Evaluation of evidence value of car primer using pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) and chemometrics

Abstract

The car paint system consisted of four different layers; namely cathodic electrodeposition (CED), primer, the basecoat, and clear coat. Each of these layers may offer valuable information in an analysis of car paint. However, the recovery of a small amount of car paint from a crime scene may not consist of all four layers. Thus, this study is conducted to evaluate the evidence value of car primer in the presence of basecoat and absence of clear coat. In this study, 80 car paint samples, consisting of eight different red basecoats and ten types of primers were analyzed using Py-GC-MS to evaluate the contribution of the primer layer in the analysis of car paint sample. The chromatographic dataset obtained was subjected to chemometric techniques namely principal component analysis (PCA) and cluster analysis (CA). 22 principal components were rendered from PCA with a total variance of 81.23%. CA’s three clusters are cluster 1 and 3 which was based on the shades of red basecoat while cluster 2 was based on the type of primer. This observation showed that the car primer might have a significant contribution to the analysis of car paint using Py-GC-MS.
 Keywords: Car primer, car paint analysis, Py-GC-MS, chemometric

Cheminformatics Applied to Analytical Pyrolysis of Lignocellulosic Materials

“…A common application of Py-GC/MS material analysis is the classification of samples based on the similarities of the compounds they produce. For example, to evaluate different experimental systems [44,45] or for the optimization of two different methods [46]. It was recently used to characterize and classify lignocellulosic samples applying cheminformatics from a chemotaxonomic approach [21].…”

Interpol review of paint, tape, and glass evidence 2019–2022

“…In a research study by Sabaradin et al, 80 simulated automotive paint samples were analyzed using Py-GC-MS, with an emphasis on evaluating the discrimination of paint transfers of two layers: base coat and primer [ 45 ]. The simulated samples were prepared on aluminum sheets, where ten different primers were applied, followed by eight types of red base coats.…”