Towards establishing a non-destructive technique for forensic ink analysis involving Raman spectroscopy with chemometric procedures

Muhammad Naeim Mohamad Asri, Norhusnaton Najihah Yahya, N. A. M. Nor, W. N. S. M. Desa, D. Ismail
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引用次数: 1

Abstract

Discrimination of ink is one of most challenging aspects in forensic science. Conversely, discrimination of inks had long been debated in the field, yet direct objective conclusion has been rarely achieved. Such a discrimination is nonetheless essential to provide explanations in term of variation in reproducibility or robustness. In this study, we demonstrated the capability of Raman spectroscopy (RS) coupled with Principal Component Analysis (PCA) for discrimination of gel pen inks. Based on the score plots of PC1 vs PC2, discrimination of 83.8% was achieved and 85.7% when PC1 vs PC2 vs PC3 were considered. As the application of chemometric techniques (PCA) to the forensic samples is a relatively new, but promising concept, further development for tasks relating to ink discrimination is recommended in this study for future work. Indeed, RS coupled with chemometrics would rapidly provide objective conclusion in forensic chemistry.Discrimination of ink is one of most challenging aspects in forensic science. Conversely, discrimination of inks had long been debated in the field, yet direct objective conclusion has been rarely achieved. Such a discrimination is nonetheless essential to provide explanations in term of variation in reproducibility or robustness. In this study, we demonstrated the capability of Raman spectroscopy (RS) coupled with Principal Component Analysis (PCA) for discrimination of gel pen inks. Based on the score plots of PC1 vs PC2, discrimination of 83.8% was achieved and 85.7% when PC1 vs PC2 vs PC3 were considered. As the application of chemometric techniques (PCA) to the forensic samples is a relatively new, but promising concept, further development for tasks relating to ink discrimination is recommended in this study for future work. Indeed, RS coupled with chemometrics would rapidly provide objective conclusion in forensic chemistry.
建立一种非破坏性的法医墨水分析技术,包括拉曼光谱与化学计量程序
墨水的鉴别是法医学中最具挑战性的方面之一。相反,油墨的歧视在该领域一直存在争议,但很少有直接客观的结论。尽管如此,这种区分对于提供可重复性或稳健性变化的解释是必不可少的。在这项研究中,我们证明了拉曼光谱(RS)结合主成分分析(PCA)鉴别凝胶笔墨水的能力。根据PC1与PC2的评分图,区分率为83.8%,考虑PC1与PC2与PC3时,区分率为85.7%。由于化学计量技术(PCA)在法医样品中的应用是一个相对较新的但有前途的概念,因此本研究建议进一步发展与墨水识别相关的任务,以供今后的工作使用。事实上,RS与化学计量学相结合可以在法医化学中迅速提供客观的结论。墨水的鉴别是法医学中最具挑战性的方面之一。相反,油墨的歧视在该领域一直存在争议,但很少有直接客观的结论。尽管如此,这种区分对于提供可重复性或稳健性变化的解释是必不可少的。在这项研究中,我们证明了拉曼光谱(RS)结合主成分分析(PCA)鉴别凝胶笔墨水的能力。根据PC1与PC2的评分图,区分率为83.8%,考虑PC1与PC2与PC3时,区分率为85.7%。由于化学计量技术(PCA)在法医样品中的应用是一个相对较新的但有前途的概念,因此本研究建议进一步发展与墨水识别相关的任务,以供今后的工作使用。事实上,RS与化学计量学相结合可以在法医化学中迅速提供客观的结论。
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