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Classification of Gunshot Residue Using Laser Electrospray Mass Spectrometry and Offline Multivariate Statistical Analysis.
Perez, Johnny J; Watson, David A; Levis, Robert J.
Afiliación
  • Perez JJ; Center for Advanced Photonics Research, Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
  • Watson DA; Center for Advanced Photonics Research, Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
  • Levis RJ; Center for Advanced Photonics Research, Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
Anal Chem ; 88(23): 11390-11398, 2016 12 06.
Article en En | MEDLINE | ID: mdl-27783497
Nonresonant laser vaporization combined with high-resolution electrospray time-of-flight mass spectrometry enables analysis of a casing after discharge of a firearm revealing organic signature molecules including methyl centralite (MC), diphenylamine (DPA), N-nitrosodiphenylamine (N-NO-DPA), 4-nitrodiphenylamine (4-NDPA), a DPA adduct, and multiple unidentified features not observed in previous mass spectral measurements. Collision-induced dissociation measurements of unknown GSR signature ions reveals inorganic barium and derivatives BaOH, BaOHCH3, BaCH3COO remaining from the primer. Both hydrophilic and hydrophobic signatures are detected using water-methanol electrospray solution. Offline principal component analysis and discrimination of the laser electrospray mass spectral (LEMS) measurements resulted in perfect classification of the gun shot residue with respect to the manufacturer. Principal component analysis of recycled and reloaded casings resulted in classification of the penultimate manufacturer with an accuracy of 89%.
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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Anal Chem Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Buscar en Google
Añadir a Mi BVS
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PubMed Links

Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Anal Chem Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos