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Sharma B, Gadi R. Analytical Tools and Methods for Explosive Analysis in Forensics: A Critical Review. Crit Rev Anal Chem 2023:1-27. [PMID: 37934616 DOI: 10.1080/10408347.2023.2274927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
This review summarizes (i) compositions and types of improvised explosive devices; (ii) the process of collection, extraction and analysis of explosive evidence encountered in explosive and related cases; (iii) inter-comparison of analytical techniques; (iv) the challenges and prospects of explosive detection technology. The highlights of this study include extensive information regarding the National & International standards specified by USEPA, ASTM, and so on, for explosives detection. The holistic development of analytical tools for explosive analysis ranging from conventional methods to advanced analytical tools is also covered in this article. The most important aspect of this review is to make forensic scientists familiar with the challenges during explosive analysis and the steps to avoid them. The problems during analysis can be analyte-based, that is, interferences due to matrix or added molding/stabilizing agents, trace amount of parent explosives in post-blast samples and many more. Others are techniques-based challenges viz. specificity, selectivity, and sensitivity of the technique. Thus, it has become a primary concern to adopt rapid, field deployable, and highly sensitive techniques.
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Affiliation(s)
- Bhumika Sharma
- Department of Applied Sciences & Humanities, Indira Gandhi Delhi Technical University for Women, Delhi, India
| | - Ranu Gadi
- Department of Applied Sciences & Humanities, Indira Gandhi Delhi Technical University for Women, Delhi, India
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2
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Biocompatible Films of Collagen-Procyanidin for Wound Healing Applications. Appl Biochem Biotechnol 2022; 194:4002-4017. [PMID: 35579739 DOI: 10.1007/s12010-022-03956-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 05/02/2022] [Indexed: 11/02/2022]
Abstract
The study investigated the effect of polyphenols present in Cassia auriculata (CA) leaves in enhancing the stability of the collagen protein and the wound healing potential of collagen films. The crude ethanol extract of CA was analyzed for the presence of phytochemicals and purified by column chromatography using solvents with increasing polarity. The ethanol eluted active fractions (EEAF) that precipitated gelatin was characterized using HP-TLC, FTIR spectroscopy, ESI-FT-MS/MS, and 1H NMR spectroscopy. The active compound was identified to be procyanidin B belonging to the proanthocyanidins group. The wound healing property of EEAF and collagen type I extracted from Clarias batrachus fish skin and the bovine tendon was assessed by in vitro scratch assay on L929 mice fibroblast cell lines. The EEAF-treated collagen coating enhanced in vitro wound closure in comparison with the uncoated dish. It was observed that EEAF treatment improved the physical strength of collagen films. The in vivo wound healing of the EEAF-treated collagen film was examined in male Wister rats and the wound site tissues were assessed. In vivo wound examination showed enhanced healing with EEAF incorporated collagen films. Comparatively, the EEAF-treated bovine tendon collagen films showed improved physical properties and better wound healing property than fish collagen films.
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Logrado LPL, Silva MN, Laboissiere JCA, Braga JWB. Profile of explosives's use in ATMs/cash safes robberies in Brazil. J Forensic Sci 2022; 67:1441-1449. [PMID: 35514166 DOI: 10.1111/1556-4029.15056] [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: 12/21/2021] [Revised: 04/20/2022] [Accepted: 04/25/2022] [Indexed: 11/28/2022]
Abstract
This retrospective study reports data obtained by the Federal Police's National Institute of Criminalistics (INC-PF) relating to chemical analysis aimed at identifying explosives used in Automated teller machines (ATMs)/cash safes robberies between 2014 and 2020 in Brazil. 93 Real cases were studied and, based on the analysis carried out on the materials related to these cases, focusing on the type of explosive used, the following distribution profile was obtained: I) explosive mixtures based on chlorates and/or perchlorates (53%); explosive emulsion (22%); black gunpowder (13%); negative/inconclusive (11%) and organic - pentaerythritol tetranitrate (PETN) (1%). These results can contribute to investigations related to diversion/loss of explosives for criminal purposes, indicating, for example, through relationships between prevalence in the use of a certain type of explosive with a certain location, its possible origin (mining industry, explosive industries, fireworks factories, among others). The profile observed in the results can guide the selection of explosives to be studied in future research, as the possibilities are vast. Furthermore, despite the expressive number of occurrences in Brazil in the period of interest of this study, only a small fraction of samples was sent to the forensic chemistry laboratory to identify the explosive involved, which suggests that expanding chemical analysis should be encouraged in this field. In combination with an increase in professional training and collaboration trials between the laboratories, these activities can improve the chemical explosive's profile in Brazil, enabling the search for correlations between occurrences and contributing to the growth and development of this area.
