Chemometric Approaches in Analysis of Vegetable Oils as a Way to Improve an Efficiency of Forensic Examination V. Rudniev*, E. Simakova-Yefremian, V. Khosha, V. Ostropilets
	* Corresponding authors Hon. Prof. M.S. Bokarius Kharkiv Research Institute of Forensic Examinations, Str. Zolochivska 8a, Kharkiv, 61172, Ukraine *e-mail: vasiliy.rudniev@gmail.com
	Methods Objects Chem. Anal., 2019, 14(4), p.192-199 https://doi.org/10.17721/moca.2019.192-199
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Abstract

The approach to forensic examination performance through accelerated classification and identification research of vegetable oils is demonstrated. It includes derivatization of the original objects, analysis of obtained methyl esters mixture using GC-MS technique and applying of chemometric tools for gathering preliminary data. Subsequent processing of obtained chromatograms using principal component analysis for grouping of objects simplifies further detailed examination. An analysis of hidden correlations between variables and influence of the initial data on the first to third major components formation is provided. Using values of content of only 5 most widespread fat acids leads to satisfied visual pattern for prior recognition of oil samples. Applying of various split ratios is recommended at different stages of gas-chromatographic analysis. Split ratio 1 : 50 is recommended for gathering of data treated by chemometric methods and 1 : 2 is useful for determination of minor components presence as specific features.

Keywords: vegetable oils, GC-MS, fatty acid methyl ethers, chemometrics, principal component analysis (PCA)

Article language: Ukr.