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Setayeshfar I, Najafi M, Asadi S. Improved preconcentration workflow for organic explosive traces in aqueous samples using solvent-assisted dispersive solid-phase extraction. Forensic Sci Int 2024; 359:112025. [PMID: 38640548 DOI: 10.1016/j.forsciint.2024.112025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 04/08/2024] [Accepted: 04/12/2024] [Indexed: 04/21/2024]
Abstract
The present study deals with the development of a solvent-assisted dispersive solid phase extraction method for the extraction of HMX, RDX, and TNT from aqueous samples. Benzophenone and methanol were selected as explosives sorbent and dispersive solvent respectively. Extraction parameters like pH, extraction time, amount of sorbent, volume and type of the disperser solvent and centrifuge time were optimized. Dispersion of 0.5 mL dispersive solution (4% (w/v) benzophenone in methanol) was performed by injection into the 5 mL aqueous sample (pH=7) using a 1.0 mL syringe. After centrifuge, the extracted explosives were analyzed by high performance liquid chromatography with ultraviolet detection (HPLC-Uv). The results indicated that the linear ranges with the correlation coefficients of 0.99 ≤ R2 were 1.6-204.6 μg L-1, 1.4-213.7 μg L-1 and 1.3-225.9 μg L-1 for HMX, RDX and TNT respectively. The limit of detection and limit of quantification obtained for each explosive were: 0.3 μg L-1 and 0.8 μg L-1 for HMX, 0.3 μg L-1 and 0.9 μg L-1 for RDX and 0.2 μg L-1 and 0.7 μg L-1 for TNT. Finally, the practical applicability of the developed method was evaluated for the extraction of some organic explosives in water samples followed their determination by HPLC-Uv.
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Affiliation(s)
- I Setayeshfar
- Department of Chemistry, Faculty of Science, Imam Hossein University, Tehran 16597, Iran
| | - M Najafi
- Department of Chemistry, Faculty of Science, Imam Hossein University, Tehran 16597, Iran.
| | - S Asadi
- Department of Chemistry, Faculty of Science, Imam Hossein University, Tehran 16597, Iran
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2
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Ledergerber TD, Feeney W, Arroyo L, Trejos T. A feasibility study of direct analysis in real time-mass spectrometry for screening organic gunshot residues from various substrates. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:4744-4757. [PMID: 37694390 DOI: 10.1039/d3ay01258a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
This study reports the use of direct analysis in real time-mass spectrometry (DART-MS) for the detection of organic gunshot residues (OGSR) in a variety of matrices of interest for forensics, customs, and homeland security. Detection limits ranged from (0.075 to 12) ng, with intra- and inter-day reproducibility below 0.0012% CV. The collection of mass spectra at multiple in-source collision-induced dissociation (is-CID) voltages produced distinctive mass spectral signatures with varying levels of fragmentation and allowed differentiation of isomers. To test method performance, a collection of 330 authentic specimens from various substrates were analyzed - (1) neat smokeless powders, (2) spent cartridge cases, (3) burnt particles removed from clothing via carbon stubs or (4) with tweezers, and hand samples from (5) non-shooters, and (6) shooters. A subset of hand specimens (n = 80) was further analyzed by liquid chromatography-tandem mass spectrometry (LC-MS/MS) for confirmation and comparison. Seven types of ammunition from five manufacturers and two calibers were monitored for OGSR profiles with similar compositions observed for paired sets (e.g., unburnt smokeless powder and the respective residues on spent cartridges, clothing, and hands). No false positives were observed across all datasets. A 100% true positive rate (TPR) was observed for all substrates except the shooters' hands. Depending on the ammunition type and classification criteria, the shooters' hands exhibited a TPR ranging from 19% to 73%. The results show that DART-MS is feasible and versatile for fast screening of OGSR across various substrates but may benefit from alternative approaches to improve detection at trace levels.
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Affiliation(s)
| | - William Feeney
- National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA
| | - Luis Arroyo
- Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA.
- Department of Forensic and Investigative Science, West Virginia University, Morgantown, WV 26506, USA
| | - Tatiana Trejos
- Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA.
