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Wang Y. Recent advances in the application of direct analysis in real time-mass spectrometry (DART-MS) in food analysis. Food Res Int 2024; 188:114488. [PMID: 38823841 DOI: 10.1016/j.foodres.2024.114488] [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: 02/07/2024] [Revised: 04/30/2024] [Accepted: 05/07/2024] [Indexed: 06/03/2024]
Abstract
Direct analysis in real time-mass spectrometry (DART-MS) has evolved as an effective analytical technique for the rapid and accurate analysis of food samples. The current advancements of DART-MS in food analysis are described in this paper. We discussed the DART principles, which include devices, ionization mechanisms, and parameter settings. Numerous applications of DART-MS in the fields of food and food products analysis published during 2018-2023 were reviewed, including contamination detection, food authentication and traceability, and specific analyte analysis in the food matrix. Furthermore, the challenges and limitations of DART-MS, such as matrix effect, isobaric component analysis, cost considerations and accessibility, and compound selectivity and identification, were discussed as well.
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Affiliation(s)
- Yang Wang
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun 130117, China.
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2
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Mathias S, Amerio-Cox M, Jackson T, Douce D, Sage A, Luke P, Sleeman R, Crean C, Sears P. Selectivity of Explosives Analysis with Ambient Ionization Single Quadrupole Mass Spectrometry: Implications for Trace Detection. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2024; 35:50-61. [PMID: 38086767 PMCID: PMC10767746 DOI: 10.1021/jasms.3c00305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 11/03/2023] [Accepted: 11/27/2023] [Indexed: 01/04/2024]
Abstract
Ambient ionization (AI) is a rapidly growing field in mass spectrometry (MS). It allows for the direct analysis of samples without any sample preparation, making it a promising technique for the detection of explosives. Previous studies have shown that AI can be used to detect a variety of explosives, but the exact gas-phase reactions that occur during ionization are not fully understood. This is further complicated by differences in mass spectrometers and individual experimental set ups between researchers. This study investigated the gas-phase ion reactions of five different explosives using a variety of AI techniques coupled to a Waters QDa mass spectrometer to identify selective ions for explosive detection and identification based on the applied ambient ionization technique. The results showed that the choice of the ion source can have a significant impact on the number of ions observed. This can affect the sensitivity and selectivity of the data produced. The findings of this study provide new insights into the gas-phase ion reactions of explosives and could lead to the development of more sensitive and selective AI-based methods for their detection.
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Affiliation(s)
- Simone Mathias
- School
of Chemistry and Chemical Engineering, University
of Surrey, Guildford GU2 7XH, U.K.
| | - Marius Amerio-Cox
- School
of Chemistry and Chemical Engineering, University
of Surrey, Guildford GU2 7XH, U.K.
| | - Toni Jackson
- School
of Chemistry and Chemical Engineering, University
of Surrey, Guildford GU2 7XH, U.K.
| | - David Douce
- Waters
Corporation, Stamford
Avenue, Wilmslow SK9 4AX, U.K.
| | - Ashley Sage
- Waters
Corporation, Stamford
Avenue, Wilmslow SK9 4AX, U.K.
| | - Peter Luke
- Mass
Spec Analytical, Future Space UWE North Gate, Bristol BS34 8RB, U.K.
| | - Richard Sleeman
- Mass
Spec Analytical, Future Space UWE North Gate, Bristol BS34 8RB, U.K.
| | - Carol Crean
- School
of Chemistry and Chemical Engineering, University
of Surrey, Guildford GU2 7XH, U.K.
| | - Patrick Sears
- School
of Chemistry and Chemical Engineering, University
of Surrey, Guildford GU2 7XH, U.K.
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Pacholski P, Schramm S, Progent F, Aubriet F. Differentiation of Four Polyvinylidene Fluoride Polymers Based on Their End Groups by DART-FT-ICR MS and Kendrick Plots. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:2278-2288. [PMID: 37647027 DOI: 10.1021/jasms.3c00202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Nowadays, synthetic polymers are produced and used in many materials for different applications. Matrix-assisted laser desorption/ionization or electrospray mass spectrometry are classically used to investigate them, but these techniques require sample preparation steps, which are not always suitable for the study of insoluble or formulated polymers. Alternatively, direct real-time (DART) ionization analysis may be conducted without sample preparation. Four polyvinylidene fluoride (PVDF) polymers involving the C2H2F2 repeating unit coming from different suppliers have been analyzed by DART Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) in negative-ion mode. The obtained mass spectra systematically displayed an oligomeric distribution between m/z 400 and 1300 of [M - H]-, [M + O2]•-, and [M + NO2]- ions. Kendrick plots were used to ease the identification of PVDF end-groups and establish a difference between the samples. Both commercial PVDF polymers shared the same α+ω end groups formula, which confirmed a similar polymerization process for their synthesis. The two other PVDFs were clearly different from the commercial ones by the occurrence of specific end-groups. MS/MS and MS3 experiments were conducted to obtain structural information on these end-groups.
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Affiliation(s)
- Pierre Pacholski
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université de Lorraine, LCP-A2MC (Laboratoire de Chimie et Physique-Approche Multi-échelles des Milieux Complexes), F-57000 Metz, France
| | - Sébastien Schramm
- Université de Lorraine, LCP-A2MC (Laboratoire de Chimie et Physique-Approche Multi-échelles des Milieux Complexes), F-57000 Metz, France
| | | | - Frédéric Aubriet
- Université de Lorraine, LCP-A2MC (Laboratoire de Chimie et Physique-Approche Multi-échelles des Milieux Complexes), F-57000 Metz, France
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Mathias S, Sears P. Direct analysis in real-time mass spectrometry: Observations of helium, nitrogen and argon as ionisation gas for the detection of small molecules using a single quadrupole instrument. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023; 37:e9521. [PMID: 37055933 PMCID: PMC10909476 DOI: 10.1002/rcm.9521] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/06/2023] [Accepted: 04/06/2023] [Indexed: 05/17/2023]
Abstract
RATIONALE Direct analysis in real time is typically performed using helium as the ionisation gas for the detection of analytes by mass spectrometry (MS). Nitrogen and argon are found with abundance in the air and provide a cheaper and greener alternative to the use of helium as ionisation gas. This study explores the use of helium, nitrogen and argon as ionisation gas for the detection of organic compounds. METHODS Four illicit drugs, two amino acids and five explosives were chosen as target analytes to understand selectivity, sensitivity and linearity when helium, nitrogen or argon was used as the ionisation gas with the direct analysis in real time (DART) source. Analysis was carried out on a Waters Acquity QDa single quadrupole mass spectrometer. RESULTS Calibration curves over the range of 5-100 ng were produced for each analyte using the different ionisation gases to assess the instrument response. Nitrogen gave a higher response to concentration than helium or argon; however, the lowest limits of detection were observed when helium was used. CONCLUSIONS All the target analytes were detected using DART-MS with helium, nitrogen or argon as the ionisation gas. Whereas helium provided the highest sensitivity, nitrogen produced reasonable limits of detection and had good linearity across the concentration range explored, suggesting it provides a greener and cheaper alternative to helium.
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Affiliation(s)
- Simone Mathias
- School of Chemistry and Chemical EngineeringUniversity of SurreyGuildfordUK
| | - Patrick Sears
- School of Chemistry and Chemical EngineeringUniversity of SurreyGuildfordUK
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Du S, Jia H, Xu W, Zhai Y. Field-Gradient-Focusing Ion Guide for Enhanced Transfer Efficiency of Low-Mass Ions. Anal Chem 2023; 95:2079-2086. [PMID: 36632644 DOI: 10.1021/acs.analchem.2c05014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Efficient transmission of low-mass ions in a rough vacuum pressure region has always been a challenging issue in mass spectrometry (MS). In this study, a novel ion guide, namely, field-gradient-focusing ion guide (FGF-IG), was proposed to improve the transfer efficiency of ions, especially low-mass ions in a rough vacuum region. The FGF-IG has 12 electrodes whose surfaces gradually narrowed and tilted inward, and its electric field gradually varies from dodecapole (or multipole) to quadrupole along the ion transfer route. The field radius was gradually decreased from 6 to 2 mm in the multipole region (65 mm in length) and finally remained unchanged as 2 mm in the quadrupole region (20 mm in length). By integrating into a miniature mass spectrometer (mini-MS) with a continuous atmospheric pressure interface, this ion guide was optimized in terms of inlet capillary position, radio frequency amplitude, and direct current voltage applied on it. Results showed that a reduced low-mass discrimination effect and improved efficiency of simultaneously transferring mid and low m/z ions were achieved for FGF-IG compared with a conventional ion funnel. Under optimized conditions, a limit of detection of 1 ng/mL was obtained for both reserpine (m/z 609) and arginine (m/z 175) ions by integrating FGF-IG into the mini-MS. The sensitivity of smaller arginine ions using FGF-IG was enhanced by ∼10 times than that obtained using the conventional ion funnel (10 ng/mL) in comparative experiments. The idea of smooth transfer from dodecapole to quadrupole fields could be extended to other multipole fields, as well as in lab-scale MS instruments.
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Affiliation(s)
- Shiyu Du
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Heyuan Jia
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Wei Xu
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
- Institute of Engineering Medicine, Beijing Institute of Technology, Beijing 100081, China
| | - Yanbing Zhai
- Institute of Engineering Medicine, Beijing Institute of Technology, Beijing 100081, China
- School of Medical Technology, Beijing Institute of Technology, Beijing 100081, China
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Yue H, He F, Zhao Z, Duan Y. Plasma-based ambient mass spectrometry: Recent progress and applications. MASS SPECTROMETRY REVIEWS 2023; 42:95-130. [PMID: 34128567 DOI: 10.1002/mas.21712] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 05/28/2020] [Accepted: 06/02/2020] [Indexed: 06/12/2023]
Abstract
Ambient mass spectrometry (AMS) has grown as a group of advanced analytical techniques that allow for the direct sampling and ionization of the analytes in different statuses from their native environment without or with minimum sample pretreatments. As a significant category of AMS, plasma-based AMS has gained a lot of attention due to its features that allow rapid, real-time, high-throughput, in vivo, and in situ analysis in various fields, including bioanalysis, pharmaceuticals, forensics, food safety, and mass spectrometry imaging. Tens of new methods have been developed since the introduction of the first plasma-based AMS technique direct analysis in real-time. This review first provides a comprehensive overview of the established plasma-based AMS techniques from their ion source configurations, mechanisms, and developments. Then, the progress of the representative applications in various scientific fields in the past 4 years (January 2017 to January 2021) has been summarized. Finally, we discuss the current challenges and propose the future directions of plasma-based AMS from our perspective.
