH, temperature, charge, and solvent accessibility. HDX-MS of carbohydrates is challenging due to the rapid exchange rate of hydroxyls. Here, we describe an observed HDX reaction associated with residual solvent vapors saturating electrospray sources. When undeuterated melezitose was infused after infusing D2O, samples with up to 73% deuterium exchange were detected. This residual solvent HDX was observed for both carbohydrates and peptides in multiple instruments and dependent on sample infusion rate, infusion time, and deuterium content of the solvent. This residual solvent HDX was observed over several minutes of sample analysis and persisted long enough to alter the measured deuterium labeling and possibly change the interpretation of the results. This work illustrates that residual solvent HDX competes with in-solution HDX for rapidly exchanging functional groups. Thus, we propose conditions to minimize this effect, specifically for top-down, in-electrospray ionization, and quench-flow HDX experiments. Graphical Abstract ᅟ.
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Affiliation(s)
- H Jamie Kim
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX, 76798, USA
| | - O Tara Liyanage
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX, 76798, USA
| | - Marina R Mulenos
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX, 76798, USA
| | - Elyssia S Gallagher
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX, 76798, USA.
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Cha E, Jeong ES, Han SB, Cha S, Son J, Kim S, Oh HB, Lee J. Ionization of Gas-Phase Polycyclic Aromatic Hydrocarbons in Electrospray Ionization Coupled with Gas Chromatography. Anal Chem 2018; 90:4203-4211. [PMID: 29461802 DOI: 10.1021/acs.analchem.8b00401] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, gas-phase polycyclic aromatic hydrocarbons (PAHs) as nonpolar compounds were ionized to protonated molecular ions [M + H]+ without radical cations and simultaneously analyzed using gas chromatography (GC)/electrospray ionization (ESI)-tandem mass spectrometry (MS/MS). The ionization profile, dissociation, and sensitivity were first investigated to understand the significant behavior of gas-phase PAHs under ESI. The formation of protonated molecular ions of PAHs was distinguished according to the analyte phase and ESI spray solvents. The protonated PAHs exhibited characteristic dissociations, such as H-loss, H2-loss, and acetylene-loss, via competition of internal energy. In addition, GC/ESI-MS/MS resulted in relatively lower concentration levels (better sensitivity) for the limits-of-detection (LODs) of PAHs than liquid chromatography (LC)/ESI-MS/MS, and it seems to result from the characteristic ionization mechanism of the gas-phase analyte under ESI. Furthermore, the LODs of gas-phase PAHs depended on molecular weight and proton affinity (PA). Consequently, we demonstrated the relationship among the analyte phases, sensitivities, and structural characteristics (molecular weight and PA) under ESI. The gas-phase PAHs provided enhanced protonation efficiency and sensitivity using GC/ESI-MS/MS, as their molecular weight and PA increased. Based on these results, we offered important information regarding the behavior of gas-phase analytes under ESI. Therefore, the present GC/ESI-MS/MS method has potential as an alternative method for simultaneous analysis of PAHs.