- Department of Forensic and Investigative Science, West Virginia University, Morgantown, WV 26506, USA
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Alizadeh N, Yoosefian J. Chemical reduction as a facile colorimetric approach for selective TNT detection by spectrophotometry and photothermal lens spectroscopy. Talanta 2023; 257:124334. [PMID: 36773511 DOI: 10.1016/j.talanta.2023.124334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 02/04/2023] [Accepted: 02/06/2023] [Indexed: 02/10/2023]
Abstract
In this study, the simple determination of TNT is achieved through the vivid stable red color products generated after chemically reduction by NaBH4 as a common and accessible reducing/colorimetric reagent. Some other nitroaromatics were impressed under reduction reaction and led to the colorful products. The color of these reduced nitroaromatics were unstable and approximately vanished after some few minutes which ameliorated the selectivity in TNT determination. Utilizing the time-dependent selectivity, the method was applied specifically for discriminating of TNT from other nitroaromatic compounds (NACs). UV-vis spectrophotometry and photothermal lens spectrometry were employed as detection techniques. The former was simpler and more available in various laboratories while the latter provides higher sensitivity. It was revealed that the photothermal lens responses were linear from 2.0 to 55.0 nM with a limit of detection (LOD) of about 0.8 nM. The LOD of the photothermal lens measurement were found to be 241 times lower than that of the UV-vis spectrophotometry in TNT quantification. The evolved method was successfully carried out for TNT vapor determination after trapping into the colorimetric reagent. The recoveries and relative standard deviations (RSD, n = 3) calculated for 3 gas samples were ≥91% and ≤7%, respectively.
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Affiliation(s)
- Naader Alizadeh
- Department of Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
| | - Javad Yoosefian
- Department of Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
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Bener M, Burak Şen F, Apak R. Protamine gold nanoclusters - based fluorescence turn-on sensor for rapid determination of Trinitrotoluene (TNT). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 279:121462. [PMID: 35687992 DOI: 10.1016/j.saa.2022.121462] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/29/2022] [Accepted: 06/01/2022] [Indexed: 06/15/2023]
Abstract
Determination of trace residues of 2,4,6-trinitrotoluene (TNT) is an analytical challenge as it is widely used in military, mining industry, civilian and counter-terrorism purposes. In this study, a gold nanocluster - based turn-on fluorescence sensor was developed for TNT determination. A one-pot approach was used to synthesize the fluorescent protamine - stabilized gold nanoclusters (PRT-AuNC). The proposed turn-on fluorometric sensor relies on the aggregation-induced emission enhancement mechanism. As a result of the donor-acceptor interaction between the non-fluorescent Meisenheimer anion formed from TNT and the amino groups of weakly fluorescent protamine, the PRT-AuNCs aggregate and an accompanying enhancement in fluorescence intensity is observed with a large Stokes shift (λex = 300 nm, λem = 600 nm). The fluorescence enhancement increased linearly with TNT with an LOD of 12.44 µg/L. Similar energetic materials, common soil ions and explosive camouflage materials did not affect the proposed fluorometric sensing method. TNT in artificially contaminated soil was determined, and the results were comparable to those obtained by the HPLC-DAD system. The proposed turn-on sensor is an important tool for simple, fast, rapid and sensitive TNT determination, and has a potential to be converted to a kit format.
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Affiliation(s)
- Mustafa Bener
- Istanbul University, Faculty of Science, Department of Chemistry, Fatih 34126, Istanbul, Turkey.
| | - Furkan Burak Şen
- Istanbul University-Cerrahpasa, Faculty of Engineering, Department of Chemistry, Avcilar 34320, Istanbul, Turkey
| | - Reşat Apak
- Istanbul University-Cerrahpasa, Faculty of Engineering, Department of Chemistry, Avcilar 34320, Istanbul, Turkey.
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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: 6] [Impact Index Per Article: 3.0] [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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Bianchi F, Mattarozzi M, Careri M. The role of surface in desorption electrospray ionization-mass spectrometry: advances and future trends. Anal Bioanal Chem 2020; 412:3967-3973. [PMID: 32385578 DOI: 10.1007/s00216-020-02671-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/12/2020] [Accepted: 04/17/2020] [Indexed: 01/16/2023]
Abstract
An outlook on the current status and trends in desorption electrospray ionization-mass spectrometry (DESI-MS), one of the most common spray-based techniques for ambient ionization, is given with a focus on the main advances recently achieved or still in progress regarding studies of surface properties affecting the signal stability and efficiency of the DESI process. Future directions that the field may take in the years to come are discussed, with particular focus on bioanalytical research.
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Affiliation(s)
- Federica Bianchi
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - Monica Mattarozzi
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - Maria Careri
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
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Shafiee M, Larki A, Faal AY. Fabrication of an Optochemical Sensor Based on Triacetylcellulose Polymer for Colorimetric Determination of Trinitrotoluene. PROPELLANTS EXPLOSIVES PYROTECHNICS 2020. [DOI: 10.1002/prep.201900192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mehdi Shafiee
- Department of ChemistryPayame Noor University Ghom Iran
| | - Arash Larki
- Department of Marine Chemistry, Faculty of Marine ScienceKhorramshahr University of Marine Science and Technology Khorramshahr Iran
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8
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Fatigante WL, Mukta S, Lawton ZE, Bruno AM, Traub A, Gasa AJ, Stelmack AR, Wilson-Frank CR, Mulligan CC. Filter Cone Spray Ionization Coupled to a Portable MS System: Application to On-Site Forensic Evidence and Environmental Sample Analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:336-346. [PMID: 32031391 DOI: 10.1021/jasms.9b00098] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The complexity of field-borne sample matrices and the instrumental constraints of portable mass spectrometers (MS) often necessitate that preparative steps are added prior to ambient MS methods when operated on-site, but the corresponding decrease in throughput and experimental simplicity can make field operation impractical. To this end, we report a modified ambient MS method, filter cone spray ionization (FCSI), specifically designed for simple, yet robust, processing of bulk forensic evidence and environmental samples using a fieldable MS system. This paper-crafted source utilizes low-cost laboratory consumables to produce a conical structure that serves as a disposable, spray-based ionization source. Integrated extraction and filtration capabilities mitigate sample heterogeneity and carryover concerns and expedite sample processing, as characterized through the analysis of a variety of authentic forensic evidence types (e.g., abused pharma tablets, counterfeit/adulterated tablets, crystal-based drugs, synthetic marijuana, toxicological specimens) and contaminated soil samples. The data presented herein suggests that the FCSI-MS design could prove robust to the rigors of field-borne, bulk sample screening, overcoming the inefficiencies of other ambient MS methods for these sample classes. Novel applications of FCSI-MS are also examined, such as the coupling to trace evidence vacuum filtration media.
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Affiliation(s)
- William L Fatigante
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
| | - Shahnaz Mukta
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
| | - Zachary E Lawton
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
| | - Alessandra M Bruno
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
| | - Angelica Traub
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
| | - Alyssa J Gasa
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
| | - Ashley R Stelmack
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
| | - Christina R Wilson-Frank
- Department of Comparative Pathobiology , Purdue University , West Lafayette , Indiana 47907 , United States
- Animal Disease Diagnostic Laboratory , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Christopher C Mulligan
- Department of Chemistry , Illinois State University , Normal , Illinois 61790 , United States
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FORENSIC ASSESSMENT OF GUNSHOT INJURIES USING MODERN OPTICAL RESEARCH METHODS. WORLD OF MEDICINE AND BIOLOGY 2020. [DOI: 10.26724/2079-8334-2020-1-71-159-163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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Bianchi F, Agazzi S, Riboni N, Erdal N, Hakkarainen M, Ilag LL, Anzillotti L, Andreoli R, Marezza F, Moroni F, Cecchi R, Careri M. Novel sample-substrates for the determination of new psychoactive substances in oral fluid by desorption electrospray ionization-high resolution mass spectrometry. Talanta 2019; 202:136-144. [DOI: 10.1016/j.talanta.2019.04.057] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 04/18/2019] [Accepted: 04/22/2019] [Indexed: 11/28/2022]
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12
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Orr A, Stotesbury T, Wilson P, Stock NL. The use of high-resolution mass spectrometry (HRMS) for the analysis of DNA and other macromolecules: A how-to guide for forensic chemistry. Forensic Chem 2019. [DOI: 10.1016/j.forc.2019.100169] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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13
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Ferrofluid of magnetic clay and menthol based deep eutectic solvent: Application in directly suspended droplet microextraction for enrichment of some emerging contaminant explosives in water and soil samples. J Chromatogr A 2018; 1553:32-42. [DOI: 10.1016/j.chroma.2018.04.023] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 04/08/2018] [Accepted: 04/10/2018] [Indexed: 12/30/2022]
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Abstract
Ambient mass spectrometry has evolved rapidly over the past decade, yielding a plethora of platforms and demonstrating scientific advancements across a range of fields from biological imaging to rapid quality control. These techniques have enabled real-time detection of target analytes in an open environment with no sample preparation and can be coupled to any mass analyzer with an atmospheric pressure interface; capabilities of clear interest to the defense, customs and border control, transportation security, and forensic science communities. This review aims to showcase and critically discuss advances in ambient mass spectrometry for the trace detection of explosives.
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Affiliation(s)
- Thomas P Forbes
- National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, MD, USA.