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Affiliation(s)
- Hanlu Yue
- College of Life Sciences, Sichuan University, Chengdu, China
| | - Feiyao He
- College of Life Sciences, Sichuan University, Chengdu, China
| | - Zhongjun Zhao
- School of Chemical Engineering, Sichuan University, Chengdu, China
| | - Yixiang Duan
- College of Life Sciences, Sichuan University, Chengdu, China
- School of Manufacturing Science and Engineering, Sichuan University, Chengdu, China
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Shi L, Habib A, Bi L, Hong H, Begum R, Wen L. Ambient Ionization Mass Spectrometry: Application and Prospective. Crit Rev Anal Chem 2022:1-50. [PMID: 36206159 DOI: 10.1080/10408347.2022.2124840] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2022]
Abstract
Mass spectrometry (MS) is a formidable analytical tool for the analysis of non-polar to polar compounds individually and/or from mixtures, providing information on the molecular weights and chemical structures of the analytes. During the last more than one-decade, ambient ionization mass spectrometry (AIMS) has developed quickly, producing a wide range of platforms and proving scientific improvements in a variety of domains, from biological imaging to quick quality control. These methods have made it possible to detect target analytes in real time without sample preparation in an open environment, and they can be connected to any MS system with an atmospheric pressure interface. They also have the ability to analyze explosives, illicit drugs, disease diagnostics, drugs in biological samples, adulterants in food and agricultural products, reaction progress, and environmental monitoring. The development of novel ambient ionization techniques, such as probe electrospray ionization, paper spray ionization, and fiber spray ionization, employed even at picolitre to femtolitre solution levels to provide femtogram to attogram levels of the target analytes. The special characteristic of this ambient ion source, which has been extensively used, is the noninvasive property of PESI of examination of biological real samples. The results in the current review supports the idea that AIMS has emerged as a pioneer in MS-based approaches and that methods will continue to be developed along with improvements to existing ones in the near future.
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Affiliation(s)
- Lulu Shi
- Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, China
- China Innovation Instrument Co., Ltd, Ningbo, Zhejiang, China
| | - Ahsan Habib
- China Innovation Instrument Co., Ltd, Ningbo, Zhejiang, China
- The Research Institute of Advanced Technologies, Ningbo University, Ningbo, Zhejiang, China
- Department of Chemistry, University of Dhaka, Dhaka, Bangladesh
| | - Lei Bi
- China Innovation Instrument Co., Ltd, Ningbo, Zhejiang, China
- The Research Institute of Advanced Technologies, Ningbo University, Ningbo, Zhejiang, China
| | - Huanhuan Hong
- China Innovation Instrument Co., Ltd, Ningbo, Zhejiang, China
- The Research Institute of Advanced Technologies, Ningbo University, Ningbo, Zhejiang, China
| | - Rockshana Begum
- Department of Chemistry, Shahjalal University of Science and Technology, Sylhet, Bangladesh
| | - Luhong Wen
- China Innovation Instrument Co., Ltd, Ningbo, Zhejiang, China
- The Research Institute of Advanced Technologies, Ningbo University, Ningbo, Zhejiang, China
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Gupta S, Samal N. Application of direct analysis in real-time mass spectrometry (DART-MS) in forensic science: a comprehensive review. EGYPTIAN JOURNAL OF FORENSIC SCIENCES 2022. [DOI: 10.1186/s41935-022-00276-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
As the rate of crime is constantly increasing, the workload on the forensic analyst also piles up. The availability of a limited number of seized samples makes it crucial to directly analyze the sample, thereby preventing wastage in the prior steps of sample preparation. Due to such needs, the forensic community is consistently working on broadening the usage of direct analysis in real-time mass spectrometry (DART-MS). DART-MS is a relatively new technique for rapid mass spectral analysis. Its use for chemical analysis credits its ability to analyze the sample at atmospheric pressure.
Main body
This article gives insight into the ionization mechanisms, data analysis tools, and the use of hyphenated techniques like thermal-desorption-DART-MS, infrared-thermal-desorption-DART-MS, Joule-heating thermal-desorption-DART-MS, etc. This review summarizes the applications of DART-MS in the field of Forensic Science reported from 2005 to 2021. The applications include analysis of drugs, warfare agents, gun-shot residues, ink differentiation, and other forensically relevant samples. The paper also presents the relation between the type of DART-MS technique and the ionization mode used for a particular class of compounds.
Conclusion
The review follows that the high-resolution mass-spectrometers or low-resolution mass-spectrometers systems in the positive or negative mode were highly dependent on the type of analyte under investigation. Drugs, inks, dyes, and paints were mainly analyzed using the positive ionization mode in the HRMS technique. The examinations of fire accelerants predominantly used the positive ionization mode in the LRMS technique. Moreover, the limit of detection values obtained from the qualitative screening of street drugs were of ppb level, indicating high sensitivity of DART-MS. Considering the work done in the past years, there are potential future research needs of this technology, especially in forensic science.
Graphical Abstract
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9
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Rafson JP, Sacks GL. Rapid Analysis of Volatile Phenols from Grape Juice by Immersive Sorbent Sheet Extraction Prior to Direct Analysis in Real-Time Mass Spectrometry (DART-MS). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:12344-12353. [PMID: 34618472 DOI: 10.1021/acs.jafc.1c04197] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Poly(dimethylsiloxane)-based thin-film sorbent sheets (SPMESH) have previously been used for parallel headspace (HS) extraction prior to direct analysis in real-time mass spectrometry (DART-MS) for rapid quantitation of odorants in complex matrices. However, HS-SPMESH extraction is poorly suited for less volatile odorants, e.g., volatile phenols. This report describes modifications to the previous SPMESH extraction device, which make it amenable to parallel extraction of low-volatility analytes from multiwell plates under direct immersion (DI) conditions. Optimization and validation of the DI-SPMESH-DART-MS approach were performed on four volatile phenols (4-ethylphenol, 4-ethylguaiacol, 4-methylguaiacol, and guaiacol) of relevance to the quality of grape juices. Negative-ion mode DART-MS spectra showed a series of oxygenated adducts [M + nO - H]- for all analytes, but isobaric interferences could be limited for three of the four analytes by selecting an appropriate MS/MS transition. Signal suppression from nonvolatiles (sugars, acids) could be overcome by a rinse step. DI-SPMESH-DART-MS analysis of 24 samples could be performed in ∼45 min (30 min extraction, 16 min DART analysis) with 0.5-3 μg/L detection limits in aqueous and model juice solutions. In real grape juices (n = 5 cultivars), good accuracy (72-137%) could be achieved for two of the four volatile phenols initially investigated, 4-ethylphenol and 4-ethylguaiacol. However, poor accuracy was observed for guaiacol in some cultivars, and 4-methylguaiacol could not be quantitated due to interferences with other volatile phenols. Despite these limitations, DI-SPMESH-DART-MS/MS may be useful for prescreening a large number of samples prior to more selective conventional analyses.
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Affiliation(s)
- Jessica P Rafson
- Department of Food Science, Cornell University, Stocking Hall, Ithaca, New York 14853, United States
| | - Gavin L Sacks
- Department of Food Science, Cornell University, Stocking Hall, Ithaca, New York 14853, United States
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Zhang X, Ren X, Chingin K. Applications of direct analysis in real time mass spectrometry in food analysis: A review. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2021; 35:e9013. [PMID: 33277776 DOI: 10.1002/rcm.9013] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 10/16/2020] [Accepted: 11/22/2020] [Indexed: 06/12/2023]
Abstract
RATIONALE Direct analysis in real time (DART) combined with mass spectrometry (MS) detection has become one of the most broadly used analytical approaches for the direct molecular characterization of food samples with regard to their chemical quality, safety, origin, and authentication. The major advantages of DART-MS for food analysis include high chemical sensitivity and specificity, high speed and throughput of analysis, simplicity, and the obviation of tedious sample preparation and solvents. METHODS The recent applications of DART coupled with different mass analyzers, including quadrupole, ion trap, Orbitrap, and time of flight, are discussed. In addition, sample pretreatment methods that have been coupled with DART-MS are discussed. RESULTS We summarize the applications of DART-MS in food science and industry published in the period from 2005 to this date. The applications and analytical characteristics are systematically categorized across the three major types of foods: solid foods, liquid foods, and viscous foods. CONCLUSIONS DART-MS has proved its high suitability for the direct, rapid, and high-throughput molecular analysis of very different food samples with minimal or no sample preparation, thus offering a high-speed alternative to liquid chromatography/mass spectrometry (LC/MS) and gas chromatography/mass spectrometry (GC/MS) approaches that are traditionally employed in food analysis.
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Affiliation(s)
- Xiaoping Zhang
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, China
| | - Xiang Ren
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China
| | - Konstantin Chingin
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, China
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Geballa-Koukoula A, Gerssen A, Nielen MWF. From Smartphone Lateral Flow Immunoassay Screening to Direct MS Analysis: Development and Validation of a Semi-Quantitative Direct Analysis in Real-Time Mass Spectrometric (DART-MS) Approach to the Analysis of Deoxynivalenol. SENSORS (BASEL, SWITZERLAND) 2021; 21:1861. [PMID: 33800036 PMCID: PMC7962121 DOI: 10.3390/s21051861] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/01/2021] [Accepted: 03/04/2021] [Indexed: 02/08/2023]
Abstract
In current food safety monitoring, lateral flow immunoassays (LFIAs) are widely used for rapid food contaminant screening. Recent advances include smartphone readouts, offering semi-quantitative analysis of LFIAs with time, location, and data transfer in case of on-site testing. Following the screening, the next step in the EU regulations is confirmation by, e.g., liquid chromatography-tandem mass spectrometry (LC-MS/MS). In this work, using direct analysis in real time ambient ionization and triple quadrupole MS/MS (DART-QqQ-MS/MS), we achieved rapid confirmation of the identity of the substance(s) causing the LFIA result. In the workflow proposed, an individual performs the (on-site) smartphone LFIA screening, and when the result is suspect, an identification LFIA (ID-LFIA) strip is developed with the same sample extract. The ID-LFIA can be dissociated and rapidly analyzed in a control laboratory with DART-QqQ-MS/MS. The ID-LFIA consists of multiple lines of monoclonal antibodies against the mycotoxin deoxynivalenol, acting as a bioaffinity trap. The ID-LFIA/DART-QqQ-MS/MS approach has been developed and validated, along with the screening smartphone LFIA, and has demonstrated its applicability by analyzing incurred and spiked samples. The developed approach has been critically compared with our previous direct electrospray ionization MS method and was found to provide highly complementary information on the total deoxynivalenol contamination in the sample.