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Affiliation(s)
- Eunju Cha
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
| | - Eun Sook Jeong
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
| | - Sang Beom Han
- Department of Pharmaceutical Analysis, College of Pharmacy , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Korea
| | - Sangwon Cha
- Department of Chemistry , Hankuk University of Foreign Studies , 81 Oedae-ro , Mohyeon-myeon, Cheoin-gu, Yongin-si , Gyeongi-do 17035 , Korea
| | - Junghyun Son
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
| | - Sunghwan Kim
- Department of Chemistry , Kyungpook National University , 80 Daehakro , Buk-gu, Daegu 41566 , Korea
| | - Han Bin Oh
- Department of Chemistry , Sogang University , 35 Baekbeom-ro , Mapo-gu, Seoul 04107 , Korea
| | - Jaeick Lee
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
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Jeong ES, Cha E, Cha S, Kim S, Oh HB, Kwon OS, Lee J. Online Simultaneous Hydrogen/Deuterium Exchange of Multitarget Gas-Phase Molecules by Electrospray Ionization Mass Spectrometry Coupled with Gas Chromatography. Anal Chem 2017; 89:12284-12292. [PMID: 29058415 DOI: 10.1021/acs.analchem.7b03218] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, a hydrogen/deuterium (H/D) exchange method using gas chromatography-electrospray ionization/mass spectrometry (GC-ESI/MS) was first investigated as a novel tool for online H/D exchange of multitarget analytes. The GC and ESI source were combined with a homemade heated column transfer line. GC-ESI/MS-based H/D exchange occurs in an atmospheric pressure ion source as a result of reacting the gas-phase analyte eluted from GC with charged droplets of deuterium oxide infused as the ESI spray solvent. The consumption of the deuterated solvent at a flow rate of 2 μL min-1 was more economical than that in online H/D exchange methods reported to date. In-ESI-source H/D exchange by GC-ESI/MS was applied to 11 stimulants with secondary amino or hydroxyl groups. After H/D exchange, the spectra of the stimulants showed unexchanged, partially exchanged, and fully exchanged ions showing various degrees of exchange. The relative abundances corrected for naturally occurring isotopes of the fully exchanged ions of stimulants, except for etamivan, were in the range 24.3-85.5%. Methylephedrine and cyclazodone showed low H/D exchange efficiency under acidic, neutral, and basic spray solvent conditions and nonexchange for etamivan with an acidic phenolic OH group. The in-ESI-source H/D exchange efficiency by GC-ESI/MS was sufficient to determine the number of hydrogen by elucidation of fragmentation from the spectrum. Therefore, this online H/D exchange technique using GC-ESI/MS has potential as an alternative method for simultaneous H/D exchange of multitarget analytes.
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Affiliation(s)
- Eun Sook Jeong
- Doping Control Center, Korea Institute of Science and Technology , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea
| | - Eunju Cha
- Doping Control Center, Korea Institute of Science and Technology , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea
| | - Sangwon Cha
- Department of Chemistry, Hankuk University of Foreign Studies , 81 Oedae-ro, Mohyeon-myeon, Cheoin-gu, Yongin-si, Gyeongi-do 17035, Korea
| | - Sunghwan Kim
- Department of Chemistry, Kyungpook National University , 80 Daehakro, Buk-gu, Daegu 41566, Korea
| | - Han Bin Oh
- Department of Chemistry, Sogang University , 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Korea
| | - Oh-Seung Kwon
- Doping Control Center, Korea Institute of Science and Technology , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea
| | - Jaeick Lee
- Doping Control Center, Korea Institute of Science and Technology , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea
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Cha E, Jeong ES, Cha S, Lee J. Coupling of gas chromatography and electrospray ionization high resolution mass spectrometry for the analysis of anabolic steroids as trimethylsilyl derivatives in human urine. Anal Chim Acta 2017; 964:123-133. [DOI: 10.1016/j.aca.2017.01.058] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 01/07/2017] [Accepted: 01/13/2017] [Indexed: 10/20/2022]
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Hsu RY, Liao JH, Tien HW, Her GR. Gas chromatography electrospray ionization mass spectrometry analysis of trimethylsilyl derivatives. JOURNAL OF MASS SPECTROMETRY : JMS 2016; 51:883-888. [PMID: 27747993 DOI: 10.1002/jms.3796] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 06/01/2016] [Accepted: 06/01/2016] [Indexed: 06/06/2023]
Abstract
A method based on the analysis of trimethylsilyl (TMS) derivatives by capillary gas chromatography electrospray ionization mass spectrometry (GC-ESI/MS) was proposed. To improve separation, analytes were derivatized to their TMS derivative. During ESI analysis, TMS derivatives may hydrolyze back to their polar native form and are thus suitable for ESI analysis. Several types of analytes were studied to investigate the potential of the approach. Not all TMS derivatives hydrolyzed back to their native form as anticipated. Incomplete hydrolysis was observed for TMS-organic acids and TMS-nonchlorinated phenols. For TMS-chlorophenols, the observation of only the [M - H]- ion suggested that these phenols were hydrolyzed back to their native form. For TMS-beta agonists, the hydrolysis rate was low; therefore, the hydrolysis product was not detected. Both TMS-chlorophenols and TMS-beta agonists provide a sensitivity in the range of low parts per billion (0.25-5 ng/ml and 0.5-10 ng/ml respectively). Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Ren-Yu Hsu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Jhan-Hong Liao
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Hsin-Wen Tien
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Guor-Rong Her
- Department of Chemistry, National Taiwan University, Taipei, Taiwan.