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Affiliation(s)
- Lúcio Paulo Lima Logrado
- National Institute of Criminalistics, Brazilian Federal Police, Brasília, Brazil.,Institute of Chemistry, University of Brasília, Brasília, Brazil
| | - Marielly Nascimento Silva
- National Institute of Criminalistics, Brazilian Federal Police, Brasília, Brazil.,Institute of Chemistry, University of Brasília, Brasília, Brazil
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Lefferts MJ, Castell MR. Influence of soil type on chemiresistive detection of buried ANFO. Forensic Chem 2022. [DOI: 10.1016/j.forc.2022.100401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Forbes TP, Lawrence J, Hao C, Gillen G. Open port sampling interface mass spectrometry of wipe-based explosives, oxidizers, and narcotics for trace contraband detection. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:3453-3460. [PMID: 34291248 PMCID: PMC9972214 DOI: 10.1039/d1ay01038g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Rapid screening for chemical traces of explosives and narcotics is widely used to support homeland security and law enforcement. These target compounds span a range of physicochemical properties from organic to inorganic, with preferential ionization pathways in both negative and positive mode operation. Nonvolatile inorganic oxidizers present in homemade fuel-oxidizer mixtures, pyrotechnics, and propellants create a unique challenge to traditional thermal desorption-based technologies. Developments in solid-liquid extraction techniques, specifically, open port sampling interface mass spectrometry (OPSI-MS) provide compelling capabilities to address these hurdles. In this proof of concept study, we investigated the trace detection of wipe-based (i.e., common swipe sampling collection method) explosives, oxidizers, and narcotics using an OPSI source and compact single quadrupole mass analyzer. The liquid dissolution and extraction capabilities of OPSI enabled detection of both traditional military-grade explosives and homemade explosive oxidizers. OPSI-MS sensitivities to a series of seven target compounds from polytetrafluoroethylene (PTFE) coated fiberglass sampling wipes were on the order of several nanograms to sub-nanogram levels. Comparisons with direct solution-based sample analysis enabled quantification of wipe-based sample extraction effects. The system demonstrated quick temporal responses, polarity switching capabilities, and rapid signal decay with minimal carryover, all critical to high throughput screening applications. Coupling traditional swipe sampling with OPSI-MS offers a promising tool for contraband screening applications.
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Affiliation(s)
- Thomas P Forbes
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | - Jeffrey Lawrence
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | | | - Greg Gillen
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
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Lefferts MJ, Humphreys LH, Mai N, Murugappan K, Armitage BI, Pons JF, Castell MR. ANFO vapour detection with conducting polymer percolation network sensors and GC/MS. Analyst 2021; 146:2186-2193. [PMID: 33587728 DOI: 10.1039/d0an02403a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Ammonium nitrate mixed with fuel oil (ANFO) is commonly used in improvised explosive devices (IEDs). The development of ANFO vapour sensors that are small, inexpensive, and easy to use will enable widespread IED detection in the context of security and humanitarian demining. Because of concealment and the low vapour pressures of most explosive materials, achieving sufficiently high sensitivity and low limits of detection are some of the main challenges of explosives vapour detection. Here ANFO chemiresistive vapour sensors based on polypyrrole (PPy) percolation networks are presented and compared to gas chromatography-mass spectroscopy (GC/MS) results for ANFO. Improved sensitivities are achieved by using a polymer percolation network instead of a thin film for the gas sensors. Vapour concentrations are detected of 13-180 ppb of ammonia emitted by a variety of different ammonium nitrate-containing fertilisers and fertiliser-diesel mixtures.
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Affiliation(s)
- Merel J Lefferts
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
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Forbes TP, Krauss ST, Gillen G. Trace Detection and Chemical Analysis of Homemade Fuel-Oxidizer Mixture Explosives: Emerging Challenges and Perspectives. Trends Analyt Chem 2020; 131:10.1016/j.trac.2020.116023. [PMID: 34135538 PMCID: PMC8201619 DOI: 10.1016/j.trac.2020.116023] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The chemical analysis of homemade explosives (HMEs) and improvised explosive devices (IEDs) remains challenging for fieldable analytical instrumentation and sensors. Complex explosive fuel-oxidizer mixtures, black and smokeless powders, flash powders, and pyrotechnics often include an array of potential organic and inorganic components that present unique interference and matrix effect difficulties. The widely varying physicochemical properties of these components as well as external environmental interferents and background challenge many sampling and sensing modalities. This review provides perspective on these emerging challenges, critically discusses developments in sampling, sensors, and instrumentation, and showcases advancements for the trace detection of inorganic-based explosives.