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Affiliation(s)
- Ariadni Geballa-Koukoula
- Wageningen Food Safety Research, Wageningen University and Research, P.O. Box 230, 6700 AE Wageningen, The Netherlands; (A.G.); (M.W.F.N.)
| | - Arjen Gerssen
- Wageningen Food Safety Research, Wageningen University and Research, P.O. Box 230, 6700 AE Wageningen, The Netherlands; (A.G.); (M.W.F.N.)
| | - Michel W. F. Nielen
- Wageningen Food Safety Research, Wageningen University and Research, P.O. Box 230, 6700 AE Wageningen, The Netherlands; (A.G.); (M.W.F.N.)
- Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
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Sisco E, Forbes TP. Forensic applications of DART-MS: A review of recent literature. Forensic Chem 2021; 22:10.1016/j.forc.2020.100294. [PMID: 36575658 PMCID: PMC9791994 DOI: 10.1016/j.forc.2020.100294] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The need for rapid chemical analyses and new analytical tools in forensic laboratories continues to grow due to case backlogs, difficult-to-analyze cases, and identification of previously unseen materials such as new psychoactive substances. To adapt to these needs, the forensics community has been pursuing the use of ambient ionization mass spectrometry, and more specifically direct analysis in real time mass spectrometry (DART-MS), for a wide range of applications. From the inception of DART-MS forensic applications have been researched with demonstrations ranging from drugs of abuse to inorganic gunshot residue to printer inks to insect identification. This article presents a review of research demonstrating the use of DART-MS for forensically relevant samples over the past five years. To provide more context, background on the technique, sampling approaches, and data analysis methods are presented along with a discussion on the potential future and research needs of the technology.
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13
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Yamaguchi M. Thermal desorption and pyrolysis direct analysis in real time mass spectrometry of Nafion membrane. J Appl Polym Sci 2020. [DOI: 10.1002/app.50172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Guo Y, Chi H, Liu X, Sun X, Wang Y, Liu S. Rapid characterization of Schisandra species by using direct analysis in real time mass spectrometry. J Pharm Biomed Anal 2020; 192:113648. [PMID: 33010499 DOI: 10.1016/j.jpba.2020.113648] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 09/09/2020] [Accepted: 09/15/2020] [Indexed: 12/29/2022]
Abstract
Direct analysis in real time ionization source coupled with quadrupole orbitrap mass spectrometry (DART-Q-Orbitrap MS) was applied to analyze the Schisandra chinensis (S. chinensis) and Schisandra sphenanthera (S. sphenanthera) samples. The experimental condition including the ionization gas and gas temperature were optimized to obtain the best performance. The DART-MS analysis was operated using helium at 250 °C. The partial least squares discriminant analysis (PLS-DA) was conducted based on the DART-MS data to explore the differences between S. chinensis and S. sphenanthera samples. The clear separation between groups was observed in the PLS-DA score plot, indicating the chemome diversity of these two samples. Then 8 compounds that contribute most to the sample classification were selected and annotated, and the intensity change tendency of these compounds was similar to that obtained by the high-performance liquid chromatography (HPLC) method. Besides, these two species can also be discriminated by examining the existence of the compound anwulignan at m/z 328.1656 in this study. Our results show that DART-MS is a powerful analytical tool with the merit of rapid analysis speed, easy to handle, low consumption of organic solvent, and has the great potential for rapid detection and discrimination of S. chinensis and S. sphenanthera. It is expected that the established method could provide a rapid, reliable method for the quality assessment of Schisandra species, and expand this method to the analysis of other herbal medicines.
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Affiliation(s)
- Yunlong Guo
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun 130117, China; College of Food Science and Engineering, Jilin Agricultural University, Changchun 130117, China
| | - Hongyue Chi
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun 130117, China
| | - Xiaokang Liu
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun 130117, China
| | - Xiuli Sun
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun 130117, China
| | - Yang Wang
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun 130117, China; State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao 999078, China.
| | - Shuying Liu
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun 130117, China
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Willis MD, Rovelli G, Wilson KR. Combining Mass Spectrometry of Picoliter Samples with a Multicompartment Electrodynamic Trap for Probing the Chemistry of Droplet Arrays. Anal Chem 2020; 92:11943-11952. [PMID: 32786501 DOI: 10.1021/acs.analchem.0c02343] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Single droplet levitation provides contactless access to the microphysical and chemical properties of micrometer-sized samples. Most applications of droplet levitation to chemical and biological systems use nondestructive optical techniques to probe droplet properties. To provide improved chemical specificity, we coupled a multicompartment quadrupole electrodynamic trap (QET) with single droplet mass spectrometry. Our QET continuously traps a monodisperse droplet population (tens to hundreds of droplets) and allows for the simultaneous sizing of a single droplet using its Mie scattering pattern. Single droplets are subsequently ejected into the ionization region of an ambient pressure inlet mass spectrometer. We optimized two complementary soft ionization techniques for picoliter aqueous droplets: (1) paper spray (PS) ionization and (2) thermal desorption glow discharge (TDGD) ionization. Both techniques detect oxygenated organic acids in single droplets, with signal-to-noise ratios >100 and detection limits on the order of 10 pg. Sensitivity and reproducibility across single droplets are driven by the droplet deposition location and spray stability in PS-MS and the ionization region humidity and analyte evaporation rate in TDGD-MS. Importantly, the analyte evaporation rate can control the TDGD-MS quantitative capability because high evaporation rates result in significant ion suppression. This effect is mitigated by optimizing the vaporization temperature, droplet size range, and analyte volatility. We demonstrate quantitative and reproducible measurements with a droplet internal standard (<10% RSD) and compare the sensitivity of PS-MS and TDGD-MS. Finally, we demonstrate the application of QET-MS to the study of heterogeneous chemical kinetics with the reaction of gas phase O3 and aqueous maleic acid droplets.
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Affiliation(s)
- Megan D Willis
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Grazia Rovelli
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Kevin R Wilson
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
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Borden SA, Palaty J, Termopoli V, Famiglini G, Cappiello A, Gill CG, Palma P. MASS SPECTROMETRY ANALYSIS OF DRUGS OF ABUSE: CHALLENGES AND EMERGING STRATEGIES. MASS SPECTROMETRY REVIEWS 2020; 39:703-744. [PMID: 32048319 DOI: 10.1002/mas.21624] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 01/22/2020] [Indexed: 06/10/2023]
Abstract
Mass spectrometry has been the "gold standard" for drugs of abuse (DoA) analysis for many decades because of the selectivity and sensitivity it affords. Recent progress in all aspects of mass spectrometry has seen significant developments in the field of DoA analysis. Mass spectrometry is particularly well suited to address the rapidly proliferating number of very high potency, novel psychoactive substances that are causing an alarming number of fatalities worldwide. This review surveys advancements in the areas of sample preparation, gas and liquid chromatography-mass spectrometry, as well as the rapidly emerging field of ambient ionization mass spectrometry. We have predominantly targeted literature progress over the past ten years and present our outlook for the future. © 2020 Periodicals, Inc. Mass Spec Rev.
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Affiliation(s)
- Scott A Borden
- Applied Environmental Research Laboratories (AERL), Department of Chemistry, Vancouver Island University, Nanaimo, BC, V9R 5S5, Canada
- Department of Chemistry, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Jan Palaty
- LifeLabs Medical Laboratories, Burnaby, BC, V3W 1H8, Canada
| | - Veronica Termopoli
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino Carlo Bo, 61029, Urbino, Italy
| | - Giorgio Famiglini
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino Carlo Bo, 61029, Urbino, Italy
| | - Achille Cappiello
- Applied Environmental Research Laboratories (AERL), Department of Chemistry, Vancouver Island University, Nanaimo, BC, V9R 5S5, Canada
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino Carlo Bo, 61029, Urbino, Italy
| | - Chris G Gill
- Applied Environmental Research Laboratories (AERL), Department of Chemistry, Vancouver Island University, Nanaimo, BC, V9R 5S5, Canada
- Department of Chemistry, University of Victoria, Victoria, BC, V8P 5C2, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195
| | - Pierangela Palma
- Applied Environmental Research Laboratories (AERL), Department of Chemistry, Vancouver Island University, Nanaimo, BC, V9R 5S5, Canada
- LC-MS Laboratory, Department of Pure and Applied Sciences, University of Urbino Carlo Bo, 61029, Urbino, Italy
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17
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Song L, Chuah WC, Quick JD, Remsen E, Bartmess JE. Nitrogen direct analysis in real time time-of-flight mass spectrometry (N 2 DART-TOFMS) for rapid screening of forensic drugs. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8558. [PMID: 31429149 DOI: 10.1002/rcm.8558] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 07/22/2019] [Accepted: 08/13/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Over the last ten years, helium direct analysis in real time time-of-flight mass spectrometry (He DART-TOFMS) has become an established technique in rapid screening of forensic drugs to decrease the time necessary to triage forensic drug cases, therefore contributing to backlog reduction and more timely criminal prosecution. Recently, we demonstrated that N2 DART was able to efficiently ionize all polar compounds except for a few extremely small ones such as methanol and acetonitrile. Therefore, N2 DART-TOFMS should be a suitable technique for rapid screening of forensic drugs. METHODS Nitrogen direct analysis in real time time-of-flight mass spectrometry (N2 DART-TOFMS) was performed using a JEOL AccuTOF mass spectrometer with an IonSense DART-100 ion source. A 3-min analytical protocol was used for the analysis of each sample. Sample introduction was accomplished by moving the closed end of a melting point capillary where approximately 1 μL sample solution was deposited or the exposed inside of a freshly cut tablet across the N2 gas stream between the DART-100 ion source and orifice 1 of the AccuTOF. RESULTS Ten commonly abused drugs, eight synthetic cannabinoids and four controlled prescription drugs (CPDs) were analyzed. The limit of detection (LOD) was determined to be approximately 10 μg/mL or 10 pg in quantities. All drugs at the LOD level were positively identified using their [M + H]+ ions with mass errors less than 5 mDa. The identification were further supported by in-source fragment ions and characteristic N2 DART ions that are not commonly generated by He DART, e.g. [M + H + O]+ and [M + H + 2O]+ ions. CONCLUSIONS It was concluded that the 3-min analytical protocol could be utilized in the analysis of seized drugs in the form of tablets and powders or prepared in solution. In consideration that N2 is readily available in the air and He is a non-renewable resource, N2 DART-TOFMS is a greener, cheaper and more convenient alternative to He DART-TOFMS in rapid screening of forensic drugs.
