利用综合二维气相色谱-飞行时间质谱法非靶向筛选指纹残留,用于未来的法医应用。

IF 2.7 2区 化学 Q2 BIOCHEMICAL RESEARCH METHODS
Emma L. Macturk,  and , Katelynn A. Perrault Uptmor*, 
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引用次数: 0

摘要

在法医调查中,指纹通常被用作证据。手印,供者留下的任何痕迹,无论是否完整的指纹,都包括供者分泌的汗液和油脂。手印的化学成分通常采用气相色谱-质谱联用技术(GC-MS)分析。与手印相关的内源性和外源性成分数量的复杂性往往会在所得色谱图中引起具有挑战性的分辨率。在这些情况下,非靶向分析可以提供比文献中存在的传统靶向方法更大的好处。在这个概念验证研究中,我们开发了一种非靶向的分析手印的方法,并利用全面的二维气相色谱法进行了优化(GC×GC-TOFMS)。评估了两种不同的方法提取显微镜载玻片上的手印的重现性和提取分析物的数量,并选择了溶剂提取的棉签收集方法。仪器参数实验优化,以产生一个最终的工作流程。优化的提取方法和仪器方法共鉴定出70种手印分析物。沉积残留物中的外源成分从内源性手印化合物中分离出来,并用于根据供者使用的个人护理产品区分供者。GC×GC-TOFMS分析的额外色谱空间有利于从内源性指纹化合物中分离化妆品化合物,其中一些已被证明在先前的GC-MS研究中被清除。潜在的非靶向筛选外源性化合物的手印在法医设置被证明为痕量证据的分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nontargeted Screening of Fingermark Residue Using Comprehensive Two-Dimensional Gas Chromatography–Time-of-Flight Mass Spectrometry for Future Use in Forensic Applications

Fingerprints are routinely used as evidence in forensic investigations. Fingermarks, any mark left by a donor whether a complete print or not, include sweat and oil excreted by the donor. The chemical components of fingermarks are typically analyzed by gas chromatography–mass spectrometry (GC-MS). Complexity from the number of endogenous and exogenous components associated with fingermarks tends to cause challenging coelutions in resulting chromatograms. In these scenarios, nontargeted analysis can provide substantial benefits over traditional targeted methods that exist in the literature. In this proof-of-concept study, a nontargeted method for analyzing fingermarks was developed and optimized using comprehensive two-dimensional gas chromatography (GC×GC-TOFMS). Two different methods for extracting fingermarks off a microscope slide were evaluated for reproducibility and the quantity of extracted analytes, and a cotton swab collection with solvent extraction was chosen. Instrumental parameters were experimentally optimized to produce a final workflow. The optimized extraction and instrument methods together identified 70 fingermark analytes. Exogenous components within the deposited residue were resolved from endogenous fingermark compounds and used to differentiate donors based on personal care products used by the donor. The extra chromatographic space from GC×GC-TOFMS analysis was beneficial for resolving cosmetic compounds from endogenous fingermark compounds, some of which have been shown to coelute in GC-MS studies previously. The potential for a nontargeted screening of fingermarks for exogenous compounds in a forensic setting is demonstrated as an analysis of trace evidence.

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来源期刊
CiteScore
5.50
自引率
9.40%
发文量
257
审稿时长
1 months
期刊介绍: The Journal of the American Society for Mass Spectrometry presents research papers covering all aspects of mass spectrometry, incorporating coverage of fields of scientific inquiry in which mass spectrometry can play a role. Comprehensive in scope, the journal publishes papers on both fundamentals and applications of mass spectrometry. Fundamental subjects include instrumentation principles, design, and demonstration, structures and chemical properties of gas-phase ions, studies of thermodynamic properties, ion spectroscopy, chemical kinetics, mechanisms of ionization, theories of ion fragmentation, cluster ions, and potential energy surfaces. In addition to full papers, the journal offers Communications, Application Notes, and Accounts and Perspectives
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