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Affiliation(s)
- Thomas P. Forbes
- National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, MD 20899, USA
| | - Shannon T. Krauss
- National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, MD 20899, USA
| | - Greg Gillen
- National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, MD 20899, USA
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Pintabona L, Astefanei A, Corthals GL, van Asten AC. Utilizing Surface Acoustic Wave Nebulization (SAWN) for the Rapid and Sensitive Ambient Ionization Mass Spectrometric Analysis of Organic Explosives. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2655-2669. [PMID: 31659718 PMCID: PMC6914713 DOI: 10.1007/s13361-019-02335-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/21/2019] [Accepted: 08/22/2019] [Indexed: 06/10/2023]
Abstract
When considering incident investigations and security checks focused on energetic materials, there is an ongoing need for rapid, on-scene chemical identification. Currently applied methods are not capable of meeting all requirements, and hence, portable mass spectrometry is an interesting alternative although many instrumental challenges still exist. To be able to analyze explosives with mass spectrometry outside the traditional laboratory, suitable ambient ionization methods need to be developed. Ideally such methods are also easily implemented in the field requiring limited to no power sources, gas supplies, flow controllers, and heating devices. For this reason, the potential of SAWN (surface acoustic wave nebulization) for the ambient ionization and subsequent mass spectrometric (MS) analysis of organic explosives was investigated in this study. Excellent sensitivity was observed for nitrate-based organic explosives when operating the MS in negative mode. No dominant adduct peaks were observed for the peroxides TATP and HMTD with SAWN-MS in positive mode. The MS spectra indicate extensive fragmentation of the peroxide explosives even under the mild ionization conditions provided by SAWN. The potential of SAWN-MS was demonstrated with the correct identification of nitrate-based organic explosives in pre- and post-explosion case samples in only a fraction of the time and effort required for the regular laboratory analysis. Results show that SAWN-MS can convincingly identify intact organic energetic compounds and mixtures but that sensitivity is not always sufficient to detect traces of explosives in post-explosion residues.
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Affiliation(s)
- Lauren Pintabona
- van 't Hoff Institute for Molecular Sciences, Faculty of Science, University of Amsterdam, PO Box 94157, 1090 GD, Amsterdam, The Netherlands
| | - Alina Astefanei
- van 't Hoff Institute for Molecular Sciences, Faculty of Science, University of Amsterdam, PO Box 94157, 1090 GD, Amsterdam, The Netherlands
| | - Garry L Corthals
- van 't Hoff Institute for Molecular Sciences, Faculty of Science, University of Amsterdam, PO Box 94157, 1090 GD, Amsterdam, The Netherlands.
| | - Arian C van Asten
- van 't Hoff Institute for Molecular Sciences, Faculty of Science, University of Amsterdam, PO Box 94157, 1090 GD, Amsterdam, The Netherlands.
- CLHC, Amsterdam Center for Forensic Science and Medicine, University of Amsterdam, P.O. Box 94157, 1090 GD, Amsterdam, The Netherlands.
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10
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Luminescent sensors for nitroaromatic compound detection: Investigation of mechanism and evaluation of suitability of using in screening test in forensics. Microchem J 2019. [DOI: 10.1016/j.microc.2019.104037] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Lehmann EL, Arruda MAZ. Minimalist strategies applied to analysis of forensic samples using elemental and molecular analytical techniques - A review. Anal Chim Acta 2019; 1063:9-17. [PMID: 30967190 DOI: 10.1016/j.aca.2019.02.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 01/29/2019] [Accepted: 02/02/2019] [Indexed: 10/27/2022]
Abstract
Forensic science is an emerging field driven by a number of factors, and the development of different methods of analyses, instruments, and techniques is of great help to experts in the field. Sampling and sample preparation in forensic cases are of utmost importance, and therefore, the methods for processing (or not) the samples are critical for acquiring accurate results. Some alternatives for attaining the minimalist concept, i.e. little or no sample treatment, are discussed in this review. For elemental analysis, analytical techniques, such as X-ray spectrometry, laser-ablation mass spectrometry, laser-induced breakdown spectrometry, inductively coupled plasma mass spectrometry and optical emission spectrometry, and Mössbauer spectrometry are overviewed. Molecular analysis, such as Raman spectroscopy, and ambient ionization mass spectrometry are discussed. Some representative examples are presented that involve in situ analysis, counterfeit bank notes and documents, post-mortem and bone analyses, and forensic analysis of drugs, glass, fingerprints, biological fluids and explosives.