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Affiliation(s)
- Liguo Song
- Department of Chemistry, Western Illinois University, Macomb, IL, 61455, USA
| | - Wei Chean Chuah
- Department of Chemistry, Western Illinois University, Macomb, IL, 61455, USA
| | - Jeffery D Quick
- Department of Chemistry, Western Illinois University, Macomb, IL, 61455, USA
| | - Edward Remsen
- Mund-Lagowski Department of Chemistry & Biochemistry, Bradley University, Peoria, IL, 61625, USA
| | - John E Bartmess
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA
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18
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An S, Liu S, Cao J, Lu S. Nitrogen-Activated Oxidation in Nitrogen Direct Analysis in Real Time Mass Spectrometry (DART-MS) and Rapid Detection of Explosives Using Thermal Desorption DART-MS. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2092-2100. [PMID: 31368004 DOI: 10.1007/s13361-019-02279-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 06/20/2019] [Accepted: 06/25/2019] [Indexed: 06/10/2023]
Abstract
Direct analysis in real time mass spectrometry (DART-MS) was used to analyze an array of explosives including nitro-based explosives, peroxide explosives, and energetic heterocyclic compounds with different DART discharge gases (helium, argon, and nitrogen). Profound analyte oxidation was observed for particular compounds (TNT (9) and 2, 4-DNT (10)), whose mass spectra were completely dominated by the oxidation products when nitrogen was substituted for helium in DART analysis. This interesting phenomenon suggested that a highly oxidative environment provided by N2 DART ion source. A possible mechanism involved in nitrogen DART was proposed which may help further understanding the different chemistry involved in the ionization process. This work also presents a thermal desorption DART (TD-DART) configuration that can enable rapid, specific analysis of explosives from swipes. The screening of swipes with three different compositions (fiberglass, Hybond N+ membrane, and filter paper) showed that fiberglass swipe has the best performance which was then used for the subsequent TD-DART analysis. A direct comparison of TD-DART with traditional DART demonstrated that TD-DART indeed gives better response than traditional DART (provided that the distance between the DART source and mass spectrometer is the same) and will have wider applications than traditional DART.
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Affiliation(s)
- ShuQi An
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry, Beijing Institute of Technology, Beijing, 100081, China
| | - Shuai Liu
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry, Beijing Institute of Technology, Beijing, 100081, China
| | - Jie Cao
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry, Beijing Institute of Technology, Beijing, 100081, China.
| | - ShiFang Lu
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry, Beijing Institute of Technology, Beijing, 100081, China
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19
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Su R, Yu W, Sun K, Yang J, Chen C, Lian W, Liu S, Yang H. The Ion Source of Nitrogen Direct Analysis in Real-Time Mass Spectrometry as a Highly Efficient Reactor: Generation of Reactive Oxygen Species. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:581-587. [PMID: 30784004 DOI: 10.1007/s13361-019-02132-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 12/17/2018] [Accepted: 01/02/2019] [Indexed: 06/09/2023]
Abstract
An innovative strategy for sustainably active oxygen capture using nitrogen (N2) instead of helium (He) as direct analysis in real-time (DART) gas is demonstrated in this work. DART MS was carried out to analyze different polarity compounds including organophosphorus pesticides, amino acids, hormones, and poly brominated diphenyl ethers by using He and N2 as DART gas, respectively. The unexpectedly characteristic ionization reactions, including replacement reaction where the sulfur atom of P=S group, were replaced by oxygen atom, oxidation ([M + nO + H]+ or [M + nO-H]- (n = 1, 2, 3, 4, 5)), and hydrogen loss (loss of two hydrogens) rapidly occurred in situ in the presence of N2 under ambient conditions without any additives. The reaction mechanisms were proposed and further confirmed by high-resolution tandem mass spectrometry. Our study under high temperature and high voltage provides a powerful tool for generating unique ionic species that may be difficult to form by other means, which also creates favorable conditions for the future study of the mechanism of DART MS. Graphical Abstract.
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Affiliation(s)
- Rui Su
- Changchun University of Chinese Medicine, Changchun, 130117, China
| | - Wenjing Yu
- Changchun University of Chinese Medicine, Changchun, 130117, China
| | - Kaiju Sun
- Changchun University of Chinese Medicine, Changchun, 130117, China
| | - Jie Yang
- Pharmaron Beijing Co., Ltd., Beijing, 100176, China
| | - Changbao Chen
- Changchun University of Chinese Medicine, Changchun, 130117, China.
| | - Wenhui Lian
- Changchun University of Chinese Medicine, Changchun, 130117, China
| | - Shuying Liu
- Changchun University of Chinese Medicine, Changchun, 130117, China
| | - Hongmei Yang
- Changchun University of Chinese Medicine, Changchun, 130117, China.
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
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20
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Lara-Ortega FJ, Robles-Molina J, Brandt S, Schütz A, Gilbert-López B, Molina-Díaz A, García-Reyes JF, Franzke J. Use of dielectric barrier discharge ionization to minimize matrix effects and expand coverage in pesticide residue analysis by liquid chromatography-mass spectrometry. Anal Chim Acta 2018; 1020:76-85. [DOI: 10.1016/j.aca.2018.02.077] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 02/20/2018] [Accepted: 02/23/2018] [Indexed: 12/31/2022]
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21
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Gahtory D, Sen R, Pujari S, Li S, Zheng Q, Moses JE, Sharpless KB, Zuilhof H. Quantitative and Orthogonal Formation and Reactivity of SuFEx Platforms. Chemistry 2018; 24:10550-10556. [PMID: 29949211 PMCID: PMC6099289 DOI: 10.1002/chem.201802356] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Indexed: 01/14/2023]
Abstract
The constraints of minute reactant amounts and the impossibility to remove any undesired surface‐bound products during monolayer functionalization of a surface necessitate the selection of efficient, modular and orthogonal reactions that lead to quantitative conversions. Herein, we explore the character of sulfur–fluoride exchange (SuFEx) reactions on a surface, and explore the applicability for quantitative and orthogonal surface functionalization. To this end, we demonstrate the use of ethenesulfonyl fluoride (ESF) as an efficient SuFEx linker for creating “SuFEx‐able” monolayer surfaces, enabling three distinct approaches to utilize SuFEx chemistry on a surface. The first approach relies on a di‐SuFEx loading allowing dual functionalization with a nucleophile, while the two latter approaches focus on dual (CuAAC–SuFEx/SPOCQ–SuFEx) click platforms. The resultant strategies allow facile attachment of two different substrates sequentially on the same platform. Along the way we also demonstrate the Michael addition of ethenesulfonyl fluoride to be a quantitative surface‐bound reaction, indicating significant promise in materials science for this reaction.
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Affiliation(s)
- Digvijay Gahtory
- Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Rickdeb Sen
- Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Sidharam Pujari
- Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Suhua Li
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA.,School of Chemistry, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, P.R. China
| | - Qinheng Zheng
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - John E Moses
- La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Melbourne, Victoria, 3086, Australia
| | - K Barry Sharpless
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Han Zuilhof
- Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands.,School of Pharmaceutical Sciences and Technology, Tianjin University, 92 Weijin Road, Tianjin, P.R. China.,Department of Chemical and Materials Engineering, King Abdulaziz University, Jeddah, Saudi Arabia
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22
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Gaiffe G, Cole RB, Lacpatia S, Bridoux MC. Characterization of Fluorinated Polymers by Atmospheric-Solid-Analysis-Probe High-Resolution Mass Spectrometry (ASAP/HRMS) Combined with Kendrick-Mass-Defect Analysis. Anal Chem 2018; 90:6035-6042. [DOI: 10.1021/acs.analchem.7b05116] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gabriel Gaiffe
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire (IPCM), 4 place Jussieu, 75252 Paris Cedex 05, France
- DAM, DIF, CEA, 91297 Arpajon, France
| | - Richard B. Cole
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire (IPCM), 4 place Jussieu, 75252 Paris Cedex 05, France
| | - Sabrina Lacpatia
- Laboratoire Central de la Préfecture de Police, 39 bis rue de Dantzig, 75015 Paris, France
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23
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Song L, Chuah WC, Lu X, Remsen E, Bartmess JE. Ionization Mechanism of Positive-Ion Nitrogen Direct Analysis in Real Time. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2018; 29:640-650. [PMID: 29392686 DOI: 10.1007/s13361-017-1885-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Revised: 12/21/2017] [Accepted: 12/23/2017] [Indexed: 06/07/2023]
Abstract
Nitrogen can be an inexpensive alternative to helium used by direct analysis in real time (DART), especially in consideration of the looming helium shortage. Therefore, the ionization mechanism of positive-ion N2 DART has been systematically investigated. Our experiments suggest that a range of metastable nitrogen species with a variety of internal energies existed and all of them were less energetic than metastable helium atoms. However, compounds with ionization energies (IE) equal to or lower than 10.2 eV (all organic compounds except the extremely small ones) can be efficiently ionized. Because N2 DART was unable to efficiently ionize ambient moisture and common organic solvents such as methanol and acetonitrile, the most important ionization mechanism was direct Penning ionization followed by self-protonation of polar compounds generating [M+H]+ ions. On the other hand, N2 DART was able to efficiently ionize ammonia, which was beneficial in the ionization of hydrogen-bonding compounds with proton affinities (PA) weaker than ammonia generating [M+NH4]+ ions and large PAHs generating [M+H]+ ions through proton transfer. N2 DART was also able to efficiently ionize NO, which led to the ionization of nonpolar compounds such as alkanes and small aromatics generating [M-(2m+1)H]+ (m=0,1…) ions. Lastly, metastable nitrogen species was also able to produce oxygen atoms, which resulted in increased oxygen adducts as the polarity of organic compounds decreased. In comparison with He DART, N2 DART was approximately one order of magnitude less sensitive in generating [M+H]+ ions, but could be more sensitive in generating [M+NH4]+ ions. Graphical Abstract ᅟ.
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Affiliation(s)
- Liguo Song
- Department of Chemistry, Western Illinois University, Macomb, IL, 61455, USA.
| | - Wei Chean Chuah
- Department of Chemistry, Western Illinois University, Macomb, IL, 61455, USA
| | - Xinyi Lu
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA
| | - Edward Remsen
- Mund-Lagowski Department of Chemistry and Biochemistry, Bradley University, Peoria, IL, 61625, USA
| | - John E Bartmess
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
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24
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Pavlovich MJ, Musselman B, Hall AB. Direct analysis in real time-Mass spectrometry (DART-MS) in forensic and security applications. MASS SPECTROMETRY REVIEWS 2018; 37:171-187. [PMID: 27271453 DOI: 10.1002/mas.21509] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 04/28/2016] [Indexed: 05/10/2023]
Abstract
Over the last decade, direct analysis in real time (DART) has emerged as a viable method for fast, easy, and reliable "ambient ionization" for forensic analysis. The ability of DART to generate ions from chemicals that might be present at the scene of a criminal activity, whether they are in the gas, liquid, or solid phase, with limited sample preparation has made the technology a useful analytical tool in numerous forensic applications. This review paper summarizes many of those applications, ranging from the analysis of trace evidence to security applications, with a focus on providing the forensic scientist with a resource for developing their own applications. The most common uses for DART in forensics are in studying seized drugs, drugs of abuse and their metabolites, bulk and detonated explosives, toxic chemicals, chemical warfare agents, inks and dyes, and commercial plant and animal products that have been adulterated for economic gain. This review is meant to complement recent reviews that have described the fundamentals of the ionization mechanism and the general use of DART. We describe a wide range of forensic applications beyond the field of analyzing drugs of abuse, which dominates the literature, including common experimental and data analysis methods. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 37:171-187, 2018.
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Affiliation(s)
- Matthew J Pavlovich
- Department of Chemistry and Chemical Biology, Barnett Institute for Chemical and Biological Analysis, Northeastern University, Boston 02115, Massachusetts
| | | | - Adam B Hall
- Department of Chemistry and Chemical Biology, Barnett Institute for Chemical and Biological Analysis, Northeastern University, Boston 02115, Massachusetts
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25
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Gyr L, Wolf JC, Franzke J, Zenobi R. Mechanistic Understanding Leads to Increased Ionization Efficiency and Selectivity in Dielectric Barrier Discharge Ionization Mass Spectrometry: A Case Study with Perfluorinated Compounds. Anal Chem 2018; 90:2725-2731. [PMID: 29356499 DOI: 10.1021/acs.analchem.7b04711] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Perfluorinated compounds have unique properties and many practical applications, but are difficult to ionize efficiently with soft ionization methods. An active capillary plasma ionization source based on dielectric barrier discharge ionization (DBDI) coupled with mass spectrometry was used to study the ionization pathway of perfluorinated compounds (PFCs), with the aim of both increasing the ionization efficiency and influencing the selectivity for generating product ions in negative ion mode. Cyclic and linear perfluorinated alkanes were found to mainly form [M - F]- and [M - F + O]- ions, respectively; the [M]-• ion was only obtained at low discharge voltage. Additionally, fluorine attachment [M + F]- was observed mostly for perfluorinated alkenes. An isotope labeling experiment with 18O2 showed that the primary source of oxygen in the substitution reaction is molecular oxygen, reacting with the analyte in the form of O-• ions. The abundance of [M - F + O]- ions can thus be enhanced by increasing the plasma voltage to produce a higher O-• ion density. The loss of the fluorine (without substitution by oxygen) was mainly observed at high frequency, a fact which can be exploited for tuning the ionization toward specific product ions. Overall, the mechanistic understanding of the ionization of PFCs allowed to increase the selectivity of the product ions, resulting in increased ionization efficiency.
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Affiliation(s)
- Luzia Gyr
- Department of Chemistry and Applied Bioscience, ETH Zurich , CH-8093 Zurich, Switzerland
| | - Jan-Christoph Wolf
- Department of Chemistry and Applied Bioscience, ETH Zurich , CH-8093 Zurich, Switzerland
| | - Joachim Franzke
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. , Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
| | - Renato Zenobi
- Department of Chemistry and Applied Bioscience, ETH Zurich , CH-8093 Zurich, Switzerland
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26
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Gaiffe G, Bridoux MC, Costanza C, Cole RB. A systematic tandem mass spectrometric study of anion attachment for improved detection and acidity evaluation of nitrogen-rich energetic compounds. JOURNAL OF MASS SPECTROMETRY : JMS 2018; 53:21-29. [PMID: 28960805 DOI: 10.1002/jms.4034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 09/20/2017] [Accepted: 09/20/2017] [Indexed: 06/07/2023]
Abstract
The development of rapid, efficient, and reliable detection methods for the characterization of energetic compounds is of high importance to security forces concerned with terrorist threats. With a mass spectrometric approach, characteristic ions can be produced by attaching anions to analyte molecules in the negative ion mode of electrospray ionization mass spectrometry (ESI-MS). Under optimized conditions, formed anionic adducts can be detected with higher sensitivities as compared with the deprotonated molecules. Fundamental aspects pertaining to the formation of anionic adducts of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX), 1,3,5-trinitro-1,3,5-triazinane (RDX), pentaerythritol tetranitrate (PETN), nitroglycerin (NG), and 1,3,5-trinitroso-1,3,5-triazinane energetic (R-salt) compounds using various anions have been systematically studied by ESI-MS and ESI tandem mass spectrometry (collision-induced dissociation) experiments. Bracketing method results show that the gas-phase acidities of PETN, RDX, and HMX fall between those of HF and acetic acid. Moreover, PETN and RDX are each less acidic than HMX in the gas phase. Nitroglycerin was found to be the most acidic among the nitrogen-rich explosives studied. The ensemble of bracketing results allows the construction of the following ranking of gas-phase acidities: PETN (1530-1458 kJ/mol) > RDX (approximately 1458 kJ/mol) > HMX (approximately 1433 kJ/mol) > nitroglycerin (1427-1327.8 kJ/mol).
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Affiliation(s)
- Gabriel Gaiffe
- Institut Parisien de Chimie Moléculaire (IPCM), Sorbonne Universités, UPMC Univ Paris 06, 4 Place Jussieu, 75252, Paris Cedex 05, France
| | | | - Christine Costanza
- Laboratoire Central de la Préfecture de Police, 39 bis rue de Dantzig, 75015, Paris, France
| | - Richard B Cole
- Institut Parisien de Chimie Moléculaire (IPCM), Sorbonne Universités, UPMC Univ Paris 06, 4 Place Jussieu, 75252, Paris Cedex 05, France
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27
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Shimada H, Maeno K, Kinoshita K, Shida Y. Rapid Analysis of Ingredients in Cream Using Ultrasonic Mist-Direct Analysis in Real-Time Time-of-Flight Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:2393-2400. [PMID: 28699062 DOI: 10.1007/s13361-017-1746-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Revised: 06/18/2017] [Accepted: 06/18/2017] [Indexed: 06/07/2023]
Abstract
A novel method for the simultaneous detection of ingredients in pharmaceutical applications such as creams and lotions was developed. An ultrasonic atomizer has been used to produce a mist containing ingredients. The analyte molecules in the mist can be ionized by using direct analysis in real time (DART) at lower temperature than traditionally used, and we thus solved the problem of normal DART-MS measurement using a high-temperature gas. Thereby, molecular-related ions of heat-unstable components and nonvolatile components became detectable. The deprotonated molecular ion of glycyrrhizic acid (m/z 821), which is unstable at high temperatures, was detected without pyrolysis by ultrasonic mist-DART-MS using unheated helium gas, although it was not detected by normal DART-MS using heated helium gas. The cationized molecular ions of derivatives of polyethylene glycol fatty acid monoesters, which are nonvolatile compounds, were also detected as m/z peaks observed from 800 to 2300. Although the protonated molecular ion of tocopherol acetate was not detected in ionization by ultrasonic mist, it was detected by ultrasonic mist-DART-MS even in the emulsion. It was not necessary to dissolve a sample completely to detect its ions. This method enabled us to obtain the composition of pharmaceutical applications simply and rapidly. Graphical Abstract ᅟ.
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Affiliation(s)
- Haruo Shimada
- Shiseido Global Innovation Center, 2-2-1 Hayabuchi, Tsuzuki, Yokohama, 224-8558, Japan.
| | - Katsuyuki Maeno
- Shiseido Global Innovation Center, 2-2-1 Hayabuchi, Tsuzuki, Yokohama, 224-8558, Japan
| | | | - Yasuo Shida
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, 400-8511, Japan
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Crawford EA, Gerbig S, Spengler B, Volmer DA. Rapid fingerprinting of lignin by ambient ionization high resolution mass spectrometry and simplified data mining. Anal Chim Acta 2017; 994:38-48. [DOI: 10.1016/j.aca.2017.09.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 08/31/2017] [Accepted: 09/03/2017] [Indexed: 01/31/2023]
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Abstract
Since the introduction of desorption electrospray ionization (DESI) mass spectrometry (MS), ambient MS methods have seen increased use in a variety of fields from health to food science. Increasing its popularity in metabolomics, ambient MS offers limited sample preparation, rapid and direct analysis of liquids, solids, and gases, in situ and in vivo analysis, and imaging. The metabolome consists of a constantly changing collection of small (<1.5 kDa) molecules. These include endogenous molecules that are part of primary metabolism pathways, secondary metabolites with specific functions such as signaling, chemicals incorporated in the diet or resulting from environmental exposures, and metabolites associated with the microbiome. Characterization of the responsive changes of this molecule cohort is the principal goal of any metabolomics study. With adjustments to experimental parameters, metabolites with a range of chemical and physical properties can be selectively desorbed and ionized and subsequently analyzed with increased speed and sensitivity. This review covers the broad applications of a variety of ambient MS techniques in four primary fields in which metabolomics is commonly employed.
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Affiliation(s)
- Chaevien S. Clendinen
- School of Chemistry and Biochemistry & Petit Institute for Bioengineering & Bioscience (IBB), Georgia Institute of Technology, 901 Atlantic Drive NW. Atlanta, GA
| | - María Eugenia Monge
- Centro de Investigaciones en Bionanociencias (CIBION), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2390, C1425FQD, Ciudad de Buenos Aires, Argentina
| | - Facundo M. Fernández
- School of Chemistry and Biochemistry & Petit Institute for Bioengineering & Bioscience (IBB), Georgia Institute of Technology, 901 Atlantic Drive NW. Atlanta, GA
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Zang X, Pérez JJ, Jones CM, Monge ME, McCarty NA, Stecenko AA, Fernández FM. Comparison of Ambient and Atmospheric Pressure Ion Sources for Cystic Fibrosis Exhaled Breath Condensate Ion Mobility-Mass Spectrometry Metabolomics. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:1489-1496. [PMID: 28364225 DOI: 10.1007/s13361-017-1660-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 03/01/2017] [Accepted: 03/12/2017] [Indexed: 06/07/2023]
Abstract
Cystic fibrosis (CF) is an autosomal recessive disorder caused by mutations in the gene that encodes the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The vast majority of the mortality is due to progressive lung disease. Targeted and untargeted CF breath metabolomics investigations via exhaled breath condensate (EBC) analyses have the potential to expose metabolic alterations associated with CF pathology and aid in assessing the effectiveness of CF therapies. Here, transmission-mode direct analysis in real time traveling wave ion mobility spectrometry time-of-flight mass spectrometry (TM-DART-TWIMS-TOF MS) was tested as a high-throughput alternative to conventional direct infusion (DI) electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI) methods, and a critical comparison of the three ionization methods was conducted. EBC was chosen as the noninvasive surrogate for airway sampling over expectorated sputum as EBC can be collected in all CF subjects regardless of age and lung disease severity. When using pooled EBC collected from a healthy control, ESI detected the most metabolites, APCI a log order less, and TM-DART the least. TM-DART-TWIMS-TOF MS was used to profile metabolites in EBC samples from five healthy controls and four CF patients, finding that a panel of three discriminant EBC metabolites, some of which had been previously detected by other methods, differentiated these two classes with excellent cross-validated accuracy. Graphical Abstract ᅟ.
