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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Detection of microscopic particles present as contaminants in latent fingerprints by means of synchrotron radiation-based Fourier transform infra-red micro-imaging
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Detection of microscopic particles present as contaminants in latent fingerprints by means of synchrotron radiation-based Fourier transform infra-red micro-imaging

机译：通过基于同步加速器辐射的傅立叶变换红外显微成像技术检测潜在指纹中作为污染物存在的微观颗粒

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摘要

Synchrotron radiation-based Fourier transform infra-red (SR-FTIR) micro-imaging has been developed as a rapid, direct and non-destructive technique. This method, taking advantage of the high brightness and small effective source size of synchrotron light, is capable of exploring the molecular chemistry within the microstructures of microscopic particles without their destruction at high spatial resolutions. This is in contrast to traditional "wet" chemical methods, which, during processing for analysis, often caused destruction of the original samples. In the present study, we demonstrate the potential of SR-FTIR micro-imaging as an effective way to accurately identify microscopic particles deposited within latent fingerprints. These particles are present from residual amounts of materials left on a person's fingers after handling such materials. Fingerprints contaminated with various types of powders, creams, medications and high explosive materials (3-nitrooxy-2,2-bis(nitrooxymethyl)propyl nitrate (PETN), 1,3,5-trinitro-1,3,5-triazinane (RDX), 2-methyl-1,3,5-trinitrobenzene (TNT)) deposited on various - daily used - substrates have been analysed herein without any further sample preparation. A non-destructive method for the transfer of contaminated fingerprints from hard-to-reach areas of the substrates to the place of analysis is also presented. This method could have a significant impact on forensic science and could dramatically enhance the amount of information that can be obtained from the study of fingerprints.
机译：基于同步辐射的傅立叶变换红外（SR-FTIR）显微成像技术已被开发为一种快速，直接且无损的技术。该方法利用同步加速器光的高亮度和小有效光源尺寸，能够探索微观粒子微观结构内的分子化学，而不会在高空间分辨率下破坏它们。这与传统的“湿”化学方法相反，传统的“湿”化学方法在处理过程中经常造成原始样品的破坏。在本研究中，我们证明了SR-FTIR微成像技术作为准确识别潜在指纹中沉积的微观颗粒的有效方法的潜力。这些颗粒是由在处理此类材料后留在人的手指上的残留材料量产生的。指纹被各种类型的粉末，面霜，药物和高爆炸性材料（3-硝基氧-2,2-双（硝基氧甲基）丙基硝酸酯（PETN），1,3,5-三硝基-1,3,5-三嗪烷（本文已经分析了沉积在各种日常使用的底物上的RDX），2-甲基-1,3,5-三硝基苯（TNT）），而无需任何进一步的样品制备。还提出了一种非破坏性方法，用于将污染的指纹从基材难以到达的区域转移到分析位置。这种方法可能会对法医学产生重大影响，并且可以大大增强从指纹研究中可以获得的信息量。

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