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Principal Component Analysis and Analysis of Variance on the Effects of Entellan New on the Raman Spectra of Fibers

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Abstract:  During the forensic examination of textile fibers, fibers are usually mounted on glass slides for visual inspection and identification under the microscope. One method that has the capability to accurately identify single textile fibers without subsequent demounting is Raman microspectroscopy. The effect of the mountant Entellan New on the Raman spectra of fibers was investigated to determine if it is suitable for fiber analysis. Raman spectra of synthetic fibers mounted in three different ways were collected and subjected to multivariate analysis. Principal component analysis score plots revealed that while spectra from different fiber classes formed distinct groups, fibers of the same class formed a single group regardless of the mounting method. The spectra of bare fibers and those mounted in Entellan New were found to be statistically indistinguishable by analysis of variance calculations. These results demonstrate that fibers mounted in Entellan New may be identified directly by Raman microspectroscopy without further sample preparation.
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Document Type: Research Article

Affiliations: Trace Evidence Services, National Centre for Forensic Services – Alberta, Royal Canadian Mounted Police, 15707-118 Avenue, Edmonton, AB T5V 1B7, Canada.

Publication date: January 1, 2012

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