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dc.contributor.authorRyder, Alan G.
dc.date.accessioned2016-11-28T15:43:14Z
dc.date.available2016-11-28T15:43:14Z
dc.date.issued2002-03-01
dc.identifier.citationRyder, A. "Classification of Narcotics in Solid Mixtures Using Principal Component Analysis and Raman Spectroscopy," Journal of Forensic Sciences, Vol. 47, No. 2, 2002, pp. 275-284, https://doi.org/10.1520/JFS15244J. ISSN 0022-1198en_IE
dc.identifier.issn1556-4029
dc.identifier.urihttp://hdl.handle.net/10379/6183
dc.description.abstractEighty-five solid samples consisting of illegal narcotics diluted with several different materials were analyzed by near-infrared (785 nm excitation) Raman spectroscopy. Principal Component Analysis (PCA) was employed to classify the samples according to narcotic type. The best sample discrimination was obtained by using the first derivative of the Raman spectra. Furthermore, restricting the spectral variables for PCA to 2 or 3% of the original spectral data according to the most intense peaks in the Raman spectrum of the pure narcotic resulted in a rapid discrimination method for classifying samples according to narcotic type. This method allows for the easy discrimination between cocaine, heroin, and MDMA mixtures even when the Raman spectra are complex or very similar. This approach of restricting the spectral variables also decreases the computational time by a factor of 30 (compared to the complete spectrum), making the methodology attractive for rapid automatic classification and identification of suspect materials.en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherASTM Internationalen_IE
dc.relation.ispartofJournal Of Forensic Sciencesen
dc.subjectRamanen_IE
dc.subjectPrincipal Component Analysisen_IE
dc.subjectForensic scienceen_IE
dc.subjectSubstance abuse detectionen_IE
dc.subjectClassificationen_IE
dc.subjectSpectroscopyen_IE
dc.subjectChemometricsen_IE
dc.subjectNarcoticsen_IE
dc.subjectDiscriminationen_IE
dc.subjectExplosive materialsen_IE
dc.subjectQuantitative analysisen_IE
dc.subjectIn-situen_IE
dc.subjectNear-iren_IE
dc.subjectIdentificationen_IE
dc.subjectMethamphetamineen_IE
dc.subjectSpectrometeren_IE
dc.subjectEcstasyen_IE
dc.subjectTabletsen_IE
dc.subjectSpectraen_IE
dc.titleClassification of narcotics in solid mixtures using principal component analysis and Raman spectroscopyen_IE
dc.typeArticleen_IE
dc.date.updated2016-11-28T10:18:21Z
dc.identifier.doi10.1520/JFS15244J
dc.local.publishedsourcehttps://doi.org/10.1520/JFS15244Jen_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funder|~|1267869|~|
dc.internal.rssid1347714
dc.local.contactAlan Ryder, School Of Chemistry, Room 213, Arts/Science Building, Nui Galway. 2943 Email: alan.ryder@nuigalway.ie
dc.local.copyrightcheckedNo
dc.local.versionPUBLISHED
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