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Tien HW, Ou YM, Hsu RY, Wang TS, Her GR. Letter: The formation of a M + 2 compound in the analysis of a trimethylsilyl derivative of monocarboxylic acids by gas chromatography electrospray ionization mass spectrometry. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2016; 22:145-150. [PMID: 27553737 DOI: 10.1255/ejms.1418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The trimethylsilyl (TMS) derivative is one of the most widely utilized derivatives for analyzing polar compounds by gas chromatography. An ion two mass units higher than the protonated molecular ion was observed in analyzing TMS-monocarboxylic acids by using gas chromatography electrospray ionization mass spectrometry (GC-ESI/MS). The structure of the M + 2 compound was investigated using tandem mass spectrometry and high-resolution mass spectrometry. The results suggest that one methyl group bound to the silicon atom was replaced by a hydroxyl group during the ESI process. One possible mechanism for the formation of the M + 2 compound is proposed. This observation suggests the possibility of synthesizing an organic compound by using ESI.
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Affiliation(s)
- Hsin-Wen Tien
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Yu-Meng Ou
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Ren-Yu Hsu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Tsung-Shing Wang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Guor-Rong Her
- Department of Chemistry, National Taiwan University, Taipei, Taiwan.
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Li DX, Gan L, Bronja A, Schmitz OJ. Gas chromatography coupled to atmospheric pressure ionization mass spectrometry (GC-API-MS): Review. Anal Chim Acta 2015; 891:43-61. [DOI: 10.1016/j.aca.2015.08.002] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 07/20/2015] [Accepted: 08/02/2015] [Indexed: 10/23/2022]
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Reynolds JC, Jimoh MA, Guallar-Hoyas C, Creaser CS, Siddiqui S, Paul Thomas CL. Analysis of human breath samples using a modified thermal desorption: gas chromatography electrospray ionization interface. J Breath Res 2014; 8:037105. [PMID: 25190194 DOI: 10.1088/1752-7155/8/3/037105] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A two-stage thermal desorption/secondary electrospray ionization/time-of-flight mass spectrometry for faster targeted breath profiling has been studied. A new secondary electrospray ionization (SESI) source was devised to constrain the thermal desorption plume and promote efficient mixing in the ionization region. Further, a chromatographic pre-separation stage was introduced to suppress interferences from siloxanes associated with thermal desorption profiles of exhaled breath samples.In vitro tests with 5-nonanone indicated an increased sensitivity and a lowered limit-of-detection, both by a factor of ~4, the latter to an on-trap mass of 14.3 ng, equivalent to a sampled breath concentration of 967 pptv. Analysis of the mass spectrometric responses from 20 breath samples acquired sequentially from a single participant indicated enhanced reproducibility (reduced relative standard deviations (RSD) for 5-nonanone, benzaldehyde and 2-butanone were 28 %, 16% and 14% respectively. The corresponding values for an open SESI source were that 5-nonanone was not detected, with %RSD of 39% for benzaldehyde and 31% for 2-butanone).The constrained source with chromatographic pre-separation resulted in an increase in the number of detectable volatile organic compounds (VOCs) from 260 mass spectral peaks with an open SESI source to 541 peaks with the constrained source with pre-separation. Most of the observed VOCs were present at trace levels, at less than 2.5% of the intensity of the base peak.Seventeen 2.5 dm(3) distal breath samples were collected from asthma patients and healthy controls respectively, and subjected to comparative high-throughput screening using thermal desorption/SESI/time-of-flight mass spectrometry (TD-SESI-ToFMS). Breath metabolites were detected by using a background siloxane ion (hexamethylcyclotrisiloxane m/z 223.0642) as an internal lockmass. Eleven breath metabolites were selected from the breath research literature and successfully targeted. These data reinforce the proposition that TD-SESI-MS has potential for development as a rapid screening method for disease stratification and targeted metabolism profiling.
