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A Novel Approach for Forensic Differentiation of Grass Stains Using \ATR FT-IR\ Spectroscopy and Chemometrics
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A Novel Approach for Forensic Differentiation of Grass Stains Using \ATR FT-IR\ Spectroscopy and Chemometrics
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Journal Article
A Novel Approach for Forensic Differentiation of Grass Stains Using \ATR FT-IR\ Spectroscopy and Chemometrics
2020
Overview
Grass evidence often encountered at the crime scene, helps in establishing the primary as well as secondary crime scenes. Due to the limited quantity and intricate nature of samples, there is a need for fast, sensitive and reliable techniques for the effective analysis of this vital evidence. In the current study, an attempt is made to study the feasibility of ATR FT-IR in combination with chemo¬metric tools for chemical characterization and species dif¬ferentiation of grass stains. Ten different grass species belonging to three sub¬families, Panicoideae, Chlorodoidae, and Bambusoideae, were collected and analyzed by using the ATR FT-IR spectroscopy combined with the PLSR chemometric tool. Results showed a clear difference between samples of Panicoideae, Chlorodoidae, and Bambusoideae subfami¬lies, and between species of each subfamily. To analyse the performance of the classification model, a set of 10 unknown/blind samples (unknown to the analyst) were randomly selected from the training dataset and all un¬known/blind samples were accurately assigned in their corresponding group. ATR FT-IR spectroscopy requires minimal sample preparation and can be successfully used as an eco-friend¬ly, non-destructive, and reliable alternative to other exist¬ing methods.
Publisher
جامعة نايف العربية للعلوم الأمنية - الجمعية العربية لعلوم الأدلة الجنائية والطب الشرعي
Subject
