Screening of gunshot residues using desorption electrospray ionisation-mass spectrometry (DESI-MS)

Morelato, M; Beavis, A; Ogle, A; Doble, P; Kirkbride, P; Roux, C

Screening of gunshot residues using desorption electrospray ionisation-mass spectrometry (DESI-MS)

Morelato, M

Beavis, A

Ogle, A Doble, P

Kirkbride, P Roux, C

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Publication Type:: Journal Article
Citation:: Forensic Science International, 2012, 217 (1-3), pp. 101 - 106
Issue Date:: 2012-04-10

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Field	Value	Language
dc.contributor.author	Morelato, M https://orcid.org/0000-0001-7616-0623	en_US
dc.contributor.author	Beavis, A https://orcid.org/0000-0001-6259-7699	en_US
dc.contributor.author	Ogle, A	en_US
dc.contributor.author	Doble, P https://orcid.org/0000-0002-8472-1301	en_US
dc.contributor.author	Kirkbride, P	en_US
dc.contributor.author	Roux, C https://orcid.org/0000-0003-3610-420X	en_US
dc.date.available	2011-10-05	en_US
dc.date.issued	2012-04-10	en_US
dc.identifier.citation	Forensic Science International, 2012, 217 (1-3), pp. 101 - 106	en_US
dc.identifier.issn	0379-0738	en_US
dc.identifier.uri	http://hdl.handle.net/10453/18204
dc.description.abstract	Several studies have indicated that there are potential environmental sources of particles resembling inorganic primer found in gunshot residues (GSR); as a consequence examiners are reluctant to unambiguously assign the origin of inorganic particles. If organic gunshot residues (OGSR) were found in combination with inorganic particles, the possibility of environmental sources could be potentially eliminated, thereby significantly enhancing the strength of the evidence.Methods have been previously described whereby GSR specimens can be analysed for the presence of OGSR or inorganic GRS (IGSR). However, no methods have been reported that allow the analysis of both OGSR and IGSR on the same specimen.Described in this article is a direct method using desorption electrospray ionisation-mass spectrometry (DESI-MS) for the detection of methyl centralite (MC), ethyl centralite (EC) and diphenylamine (DPA) on adhesive tape GSR stubs typically used for scanning electron microscopy-energy-dispersive X-ray (SEM-EDX) analysis. The optimisation of numerous parameters was conducted using an experimental design. The results indicate that direct analysis of these organic components of GSR is possible although some limitations were also identified.This initial investigation has also indicated that subjecting stubs to DESI analysis does not interfere with subsequent SEM-EDX analysis of primer residues; therefore the technique described herein allows a comprehensive examination of GSR that would be highly probative in the event that both OGSR and IGSR are detected in the same specimen. © 2011 Elsevier Ireland Ltd.	en_US
dc.relation.ispartof	Forensic Science International	en_US
dc.relation.isbasedon	10.1016/j.forsciint.2011.10.030	en_US
dc.subject.classification	Legal & Forensic Medicine	en_US
dc.title	Screening of gunshot residues using desorption electrospray ionisation-mass spectrometry (DESI-MS)	en_US
dc.type	Journal Article
utslib.citation.volume	1-3	en_US
utslib.citation.volume	217	en_US
utslib.for	0399 Other Chemical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CFS - Centre for Forensic Science
utslib.copyright.status	open_access
pubs.issue	1-3	en_US
pubs.publication-status	Published	en_US
pubs.volume	217	en_US

Abstract:

Several studies have indicated that there are potential environmental sources of particles resembling inorganic primer found in gunshot residues (GSR); as a consequence examiners are reluctant to unambiguously assign the origin of inorganic particles. If organic gunshot residues (OGSR) were found in combination with inorganic particles, the possibility of environmental sources could be potentially eliminated, thereby significantly enhancing the strength of the evidence.Methods have been previously described whereby GSR specimens can be analysed for the presence of OGSR or inorganic GRS (IGSR). However, no methods have been reported that allow the analysis of both OGSR and IGSR on the same specimen.Described in this article is a direct method using desorption electrospray ionisation-mass spectrometry (DESI-MS) for the detection of methyl centralite (MC), ethyl centralite (EC) and diphenylamine (DPA) on adhesive tape GSR stubs typically used for scanning electron microscopy-energy-dispersive X-ray (SEM-EDX) analysis. The optimisation of numerous parameters was conducted using an experimental design. The results indicate that direct analysis of these organic components of GSR is possible although some limitations were also identified.This initial investigation has also indicated that subjecting stubs to DESI analysis does not interfere with subsequent SEM-EDX analysis of primer residues; therefore the technique described herein allows a comprehensive examination of GSR that would be highly probative in the event that both OGSR and IGSR are detected in the same specimen. © 2011 Elsevier Ireland Ltd.

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http://hdl.handle.net/10453/18204