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Affiliation(s)
- James C Reynolds
- Centre for Analytical Science, Department of Chemistry, Loughborough University, Ashby Road, Loughborough LE11 3TU, UK
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Analysis of anabolic steroids in urine by gas chromatography–microchip atmospheric pressure photoionization-mass spectrometry with chlorobenzene as dopant. J Chromatogr A 2013; 1312:111-7. [DOI: 10.1016/j.chroma.2013.08.098] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 08/01/2013] [Accepted: 08/29/2013] [Indexed: 01/25/2023]
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Kachala VV, Khemchyan LL, Kashin AS, Orlov NV, Grachev AA, Zalesskiy SS, Ananikov VP. Target-oriented analysis of gaseous, liquid and solid chemical systems by mass spectrometry, nuclear magnetic resonance spectroscopy and electron microscopy. RUSSIAN CHEMICAL REVIEWS 2013. [DOI: 10.1070/rc2013v082n07abeh004413] [Citation(s) in RCA: 178] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Suominen T, Haapala M, Takala A, Ketola RA, Kostiainen R. Neurosteroid analysis by gas chromatography–atmospheric pressure photoionization–tandem mass spectrometry. Anal Chim Acta 2013; 794:76-81. [DOI: 10.1016/j.aca.2013.07.055] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 07/19/2013] [Accepted: 07/24/2013] [Indexed: 12/23/2022]
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Vidal-de-Miguel G, Macía M, Pinacho P, Blanco J. Low-sample flow secondary electrospray ionization: improving vapor ionization efficiency. Anal Chem 2012; 84:8475-9. [PMID: 22970991 DOI: 10.1021/ac3005378] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In secondary electrospray ionization (SESI) systems, gaseous analytes exposed to an elecrospray plume become ionized after charge is transferred from the charging electrosprayed particles to the sample species. Current SESI systems have shown a certain potential. However, their ionization efficiency is limited by space charge repulsion and by the high sample flows required to prevent vapor dilution. As a result, they have a poor conversion ratio of vapor into ions. We have developed and tested a new SESI configuration, termed low-flow SESI, that permits the reduction of the required sample flows. Although the ion to vapor concentration ratio is limited, the ionic flow to sample vapor flow ratio theoretically is not. The new ionizer is coupled to a planar differential mobility analyzer (DMA) and requires only 0.2 lpm of vapor sample flow to produce 3.5 lpm of ionic flow. The achieved ionization efficiency is 1/700 (one ion for every 700 molecules) for TNT and, thus, compared with previous SESI ionizers coupled with atmospheric pressure ionization-mass spectrometry (API-MS) (Mesonero, E.; Sillero, J. A.; Hernández, M.; Fernandez de la Mora, J. Philadelphia PA, 2009) has been improved by a large factor of at least 50-100 (our measurements indicate 70). The new ionizer coupled with the planar DMA and a triple quadrupole mass spectrometer (ABSciex API5000) requires only 20 fg (50 million molecules) to produce a discernible signal after mobility and MS(2) analysis.
