一项新的“量身定制”的协议,用于在未发射弹药上开发潜在的指纹

IF 2.6 3区 医学 Q2 CHEMISTRY, ANALYTICAL
Ravell Bengiat , Adi Dahan , Michal Levin-Elad , Nurit Atar , Yakir Liptz , Daniel Mandler , Joseph Almog
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引用次数: 0

摘要

在枪击犯罪现场发现的未发射弹药上的手印(FM)为将嫌疑人与犯罪联系起来提供了关键证据。然而,标准的金属表面FM增强技术——氰基丙烯酸酯乙酯(ECA)熏烟,对于这类证据通常是无效的,因为它对土壤中残留的水和盐的存在高度敏感,导致整个表面的非选择性聚合。在这项工作中,我们开发了一种适用于标准作战条件的未发射黄铜弹药的新方案,基于“反向发展”原则,通过瞄准表面而不是FM残留物来获得更高的灵敏度。这包括使用氰基丙烯酸辛酯(OCA)气熏的预处理阶段,它为FM脊提供超疏水保护层,然后在钯配合物(Na2PdCl4)和黄铜表面之间进行化学沉积反应。这种长链氰基丙烯酸酯衍生物对指纹中的皮脂腺残留物表现出极好的选择性,因为它的反应性较低,即使在发育前长时间暴露在潮湿的土壤中(6天,80% RH),聚合也不受水的影响。此外,拟议的过程允许使用浓缩的Na2PdCl4溶液,而不必担心在同时浸入大量弹药时过度开发,因此提供了来自20个捐助者的320个FMs总数的92%的成功开发。由于其高灵敏度、鲁棒性和大批量适用性,这种简单易用的协议在潜在指纹实验室和CSI现场单位的操作使用中显示出很高的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A new “tailor-made” protocol for operational latent fingermarks’ development on unfired ammunition

A new “tailor-made” protocol for operational latent fingermarks’ development on unfired ammunition
Fingermarks’ (FM) development on unfired ammunition, found at shooting crime-scenes, provide key evidence in connecting a suspect to the crime. However, the standard FM enhancement technique for metal surfaces, ethyl cyanoacrylate (ECA) fuming, is often ineffective for this type of evidence, due to its high sensitivity to presence of residual water and salts from soil, leading to a non-selective polymerization on the entire surface. In this work, we have developed a new protocol for unfired brass ammunition suitable for standard operational conditions, and based on the “reverse-development” principle, to achieve higher sensitivity by targeting the surface, rather than the FM residues. This involves a pre-treatment stage using octyl cyanoacrylate (OCA) fuming, which provides a superhydrophobic protective layer to the FM ridges, followed by an electroless deposition reaction between a palladium complex (Na2PdCl4) and the brass surface. This long-chain cyanoacrylate derivative demonstrated excellent selectivity towards sebaceous residues in fingerprints, as its less reactive nature results in a polymerization that is unaffected by water, even after long exposure to moist soil (6 days, 80 % RH) prior to development. Moreover, the proposed process allowed the use of a concentrated Na2PdCl4 solution, without the fear of over-development when immersing large quantities of ammunition simultaneously, thus affording a successful development of 92 % of a total of 320 FMs from 20 donors. Due to its high sensitivity, robustness, and suitability for large quantities, this simple-to-use protocol has shown a high potential for the future implementation in operational use by latent fingermarks laboratories and CSI field units.
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来源期刊
Forensic Chemistry
Forensic Chemistry CHEMISTRY, ANALYTICAL-
CiteScore
5.70
自引率
14.80%
发文量
65
审稿时长
46 days
期刊介绍: Forensic Chemistry publishes high quality manuscripts focusing on the theory, research and application of any chemical science to forensic analysis. The scope of the journal includes fundamental advancements that result in a better understanding of the evidentiary significance derived from the physical and chemical analysis of materials. The scope of Forensic Chemistry will also include the application and or development of any molecular and atomic spectrochemical technique, electrochemical techniques, sensors, surface characterization techniques, mass spectrometry, nuclear magnetic resonance, chemometrics and statistics, and separation sciences (e.g. chromatography) that provide insight into the forensic analysis of materials. Evidential topics of interest to the journal include, but are not limited to, fingerprint analysis, drug analysis, ignitable liquid residue analysis, explosives detection and analysis, the characterization and comparison of trace evidence (glass, fibers, paints and polymers, tapes, soils and other materials), ink and paper analysis, gunshot residue analysis, synthetic pathways for drugs, toxicology and the analysis and chemistry associated with the components of fingermarks. The journal is particularly interested in receiving manuscripts that report advances in the forensic interpretation of chemical evidence. Technology Readiness Level: When submitting an article to Forensic Chemistry, all authors will be asked to self-assign a Technology Readiness Level (TRL) to their article. The purpose of the TRL system is to help readers understand the level of maturity of an idea or method, to help track the evolution of readiness of a given technique or method, and to help filter published articles by the expected ease of implementation in an operation setting within a crime lab.
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