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Affiliation(s)
- Xiaoling Zang
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - José J Pérez
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Christina M Jones
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- National Institute of Standards and Technology, Chemical Science Division, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC, 29412, USA
| | - María Eugenia Monge
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- Centro de Investigaciones en Bionanociencias (CIBION), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2390, C1425FQD, Ciudad de Buenos Aires, Argentina
| | - Nael A McCarty
- Emory+Children's Center for Cystic Fibrosis and Airways Disease Research and Department of Pediatrics, Emory University School of Medicine and Children's Healthcare of Atlanta, Atlanta, GA, 30322, USA
- Institute of Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Arlene A Stecenko
- Emory+Children's Center for Cystic Fibrosis and Airways Disease Research and Department of Pediatrics, Emory University School of Medicine and Children's Healthcare of Atlanta, Atlanta, GA, 30322, USA
| | - Facundo M Fernández
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
- Institute of Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
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Liu ZF, Xu B, Sun ZW, Sun YY, Zhou H, Zhu J, Xu JZ, Duan XK, Liu CC. Identification of Nitro Explosives by Direct Analysis in Real-Time Time-of-Flight Mass Spectrometry. ANAL LETT 2017. [DOI: 10.1080/00032719.2017.1282503] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Zhan-Fang Liu
- Trace Evidence Department, Institute of Forensic Science, Ministry of Public Security, Beijing, China
| | - Bin Xu
- Technical Department, ASPEC Technologies Limited, Beijing, China
| | - Zhen-Wen Sun
- Trace Evidence Department, Institute of Forensic Science, Ministry of Public Security, Beijing, China
| | - Yu-You Sun
- Trace Evidence Department, Institute of Forensic Science, Ministry of Public Security, Beijing, China
| | - Hong Zhou
- Trace Evidence Department, Institute of Forensic Science, Ministry of Public Security, Beijing, China
| | - Jun Zhu
- Trace Evidence Department, Institute of Forensic Science, Ministry of Public Security, Beijing, China
| | - Jian-Zhong Xu
- Trace Evidence Department, Institute of Forensic Science, Ministry of Public Security, Beijing, China
| | - Xiao-Kun Duan
- Technical Department, ASPEC Technologies Limited, Beijing, China
| | - Charles C. Liu
- Technical Department, ASPEC Technologies Limited, Beijing, China
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Rapid identification and desorption mechanisms of nitrogen-based explosives by ambient micro-fabricated glow discharge plasma desorption/ionization (MFGDP) mass spectrometry. Talanta 2017; 167:75-85. [DOI: 10.1016/j.talanta.2017.02.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 02/04/2017] [Indexed: 01/22/2023]
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Guo T, Yong W, Jin Y, Zhang L, Liu J, Wang S, Chen Q, Dong Y, Su H, Tan T. Applications of DART-MS for food quality and safety assurance in food supply chain. MASS SPECTROMETRY REVIEWS 2017; 36:161-187. [PMID: 25975720 DOI: 10.1002/mas.21466] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 01/20/2015] [Accepted: 01/20/2015] [Indexed: 05/21/2023]
Abstract
Direct analysis in real time (DART) represents a new generation of ion source which is used for rapid ionization of small molecules under ambient conditions. The combination of DART and various mass spectrometers allows analyzing multiple food samples with simple or no sample treatment, or in conjunction with prevailing protocolized sample preparation methods. Abundant applications by DART-MS have been reviewed in this paper. The DART-MS strategy applied to food supply chain (FSC), including production, processing, and storage and transportation, provides a comprehensive solution to various food components, contaminants, authenticity, and traceability. Additionally, typical applications available in food analysis by other ambient ionization mass spectrometers were summarized, and fundamentals mainly including mechanisms, devices, and parameters were discussed as well. © 2015 Wiley Periodicals, Inc. Mass Spec Rev. 36:161-187, 2017.
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Affiliation(s)
- Tianyang Guo
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Wei Yong
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing 100123, P.R. China
| | - Yong Jin
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing 100123, P.R. China
| | - Liya Zhang
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Jiahui Liu
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Sai Wang
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Qilong Chen
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Yiyang Dong
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Haijia Su
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Tianwei Tan
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
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Ambient Desorption/Ionization. Mass Spectrom (Tokyo) 2017. [DOI: 10.1007/978-3-319-54398-7_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Li H, Hitchins VM, Wickramasekara S. Rapid detection of bacterial endotoxins in ophthalmic viscosurgical device materials by direct analysis in real time mass spectrometry. Anal Chim Acta 2016; 943:98-105. [PMID: 27769383 PMCID: PMC5500980 DOI: 10.1016/j.aca.2016.09.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 09/23/2016] [Accepted: 09/24/2016] [Indexed: 01/17/2023]
Abstract
Bacterial endotoxins are lipopolysaccharides bound to the bacterial cell wall and released when bacteria rupture or disintegrate. Possible contamination of endotoxin in ophthalmic devices can cause a painful eye inflammation or result in toxic anterior segment syndrome after cataract surgery. Measurement of bacterial endotoxin in medical device materials is difficult since endotoxin binds with polymer matrix and some of the materials are very viscous and non-water soluble, where traditional enzyme-based Limulus amebocyte lysate (LAL) assay cannot be applied. Here we propose a rapid and high throughput ambient ionization mass spectrometric (MS) method using direct analysis in real time (DART) for the evaluation of endotoxin contamination in medical device materials. Large and structurally complex endotoxin instantaneously breaks down into low-mass characteristic fragment ions using DART and is detected by MS in both positive and negative ion modes. This method enables the identification and separation of endotoxin from medical materials with a detection limit of 0.03 ng mL-1 endotoxins in aqueous solution. Ophthalmic viscosurgical device materials including sodium hyaluronate (NaHA), non-water soluble perfluoro-n-octane (PFO) and silicone oil (SO) were spiked with different known concentrations of endotoxin and analyzed by DART MS, where the presence of endotoxin was successfully detected and featured small mass fragment ions were generated for NaHA, PFO and SO as well. Current findings showed the feasibility of measuring endotoxin contamination in medical device materials using DART-MS, which can lead to a one-step analysis of endotoxins in different matrices, avoiding any potential contamination during sample pre-treatment steps.
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Affiliation(s)
- Hongli Li
- Division of Biology, Chemistry, and Materials Science, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD, 20993, United States; Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Victoria M Hitchins
- Division of Biology, Chemistry, and Materials Science, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD, 20993, United States
| | - Samanthi Wickramasekara
- Division of Biology, Chemistry, and Materials Science, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD, 20993, United States.