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Affiliation(s)
- Eraldo Luiz Lehmann
- National Institute of Science and Technology, INCT for Bioanalytics, Institute of Chemistry, University of Campinas, Unicamp, P.O. Box 6154, 13083-970, Campinas, SP, Brazil; Group of Spectrometry, Sample Preparation and Mechanization - GEPAM, Institute of Chemistry, University of Campinas, Unicamp, P.O. Box 6154, 13083-970, Campinas, SP, Brazil
| | - Marco Aurélio Zezzi Arruda
- National Institute of Science and Technology, INCT for Bioanalytics, Institute of Chemistry, University of Campinas, Unicamp, P.O. Box 6154, 13083-970, Campinas, SP, Brazil; Group of Spectrometry, Sample Preparation and Mechanization - GEPAM, Institute of Chemistry, University of Campinas, Unicamp, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
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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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Raman hyperspectral imaging in conjunction with independent component analysis as a forensic tool for explosive analysis: The case of an ATM explosion. Talanta 2017; 174:628-632. [DOI: 10.1016/j.talanta.2017.06.064] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 06/23/2017] [Accepted: 06/24/2017] [Indexed: 11/18/2022]
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14
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de Morais DR, Barbosa IL, Cunha KF, Tripodi GL, Angolini CFF, Franco MF, de Aquino EM, Eberlin MN, Costa JL. EASI-IMS an expedite and secure technique to screen for 25I-NBOH in blotter papers. JOURNAL OF MASS SPECTROMETRY : JMS 2017; 52:701-706. [PMID: 28746793 DOI: 10.1002/jms.3977] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 07/17/2017] [Accepted: 07/21/2017] [Indexed: 06/07/2023]
Abstract
The increasing number of new psychoactive substances (NPS) and their quick worldwide spreading, often only slightly modified in the form of new derivatives and analogues, have brought the need for fast, wide-ranging, and unequivocal identification methods in clinical and forensic investigations. Because it usually provides secure results, gas chromatography coupled to mass spectrometry (GC-MS) has been routinely employed as the standard technique for the detection of NPS in blotter papers. For 25I-NBOH (N-(2-hydroxybenzyl)-2-(4-iodo-2,5-dimethoxyphenyl)ethan-1-aminium), however, GC-MS analysis of an blotter paper extract leads to incorrect results. In this work, we investigated whether easy ambient sonic-spray mass spectrometry imaging (EASI-IMS), and ambient ionization MS method can be applied directly to the surface of the sample requiring therefore no extraction or sample preparations, would serve as an efficient, sensitive, and secure alternative for 25I-NBOH screening.
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Affiliation(s)
- Damila Rodrigues de Morais
- ThoMSon Mass Spectrometry Laboratory, University of Campinas, Institute of Chemistry, Campinas, São Paulo, 13083-970, Brazil
| | - Ingrid Lopes Barbosa
- ThoMSon Mass Spectrometry Laboratory, University of Campinas, Institute of Chemistry, Campinas, São Paulo, 13083-970, Brazil
| | - Kelly Francisco Cunha
- Faculty of Medical Sciences, University of Campinas, Campinas, São Paulo, 13083-859, Brazil
| | - Guilherme Lucas Tripodi
- ThoMSon Mass Spectrometry Laboratory, University of Campinas, Institute of Chemistry, Campinas, São Paulo, 13083-970, Brazil
| | | | - Marcos Fernando Franco
- Technical-Scientific Police Superintendency, SPTC, São Paulo, São Paulo, 05507-060, Brazil
- Institute of Chemistry, University of Campinas, Campinas, São Paulo, 13084-971, Brazil
| | | | - Marcos Nogueira Eberlin
- ThoMSon Mass Spectrometry Laboratory, University of Campinas, Institute of Chemistry, Campinas, São Paulo, 13083-970, Brazil
| | - Jose Luiz Costa
- Faculty of Pharmaceutical Sciences, University of Campinas, Campinas, São Paulo, 13083-859, Brazil
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Identification of ANFO: Use of luminescent taggants in post-blast residues. Forensic Sci Int 2017; 275:8-13. [PMID: 28285091 DOI: 10.1016/j.forsciint.2017.02.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 02/13/2017] [Accepted: 02/23/2017] [Indexed: 11/21/2022]
Abstract
This work describes the incorporation of luminescent taggants in cartridges of ammonium nitrate-fuel oil (ANFO) to allow easy identification and collection of post-blast residues. Metal-Organic Frameworks taggants proved to be appropriate for explosive marking when ANFO proportions were above 3.0wt.%. Lanthanide-based light emission enabled in situ retrieval of explosive residues as well as chemical identification, allowing the creation of a coding system using Energy Dispersive Spectroscopy (EDS). The proposed method will accelerate laboratory analysis and support forensic investigations, connecting evidence to suspects and/or to the explosive origin.