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Bianchi F, Riboni N, Termopoli V, Mendez L, Medina I, Ilag L, Cappiello A, Careri M. MS-Based Analytical Techniques: Advances in Spray-Based Methods and EI-LC-MS Applications. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2018; 2018:1308167. [PMID: 29850370 PMCID: PMC5937452 DOI: 10.1155/2018/1308167] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 02/26/2018] [Indexed: 05/15/2023]
Abstract
Mass spectrometry is the most powerful technique for the detection and identification of organic compounds. It can provide molecular weight information and a wealth of structural details that give a unique fingerprint for each analyte. Due to these characteristics, mass spectrometry-based analytical methods are showing an increasing interest in the scientific community, especially in food safety, environmental, and forensic investigation areas where the simultaneous detection of targeted and nontargeted compounds represents a key factor. In addition, safety risks can be identified at the early stage through online and real-time analytical methodologies. In this context, several efforts have been made to achieve analytical instrumentation able to perform real-time analysis in the native environment of samples and to generate highly informative spectra. This review article provides a survey of some instrumental innovations and their applications with particular attention to spray-based MS methods and food analysis issues. The survey will attempt to cover the state of the art from 2012 up to 2017.
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Affiliation(s)
- Federica Bianchi
- Department of Chemistry, Life Sciences, and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Nicolò Riboni
- Department of Chemistry, Life Sciences, and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
- Department of Environmental Science and Analytical Chemistry, Stockholm University, 10691 Stockholm, Sweden
| | - Veronica Termopoli
- Department of Pure and Applied Sciences, LC-MS Laboratory, Piazza Rinascimento 6, 61029 Urbino, Italy
| | - Lucia Mendez
- Instituto de Investigaciones Marinas, Spanish National Research Council (IIM-CSIC), Eduardo Cabello 6, 36208 Vigo, Spain
| | - Isabel Medina
- Instituto de Investigaciones Marinas, Spanish National Research Council (IIM-CSIC), Eduardo Cabello 6, 36208 Vigo, Spain
| | - Leopold Ilag
- Department of Environmental Science and Analytical Chemistry, Stockholm University, 10691 Stockholm, Sweden
| | - Achille Cappiello
- Department of Pure and Applied Sciences, LC-MS Laboratory, Piazza Rinascimento 6, 61029 Urbino, Italy
| | - Maria Careri
- Department of Chemistry, Life Sciences, and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
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Płotka-Wasylka J, Szczepańska N, Owczarek K, Namieśnik J. Miniaturized Solid Phase Extraction. COMPREHENSIVE ANALYTICAL CHEMISTRY 2017. [DOI: 10.1016/bs.coac.2017.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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17
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Application of CdSe quantum dots for the direct detection of TNT. Forensic Sci Int 2016; 259:101-5. [DOI: 10.1016/j.forsciint.2015.12.028] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 11/30/2015] [Accepted: 12/17/2015] [Indexed: 11/19/2022]
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Seneviratne CA, Ghorai S, Murray KK. Laser desorption sample transfer for gas chromatography/mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:89-94. [PMID: 26661974 DOI: 10.1002/rcm.7419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 10/06/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE Ambient mass spectrometry can detect small molecules directly, but complex mixtures can be a challenge. We have developed a method that incorporates small molecule separation based on laser desorption with capture on a solid-phase microextraction (SPME) fiber for injection into a gas chromatography/mass spectrometry (GC/MS) system. METHODS Samples on a metal target were desorbed by a 3 µm mid-infrared laser focused to a 250 µm spot and 1.2 mJ pulse energy. The desorbed material was aspirated into a metal tube suspended 1 mm above the laser spot and captured on a SPME fiber. The collected material was injected into a GC/MS instrument for analysis. RESULTS We have developed a versatile approach for ambient laser desorption sampling onto SPME for GC/MS analysis. The performance of the laser desorption SPME capture GC/MS system was demonstrated for small molecule standards, a mixture of nitroaromatic explosives, and collected cigarette smoke. CONCLUSIONS The utility of ambient laser desorption sampling onto SPME for GC/MS was demonstrated. The performance of the method was evaluated by preparing calibration standards of caffeine over a range from 200 to 1000 ng. Laser desorption ambient sampling of complex mixtures was accomplished using SPME GC/MS.