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Kosyakov DS, Ul'yanovskii NV, Anikeenko EA, Gorbova NS. Negative ion mode atmospheric pressure ionization methods in lignin mass spectrometry: A comparative study. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:2099-2108. [PMID: 27469607 DOI: 10.1002/rcm.7686] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/10/2016] [Accepted: 07/11/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE Mass spectrometry with atmospheric pressure ionization is the most promising method for studying the structure of natural lignin, which is the second most abundant biopolymer in nature. The goal of this study is to compare the efficiency and characteristics of different types of ionization techniques (ESI, APCI, and APPI) in the negative ion mode by the example of softwood lignin. METHODS As the subjects of the study, we selected a preparation of spruce dioxane lignin and several phenols, simulating the basic structural fragments of the lignin macromolecule. High-resolution mass spectra were recorded using an Orbitrap mass spectrometer. Acetone was used as a solvent for samples and a dopant in photoionization mode. The ionization conditions were optimized to achieve the maximum intensity of the mass spectra. RESULTS The formation of deprotonated lignin molecules is characteristic of all the studied types of ionization; partial fragmentation of the biopolymer occurs in all ionization modes. ESI in the presence of ammonia yields low-intensity signals, leads to a significant decrease in ionization efficiency with increasing molecular weight of lignin oligomers, gives high-intensity impurity peaks in the mass spectra, and demonstrates selectivity for more polar structures. The ionization efficiency increases sharply in the order of ESI < APCI < APPI. The two latter methods are characterized by similar mechanisms of ionization; they ensure detection of approximately 1900 spruce lignin oligomers in the range of molecular weights up to 1.8 kDa. The determination of the elemental composition of oligolignols enabled the four main groups of compounds to be distinguished. CONCLUSIONS Photoionization using acetone as a dopant is distinguished by a significantly higher intensity of signals and the lowest sensitivity to contaminants present in the lignin preparation. This ionization method can be considered as preferred for studying the dioxane lignin preparations of woody plants. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Dmitry S Kosyakov
- Core Facility Center 'Arktika', Northern (Arctic) Federal University, Arkhangelsk, Russia
- Institute of Ecological Problems of the North, Ural Branch of Russian Academy of Sciences, Arkhangelsk, Russia
| | - Nikolay V Ul'yanovskii
- Core Facility Center 'Arktika', Northern (Arctic) Federal University, Arkhangelsk, Russia
- Institute of Ecological Problems of the North, Ural Branch of Russian Academy of Sciences, Arkhangelsk, Russia
| | - Elena A Anikeenko
- Core Facility Center 'Arktika', Northern (Arctic) Federal University, Arkhangelsk, Russia
| | - Natalia S Gorbova
- Institute of Ecological Problems of the North, Ural Branch of Russian Academy of Sciences, Arkhangelsk, Russia
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Bridoux MC, Schwarzenberg A, Schramm S, Cole RB. Combined use of direct analysis in real-time/Orbitrap mass spectrometry and micro-Raman spectroscopy for the comprehensive characterization of real explosive samples. Anal Bioanal Chem 2016; 408:5677-5687. [PMID: 27318472 PMCID: PMC4958401 DOI: 10.1007/s00216-016-9691-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/25/2016] [Accepted: 06/03/2016] [Indexed: 01/06/2023]
Abstract
Direct Analysis in Real Time (DART™) high-resolution Orbitrap™ mass spectrometry (HRMS) in combination with Raman microscopy was used for the detailed molecular level characterization of explosives including not only the charge but also the complex matrix of binders, plasticizers, polymers, and other possible organic additives. A total of 15 defused military weapons including grenades, mines, rockets, submunitions, and mortars were examined. Swabs and wipes were used to collect trace (residual) amounts of explosives and their organic constituents from the defused military weapons and micrometer-size explosive particles were transferred using a vacuum suction-impact collection device (vacuum impactor) from wipe and swap samples to an impaction plate made of carbon. The particles deposited on the carbon plate were then characterized using micro-Raman spectroscopy followed by DART-HRMS providing fingerprint signatures of orthogonal nature. The optical microscope of the micro-Raman spectrometer was first used to localize and characterize the explosive charge on the impaction plate which was then targeted for identification by DART-HRMS analysis in both the negative and positive modes. Raman spectra of the explosives TNT, RDX and PETN were acquired from micrometer size particles and characterized by the presence of their characteristic Raman bands obtained directly at the surface of the impaction plate nondestructively without further sample preparation. Negative mode DART-HRMS confirmed the types of charges contained in the weapons (mainly TNT, RDX, HMX, and PETN; either as individual components or as mixtures). These energetic compounds were mainly detected as deprotonated species [M–H]−, or as adduct [M + 35Cl]−, [M + 37Cl]−, or [M + NO3]− anions. Chloride adducts were promoted in the heated DART reagent gas by adding chloroform vapors to the helium stream using an “in-house” delivery method. When the polarity was switched to positive mode, DART-HRMS revealed a very complex distribution of polymeric binders (mainly polyethylene glycols and polypropylene glycols), plasticizers (e.g., dioctyl sebacate, tributyl phosphate), as well as wax-like compounds whose structural features could not be precisely assigned. In positive mode, compounds were identified either as protonated molecules or ammonium adduct species. These results clearly demonstrate the complementarity of micro-Raman microscopy combined with DART-MS. The former technique provides structural information on the type of explosives present at the surface of the sample, whereas the latter provides not only a confirmation of the nature of the explosive charge but also useful additional information regarding the nature of the complex organic matrix of binders, plasticizers, polymers, oils, and potentially other organic additives and contaminants present in the sample. Combining these two techniques provides a powerful tool for the screening, comprehensive characterization, and differentiation of particulate explosive samples for forensic sciences and homeland security applications. Comprehensive characterization of explosive particles collected from swipe samples by micro-Raman and DART™-HRMS ![]()
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Affiliation(s)
| | | | | | - Richard B Cole
- UPMC, IPCM/CSOB, UMR 8232, 4 Place Jussieu, 75252, Paris cedex 05, France
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Cody RB, Dane AJ. Dopant-assisted direct analysis in real time mass spectrometry with argon gas. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:1181-1189. [PMID: 28328019 DOI: 10.1002/rcm.7552] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 03/02/2016] [Accepted: 03/03/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE Dopants used with Atmospheric Pressure Photoionization (APPI) were examined with the Direct Analysis in Real Time (DART® ) ion source operated with argon gas. Charge-exchange and proton transfer reactions were observed by adding toluene, anisole, chlorobenzene and acetone to the DART gas stream, complementing the information obtained by helium DART. METHODS Mass spectra were acquired with a time-of-flight mass spectrometer equipped with a DART ion source operated with argon gas. A syringe pump was used to introduce dopants directly into the DART gas stream through deactivated fused-silica capillary tubing. Samples including polycyclic aromatic hydrocarbons (PAHs), diesel fuel, trinitrotoluene and cannabinoids were deposited onto the sealed end of melting tube, allowed to dry, and the tube was then suspended in the dopant-enhanced DART gas stream. RESULTS PAHs could be detected as molecular ions at concentrations in the low parts-per-billion range by using a solution of 0.5% anisole in toluene as a dopant. Argon DART analysis of a diesel fuel sample with the same dopant mixture showed a simpler mass spectrum than obtained by using helium DART. The argon DART mass spectrum was dominated by molecular ions for aromatic compounds, whereas the helium DART mass spectrum showed both molecular ions and protonated molecules. In contrast O2- attachment DART showed saturated hydrocarbons and oxygen-containing species. Mass spectra for trinitrotoluene with argon DART in negative-ion mode showed a prominent [M - H]- peak, whereas conventional helium DART showed both M- and [M - H]- . Lastly, in analogy to a report in the literature using APPI, positive ions produced by argon DART ionization for delta-9-tetrahydrocannabinol (THC) and cannabidiol showed distinctive product-ion mass spectra. CONCLUSIONS Dopant-assisted argon DART operates by a mechanism that is analogous to those proposed for dopant-assisted atmospheric-pressure photoionization. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Robert B Cody
- JEOL USA, Inc., 11 Dearborn Rd, Peabody, MA, 01960, USA
| | - A John Dane
- JEOL USA, Inc., 11 Dearborn Rd, Peabody, MA, 01960, USA
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Sen R, Escorihuela J, Smulders MMJ, Zuilhof H. Use of Ambient Ionization High-Resolution Mass Spectrometry for the Kinetic Analysis of Organic Surface Reactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3412-9. [PMID: 27028705 DOI: 10.1021/acs.langmuir.6b00427] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
In contrast to homogeneous systems, studying the kinetics of organic reactions on solid surfaces remains a difficult task due to the limited availability of appropriate analysis techniques that are general, high-throughput, and capable of offering quantitative, structural surface information. Here, we demonstrate how direct analysis in real time mass spectrometry (DART-MS) complies with above considerations and can be used for determining interfacial kinetic parameters. The presented approach is based on the use of a MS tag that--in principle--allows application to other reactions. To show the potential of DART-MS, we selected the widely applied strain-promoted alkyne-azide cycloaddition (SPAAC) as a model reaction to elucidate the effects of the nanoenvironment on the interfacial reaction rate.
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Affiliation(s)
- Rickdeb Sen
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
| | - Jorge Escorihuela
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
| | - Maarten M J Smulders
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
| | - Han Zuilhof
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
- Department of Chemical and Materials Engineering, King Abdulaziz University , Jeddah, Saudi Arabia
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Kauppila TJ, Flink A, Pukkila J, Ketola RA. Analysis of nitrogen-based explosives with desorption atmospheric pressure photoionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:467-475. [PMID: 26777676 DOI: 10.1002/rcm.7469] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 11/22/2015] [Accepted: 11/24/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE Fast methods that allow the in situ analysis of explosives from a variety of surfaces are needed in crime scene investigations and home-land security. Here, the feasibility of the ambient mass spectrometry technique desorption atmospheric pressure photoionization (DAPPI) in the analysis of the most common nitrogen-based explosives is studied. METHODS DAPPI and desorption electrospray ionization (DESI) were compared in the direct analysis of trinitrotoluene (TNT), trinitrophenol (picric acid), octogen (HMX), cyclonite (RDX), pentaerythritol tetranitrate (PETN), and nitroglycerin (NG). The effect of different additives in DAPPI dopant and in DESI spray solvent on the ionization efficiency was tested, as well as the suitability of DAPPI to detect explosives from a variety of surfaces. RESULTS The analytes showed ions only in negative ion mode. With negative DAPPI, TNT and picric acid formed deprotonated molecules with all dopant systems, while RDX, HMX, PETN and NG were ionized by adduct formation. The formation of adducts was enhanced by addition of chloroform, formic acid, acetic acid or nitric acid to the DAPPI dopant. DAPPI was more sensitive than DESI for TNT, while DESI was more sensitive for HMX and picric acid. CONCLUSIONS DAPPI could become an important method for the direct analysis of nitroaromatics from a variety of surfaces. For compounds that are thermally labile, or that have very low vapor pressure, however, DESI is better suited.
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Affiliation(s)
- T J Kauppila
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Finland
| | - A Flink
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Finland
| | - J Pukkila
- Crime Laboratory, National Bureau of Investigation, Vantaa, Finland
| | - R A Ketola
- Department of Forensic Medicine, Faculty of Medicine, University of Helsinki, Finland
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Chen W, Hou K, Hua L, Li H. Dopant-assisted reactive low temperature plasma probe for sensitive and specific detection of explosives. Analyst 2015; 140:6025-30. [PMID: 26191543 DOI: 10.1039/c5an00816f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A dopant-assisted reactive low temperature plasma (DARLTP) probe was developed for sensitive and specific detection of explosives by a miniature rectilinear ion trap mass spectrometer. The DARLTP probe was fabricated using a T-shaped quartz tube. The dopant gas was introduced into the plasma stream through a side-tube. Using CH2Cl2 doped wet air as the dopant gas, the detection sensitivities were improved about 4-fold (RDX), 4-fold (PETN), and 3-fold (tetryl) compared with those obtained using the conventional LTP. Furthermore, the formation of [M + (35)Cl](-) and [M + (37)Cl](-) for these explosives enhanced the specificity for their identification. Additionally, the quantities of fragment ions of tetryl and adduct ions such as [RDX + NO2](-) and [PETN + NO2](-) were dramatically reduced, which simplified the mass spectra and avoided the overlap of mass peaks for different explosives. The sensitivity improvement may be attributed to the increased intensity of reactant ion [HNO3 + NO3](-), which was enhanced 4-fold after the introduction of dopant gas. The limits of detection (LODs) for RDX, tetryl, and PETN were down to 3, 6, and 10 pg, respectively. Finally, an explosive mixture was successfully analyzed, demonstrating the potential of the DARLTP probe for qualitative and quantitative analysis of complicated explosives.
