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首页> 外文期刊>Journal of mass spectrometry: JMS >Forensic analysis of latent fingermarks by silver-assisted LDI imaging MS on nonconductive surfaces
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Forensic analysis of latent fingermarks by silver-assisted LDI imaging MS on nonconductive surfaces

机译：银辅助LDI成像MS对非导电表面上的潜在潜在的法医分析

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摘要

Silver-assisted laser desorption ionization (AgLDI) imaging mass spectrometry (IMS) has been demonstrated to be a useful technology for fingermark analysis allowing for the detection of several classes of endogenous as well as exogenous compounds. Ideally, in IMS analyses, the fingermarks are deposited under controlled conditions on metallized conductive target slides. However, in forensic investigations, fingermarks are often found on a variety of nonconductive surfaces. A sputtered silver layer renders the target surface conductive, which allows the analyses of insulating surfaces by time-of-flight IMS. Ultimately, the major consideration when developing analytical methods for the analysis of latent fingermarks is their capability to be incorporated within forensic standard operational procedures. To demonstrate the potential of AgLDI IMS for forensic applications, fingermarks deposited on nonconductive surfaces commonly found during an investigation, including paper, cardboard, plastic bags and lifting tape, were first revealed by the Surete du Quebec by using forensic enhancement techniques prior to the IMS analyses. Numerous endogenous compounds including fatty acids, cholesterol, squalene, wax esters, triglycerides and several exogenous substances were detected and imaged. Here, we show that silver sputtering can provide visual enhancements of fingerprint patterns after FET procedures through different scenarios in which AgLDI IMS can contribute to forensic investigations. Copyright (C) 2017 John Wiley & Sons, Ltd.
机译：已经证明了银辅助激光解吸电离（AGLDI）成像质谱（IMS）是FingerMark分析的有用技术，允许检测几类内源性以及外源化合物。理想情况下，在IMS分析中，在金属化导电靶载玻片上的受控条件下沉积指纹术。然而，在法医调查中，Fingermarks通常在各种非导电表面上发现。溅射的银层使目标表面导电呈现，其允许通过飞行时间IMS分析绝缘表面。最终，在开发潜在指晶片分析的分析方法时，主要考虑是它们在法医标准操作程序中的能力。为了证明AGLDI IMS对于法医应用的潜力，首先通过在IMS之前使用法医增强技术，首先首先通过在IMS之前使用法医增强技术来透露沉积在普通发现的非导电表面上的非导电表面上的Fingermarks。分析。检测到包括脂肪酸，胆固醇，角鲨烯，蜡酯，甘油三酯和几种外源物质的许多内源化合物。在这里，我们表明，通过不同场景，在FET程序之后，银溅射可以提供指纹图案的视觉增强，其中AGLDI IMS可以有助于取消致法调查。版权所有（c）2017 John Wiley＆Sons，Ltd。

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