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Huang MZ, Cheng SC, Cho YT, Shiea J. Ambient ionization mass spectrometry: A tutorial. Anal Chim Acta 2011; 702:1-15. [PMID: 21819855 DOI: 10.1016/j.aca.2011.06.017] [Citation(s) in RCA: 220] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 06/07/2011] [Accepted: 06/07/2011] [Indexed: 10/18/2022]
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Carrasco-Pancorbo A, Nevedomskaya E, Arthen-Engeland T, Zey T, Zurek G, Baessmann C, Deelder AM, Mayboroda OA. Gas chromatography/atmospheric pressure chemical ionization-time of flight mass spectrometry: analytical validation and applicability to metabolic profiling. Anal Chem 2010; 81:10071-9. [PMID: 19924863 DOI: 10.1021/ac9006073] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Gas Chromatography (GC)-Mass Spectrometry (MS) with Atmospheric Pressure (AP) interface was introduced more than 30 years ago but never became a mainstream technique, mainly because of technical difficulties and cost of instrumentation. A recently introduced multipurpose AP source created the opportunity to reconsider the importance of AP ionization for GC. Here, we present an analytical evaluation of GC/APCI-MS showing the benefits of soft atmospheric pressure chemical ionization for GC in combination with a Time of Flight (TOF) mass analyzer. During this study, the complete analytical procedure was optimized and evaluated with respect to characteristic analytical parameters, such as repeatability, reproducibility, linearity, and detection limits. Limits of detection (LOD) were found within the range from 11.8 to 72.5 nM depending on the type of compound. The intraday and interday repeatability tests demonstrate relative standard deviations (RSDs) of peak areas between 0.7%-2.1% and 3.8%-6.4% correspondingly. Finally, we applied the developed method to the analysis of human cerebrospinal fluid (CSF) samples to check the potential of this new analytical combination for metabolic profiling.
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Huang MZ, Yuan CH, Cheng SC, Cho YT, Shiea J. Ambient ionization mass spectrometry. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2010; 3:43-65. [PMID: 20636033 DOI: 10.1146/annurev.anchem.111808.073702] [Citation(s) in RCA: 202] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Mass spectrometric ionization methods that operate under ambient conditions and require minimal or no sample pretreatment have attracted much attention in such fields as biomedicine, food safety, antiterrorism, pharmaceuticals, and environmental pollution. These technologies usually involve separate ionization and sample-introduction events, allowing independent control over each set of conditions. Ionization is typically performed under ambient conditions through use of existing electrospray ionization (ESI) or atmospheric pressure chemical ionization (APCI) techniques. Rapid analyses of gas, liquid, and solid samples are possible with the adoption of various sample-introduction methods. This review sorts different ambient ionization techniques into two main subcategories, primarily on the basis of the ionization processes, that are further differentiated in terms of the approach used for sampling.
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Affiliation(s)
- Min-Zong Huang
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan
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Paz-Schmidt RA, Bonrath W, Plattner DA. Online ESI-MS Analysis of Reactions under High Pressure. Anal Chem 2009; 81:3665-8. [DOI: 10.1021/ac802754q] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Roberto A. Paz-Schmidt
- Institute of Organic Chemistry and Biochemistry, University of Freiburg, Albertstrasse 21, D-79104, Freiburg im Breisgau, Germany, and DSM Nutritional Products Limited, P.O. Box 2676, CH-4002 Basel, Switzerland
| | - Werner Bonrath
- Institute of Organic Chemistry and Biochemistry, University of Freiburg, Albertstrasse 21, D-79104, Freiburg im Breisgau, Germany, and DSM Nutritional Products Limited, P.O. Box 2676, CH-4002 Basel, Switzerland
| | - Dietmar A. Plattner
- Institute of Organic Chemistry and Biochemistry, University of Freiburg, Albertstrasse 21, D-79104, Freiburg im Breisgau, Germany, and DSM Nutritional Products Limited, P.O. Box 2676, CH-4002 Basel, Switzerland
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Moco S, Schneider B, Vervoort J. Plant Micrometabolomics: The Analysis of Endogenous Metabolites Present in a Plant Cell or Tissue. J Proteome Res 2009; 8:1694-703. [DOI: 10.1021/pr800973r] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sofia Moco
- Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, and Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany
| | - Bernd Schneider
- Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, and Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany
| | - Jacques Vervoort
- Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, and Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany
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