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Affiliation(s)
- Wendong Chen
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
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Rapid determination of 1-deoxynojirimycin in Morus alba L. leaves by direct analysis in real time (DART) mass spectrometry. J Pharm Biomed Anal 2015; 114:447-54. [DOI: 10.1016/j.jpba.2015.06.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 06/04/2015] [Accepted: 06/06/2015] [Indexed: 12/11/2022]
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Ding X, Duan Y. Plasma-based ambient mass spectrometry techniques: The current status and future prospective. MASS SPECTROMETRY REVIEWS 2015; 34:449-73. [PMID: 24338668 DOI: 10.1002/mas.21415] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 10/08/2013] [Accepted: 10/08/2013] [Indexed: 05/21/2023]
Abstract
Plasma-based ambient mass spectrometry is emerging as a frontier technology for direct analysis of sample that employs low-energy plasma as the ionization reagent. The versatile sources of ambient mass spectrometry (MS) can be classified according to the plasma formation approaches; namely, corona discharge, glow discharge, dielectric barrier discharge, and microwave-induced discharge. These techniques allow pretreatment-free detection of samples, ranging from biological materials (e.g., flies, bacteria, plants, tissues, peptides, metabolites, and lipids) to pharmaceuticals, food-stuffs, polymers, chemical warfare reagents, and daily-use chemicals. In most cases, plasma-based ambient MS performs well as a qualitative tool and as an analyzer for semi-quantitation. Herein, we provide an overview of the key concepts, mechanisms, and applications of plasma-based ambient MS techniques, and discuss the challenges and outlook.
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Affiliation(s)
- Xuelu Ding
- Research Center of Analytical Instrumentation, Analytical Testing Center and College of Chemistry, Sichuan University, Chengdu, China
| | - Yixiang Duan
- Research Center of Analytical Instrumentation, Analytical Testing Center and College of Chemistry, Sichuan University, Chengdu, China
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Dousty F, O'Brien R. The use of isoprene as a novel dopant in negative ion atmospheric pressure photoionization mass spectrometry coupled to high-performance liquid chromatography. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2015; 29:1031-1038. [PMID: 26044270 DOI: 10.1002/rcm.7187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 02/26/2015] [Accepted: 03/01/2015] [Indexed: 06/04/2023]
Abstract
RATIONALE As in the case with positive ion atmospheric pressure photoionization (PI-APPI), the addition of dopants significantly improves the sensitivity of negative ion APPI (NI-APPI). However, the research on dopant-assisted-NI-APPI has been quite limited compared to the studies on dopant-assisted PI-APPI. This work presents the potential of isoprene as a novel dopant for NI-APPI. METHODS Thirteen compounds, possessing suitable gas-phase ion energetic properties in order to make stable negative ions, were selected. Dopants were continuously introduced into a tee junction prior to the ion source through a fused-silica capillary, while analytes were directly injected into the same tee. Then both were mixed with the continuous solvent from high-performance liquid chromatography (HPLC), nebulized, and entered the source. The nebulized stream was analyzed by APPI tandem quadrupole mass spectrometry in the negative ion mode. RESULTS The results obtained using isoprene were compared with those obtained by using toluene as a dopant and dopant-free NI-APPI. Isoprene enhanced the ionization intensities of the studied compounds, which were found to be comparable and, in some cases, more effective than toluene. The mechanisms leading to the observed set of negative analyte ions were also discussed. Because in NI-APPI, thermal electrons, which are produced during the photoionization of a dopant, are considered the main reagent ions, both isoprene and toluene promoted the ionization of analytes through the same mechanisms, as expected. CONCLUSIONS Isoprene was shown to perform well as a novel dopant for NI-APPI. Isoprene has a high photoabsorption cross section in the VUV region; therefore, its photoionization leads to a highly effective production of thermal electrons, which further promotes the ionization of analytes. In addition, isoprene is environmentally benign and less toxic compared to currently used dopants.
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Affiliation(s)
- Faezeh Dousty
- Department of Chemistry, I.K. Barber School of Arts & Sciences, University of British Columbia Okanagan, Kelowna, BC, Canada, V1V 1 V7
| | - Rob O'Brien
- Supra Res & Dev, Kelowna, BC, Canada, V1W 4C2
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Sisco E, Forbes TP. Rapid detection of sugar alcohol precursors and corresponding nitrate ester explosives using direct analysis in real time mass spectrometry. Analyst 2015; 140:2785-96. [PMID: 25717497 DOI: 10.1039/c4an02347a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This work highlights the rapid detection of nitrate ester explosives and their sugar alcohol precursors by direct analysis in real time mass spectrometry (DART-MS) using an off-axis geometry. Demonstration of the effect of various parameters, such as ion polarity and in-source collision induced dissociation (CID) on the detection of these compounds is presented. Sensitivity of sugar alcohols and nitrate ester explosives was found to be greatest in negative ion mode with sensitivities ranging from hundreds of picograms to hundreds of nanograms, depending on the characteristics of the particular molecule. Altering the in-source CID potential allowed for acquisition of characteristic molecular ion spectra as well as fragmentation spectra. Additional studies were completed to identify the role of different experimental parameters on the sensitivity for these compounds. Variables that were examined included the DART gas stream temperature, the presence of a related compound (i.e., the effect of a precursor on the detection of a nitrate ester explosive), incorporation of dopant species and the role of the analysis surface. It was determined that each variable affected the response and detection of both sugar alcohols and the corresponding nitrate ester explosives. From this work, a rapid and sensitive method for the detection of individual sugar alcohols and corresponding nitrate ester explosives, or mixtures of the two, has been developed, providing a useful tool in the real-world identification of homemade explosives.
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Affiliation(s)
- Edward Sisco
- National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, Maryland 20899, USA.
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Zou WS, Lin S, Li JY, Wei HQ, Zhang XQ, Shen DX, Qiao JQ, Lian HZ, Xie DQ, Ge X. Mechanism and application of halogen bond induced fluorescence enhancement and iodine molecule cleavage in solution. NEW J CHEM 2015. [DOI: 10.1039/c4nj01396d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Halogen bonding between iodine and ciprofloxacin (I⋯N XB) induces I–I cleavage with fluorescence enhancement.
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Abstract
Mass spectrometry methods play a major role in many forensic applications. While gas chromatography-mass spectrometry methods are commonly used in crime laboratories and enforcement agencies, a variety of advanced techniques are now available that can improve upon standard methods and address emerging issues in forensic science. New mass spectrometry technologies include more versatile ionization sources, allowing the next generation of instrumentation to be more multipurpose and adaptable to the needs of the discipline. Direct analysis in real-time mass spectrometry is an ambient ionization method that allows direct testing of gas, liquid and solid samples without the need for any preparation or extraction, based on thermal desorption and ionization directly from the sample surface. This Review will provide an in-depth description of direct analysis in real-time time-of-flight mass spectrometry as applied to samples relevant to forensic science, with a focus on analysis and characterization related to forensic drug chemistry.
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Syage J, Jorabchi K. Ambient Analysis by Thermal Desorption Atmospheric-Pressure Photoionization. AMBIENT IONIZATION MASS SPECTROMETRY 2014. [DOI: 10.1039/9781782628026-00120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Among ambient ionization methods, thermal desorption-ionization stands out because of two attributes: (1) simplicity, rendering the technique suitable for in-field applications, and (2) ability to couple with a variety of gas-phase ionization methods, thereby broadening the range of molecules that can be analyzed with this method. In this chapter we will describe the use of atmospheric-pressure photoionization (APPI) for ambient analysis. The focus will be on uses as standalone sources, such as desorption-APPI (DAPPI), and combination with other ambient sources such as direct analysis in real time-APPI (DART-APPI). Generally, the direct photoionization and charge-transfer mechanisms offered by APPI in addition to a proton-transfer mechanism lead to a higher coverage of small molecules and better sensitivities using APPI and the combined sources. APPI has the advantage of ionizing over a wide range of polarities, in particular extending the range to classes of nonpolar compounds (e.g., PAHs, hydrocarbons, steroids, pesticides, etc.).
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Affiliation(s)
- Jack Syage
- Syagen Technology Inc., a subsidiary of Morpho Detection, Inc. Santa Ana, CA USA
| | - Kaveh Jorabchi
- Department of Chemistry, Georgetown University Washington, DC 20057 USA
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Deme P, Upadhyayula VVR. Ultra performance liquid chromatography atmospheric pressure photoionization high resolution mass spectrometric method for determination of multiclass pesticide residues in grape and mango juices. Food Chem 2014; 173:1142-9. [PMID: 25466136 DOI: 10.1016/j.foodchem.2014.11.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 10/29/2014] [Accepted: 11/01/2014] [Indexed: 11/29/2022]
Abstract
A novel analytical method was developed for determination of organochlorine, synthetic pyrethroid, organophosphate and carbamate pesticide residues in fruit juices using ultra performance liquid chromatography-atmospheric pressure photoionization-high resolution mass spectrometry (UPLC-APPI-HRMS). The analytes were extracted from fruit juices by dispersive solid-phase extraction using multi-walled carbon nanotubes (MWCNTs). The analysis was carried out in full scan mode using dual ionization mode of APPI in the mass range of 100-650 units. The limit of detection and limit of quantification values for the pesticides were in the range of 0.025-0.15 ng mL(-1) and 0.1-0.5 ng mL(-1) respectively. The matrix effect of the method was found to be low and extraction recoveries were in the range of 60-110%. Some of the real fruits juice samples showed the presence of some pesticides in the range of 6.5-24.8 ng L(-1).
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Affiliation(s)
- Pragney Deme
- National Centre for Mass Spectrometry, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500007, Telangana, India
| | - Vijayasarathi V R Upadhyayula
- National Centre for Mass Spectrometry, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500007, Telangana, India.
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Nyadong L, Mapolelo MM, Hendrickson CL, Rodgers RP, Marshall AG. Transmission Geometry Laser Desorption Atmospheric Pressure Photochemical Ionization Mass Spectrometry for Analysis of Complex Organic Mixtures. Anal Chem 2014; 86:11151-8. [DOI: 10.1021/ac502138p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leonard Nyadong
- National
High Magnetic Field Laboratory, Florida State University, 1800
East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Mmilili M. Mapolelo
- National
High Magnetic Field Laboratory, Florida State University, 1800
East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Christopher L. Hendrickson
- National
High Magnetic Field Laboratory, Florida State University, 1800
East Paul Dirac Drive, Tallahassee, Florida 32310, United States
- Department
of Chemistry and Biochemistry, Florida State University, 95 Chieftain
Way, Tallahassee, Florida 32303, United States
- Future Fuels
Institute, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Ryan P. Rodgers
- National
High Magnetic Field Laboratory, Florida State University, 1800
East Paul Dirac Drive, Tallahassee, Florida 32310, United States
- Department
of Chemistry and Biochemistry, Florida State University, 95 Chieftain
Way, Tallahassee, Florida 32303, United States
- Future Fuels
Institute, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Alan G. Marshall
- National
High Magnetic Field Laboratory, Florida State University, 1800
East Paul Dirac Drive, Tallahassee, Florida 32310, United States
- Department
of Chemistry and Biochemistry, Florida State University, 95 Chieftain
Way, Tallahassee, Florida 32303, United States
- Future Fuels
Institute, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
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