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Affiliation(s)
| | - Suman Ghorai
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Kermit K Murray
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
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An innovative method based on quick, easy, cheap, effective, rugged, and safe extraction coupled to desorption electrospray ionization-high resolution mass spectrometry for screening the presence of paralytic shellfish toxins in clams. Talanta 2016; 147:416-21. [DOI: 10.1016/j.talanta.2015.10.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 10/05/2015] [Accepted: 10/06/2015] [Indexed: 11/17/2022]
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20
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Jjunju FPM, Maher S, Li A, Syed SU, Smith B, Heeren RMA, Taylor S, Cooks RG. Hand-held portable desorption atmospheric pressure chemical ionization ion source for in situ analysis of nitroaromatic explosives. Anal Chem 2015; 87:10047-55. [PMID: 26329926 DOI: 10.1021/acs.analchem.5b02684] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A novel, lightweight (0.6 kg), solvent- and gas-cylinder-free, hand-held ion source based on desorption atmospheric pressure chemical ionization has been developed and deployed for the analysis of nitroaromatic explosives on surfaces in open air, offering portability for in-field analysis. A small, inexpensive, rechargeable lithium polymer battery was used to power the custom-designed circuitry within the device, which generates up to ±5 kV dc voltage to ignite a corona discharge plasma in air for up to 12 h of continuous operation, and allowing positive- and negative-ion mass spectrometry. The generated plasma is pneumatically transported to the surface to be interrogated by ambient air at a rate of 1-3.5 L/min, compressed using a small on-board diaphragm pump. The plasma source allows liquid or solid samples to be examined almost instantaneously without any sample preparation in the open environment. The advantages of low carrier gas and low power consumption (<6 W), as well as zero solvent usage, have aided in developing the field-ready, hand-held device for trigger-based, "near-real-time" sampling/ionization. Individual nitroaromatic explosives (such as 2,4,6-trinitrotoluene) can be easily detected in amounts as low as 5.8 pg with a linear dynamic range of at least 10 (10-100 pg), a relative standard deviation of ca. 7%, and an R(2) value of 0.9986. Direct detection of several nitroaromatic compounds in a complex mixture without prior sample preparation is demonstrated, and their identities are confirmed by tandem mass spectrometry fragmentation patterns.
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Affiliation(s)
- Fred P M Jjunju
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool L69 3GJ, U.K.,Q-Technologies Ltd. , 100 Childwall Road, Liverpool L15 6UX, U.K
| | - Simon Maher
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool L69 3GJ, U.K
| | - Anyin Li
- Chemistry Department, Purdue University , West Lafayette, Indiana 47907, United States
| | - Sarfaraz U Syed
- M4I, the Maastricht Multi Modal Molecular Imaging Institute, University of Maastricht , Universiteitssingel 50, 6229 ER Maastricht, The Netherlands
| | - Barry Smith
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool L69 3GJ, U.K.,Q-Technologies Ltd. , 100 Childwall Road, Liverpool L15 6UX, U.K
| | - Ron M A Heeren
- M4I, the Maastricht Multi Modal Molecular Imaging Institute, University of Maastricht , Universiteitssingel 50, 6229 ER Maastricht, The Netherlands
| | - Stephen Taylor
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool L69 3GJ, U.K.,Q-Technologies Ltd. , 100 Childwall Road, Liverpool L15 6UX, U.K
| | - R Graham Cooks
- Chemistry Department, Purdue University , West Lafayette, Indiana 47907, United States
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Guo Y, Wang X, Miao B, Li Y, Yao W, Xie Y, Li J, Wu D, Pei R. An AuNPs-functionalized AlGaN/GaN high electron mobility transistor sensor for ultrasensitive detection of TNT. RSC Adv 2015. [DOI: 10.1039/c5ra16704c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
In this work, we developed a gold nanoparticle functionalized AlGaN/GaN HEMT sensor for fast and ultrasensitive detection of TNT. This HEMT sensor showed attractive properties for TNT detection in terms of speed, sensitivity and miniaturization.
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Affiliation(s)
- Yahui Guo
- i-Lab
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Suzhou 215125
- China
| | - Xiongtao Wang
- i-Lab
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Suzhou 215125
- China
| | - Bin Miao
- i-Lab
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Suzhou 215125
- China
| | - Ying Li
- Key Laboratory for New Type of Functional Materials in Hebei Province
- School of Material and Engineering
- Hebei University of Technology
- Tianjin 300130
- China
| | - Weirong Yao
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- China
| | - Yunfei Xie
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- China
| | - Jiadong Li
- i-Lab
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Suzhou 215125
- China
| | - Dongmin Wu
- i-Lab
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Suzhou 215125
- China
| | - Renjun Pei
- Division of Nanobiomedicine
- Key Laboratory for Nano-Bio Interface
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Suzhou 215123
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