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Elbasuney S, El-Sherif AF. Instant detection and identification of concealed explosive-related compounds: Induced Stokes Raman versus infrared. Forensic Sci Int 2017; 270:83-90. [DOI: 10.1016/j.forsciint.2016.11.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 10/30/2016] [Accepted: 11/23/2016] [Indexed: 10/20/2022]
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Correa DN, Santos JM, Eberlin LS, Eberlin MN, Teunissen SF. Forensic Chemistry and Ambient Mass Spectrometry: A Perfect Couple Destined for a Happy Marriage? Anal Chem 2016; 88:2515-26. [DOI: 10.1021/acs.analchem.5b02397] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Deleon N. Correa
- ThoMSon
Mass Spectrometry Laboratory, University of Campinas—UNICAMP, Campinas, São Paulo 13083-970, Brazil
- Technical-Scientific Police Superintendence—IC-SPTC-SP, São Paulo, São Paulo 05507-06, Brazil
| | - Jandyson M. Santos
- ThoMSon
Mass Spectrometry Laboratory, University of Campinas—UNICAMP, Campinas, São Paulo 13083-970, Brazil
| | - Livia S. Eberlin
- Department
of Chemistry, The University of Texas at Austin, Austin, Texas 78712 United States
| | - Marcos N. Eberlin
- ThoMSon
Mass Spectrometry Laboratory, University of Campinas—UNICAMP, Campinas, São Paulo 13083-970, Brazil
| | - Sebastiaan F. Teunissen
- ThoMSon
Mass Spectrometry Laboratory, University of Campinas—UNICAMP, Campinas, São Paulo 13083-970, Brazil
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Correa DN, Zacca JJ, Rocha WFDC, Borges R, de Souza W, Augusti R, Eberlin MN, Vendramini PH. Anti-theft device staining on banknotes detected by mass spectrometry imaging. Forensic Sci Int 2015; 260:22-26. [PMID: 26784008 DOI: 10.1016/j.forsciint.2015.09.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 09/27/2015] [Accepted: 09/28/2015] [Indexed: 11/29/2022]
Abstract
We describe the identification and limits of detection of ink staining by mass spectrometry imaging (MSI), as used in anti-theft devices (ATDs). Such ink staining is applied to banknotes during automated teller machine (ATM) explosions. Desorption electrospray ionization (DESI) coupled with high-resolution and high-accuracy orbitrap mass spectrometry (MS) and a moving stage device were applied to obtain 2D molecular images of the major dyes used for staining, that is, 1-methylaminoanthraquinone (MAAQ), rhodamine B (RB) and rhodamine 6G (R6G). MAAQ could not be detected because of its inefficient desorption by DESI from the banknote cellulose surface. By contrast, ATD staining on banknotes is perceptible by the human naked eye only at concentrations higher than 0.2 μg cm(-2), whereas both RB and R6G at concentrations 200 times lower (as low as 0.001 μg cm(-2)) could be easily detected and imaged by DESI-MSI, with selective and specific identification of each analyte and their spatial distribution on samples from suspects. This technique is non-destructive, and no sample preparation is required, which ensures sample preservation for further forensic investigations.
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Affiliation(s)
- Deleon Nascimento Correa
- ThomSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas - UNICAMP, 13083-970 Campinas, SP, Brazil; Technical-Scientific Police Superintendency, Criminalistic Institute Dr. Octávio Eduardo de Brito Alvarenga - IC-SPTC-SP, 05507-06 São Paulo, SP, Brazil
| | - Jorge Jardim Zacca
- Brazilian Federal Police, Scientific and Technical Department - PF, 70037-900 Brasília, DF, Brazil
| | | | - Rodrigo Borges
- National Institute of Metrology, Quality and Technology - INMETRO, 25250-020 Rio de Janeiro, RJ, Brazil
| | - Wanderley de Souza
- National Institute of Metrology, Quality and Technology - INMETRO, 25250-020 Rio de Janeiro, RJ, Brazil
| | - Rodinei Augusti
- Department of Chemistry, Federal University of Minas Gerais - UFMG, 31270-901 Belo Horizonte, MG, Brazil
| | - Marcos Nogueira Eberlin
- ThomSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas - UNICAMP, 13083-970 Campinas, SP, Brazil
| | - Pedro Henrique Vendramini
- ThomSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas - UNICAMP, 13083-970 Campinas, SP, Brazil.
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