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A Novel Two-Step Method for the Detection of Organic Gunshot Residue for Forensic Purposes: Fast Fluorescence Imaging Followed by Raman Microspectroscopic Identification
Analytical Chemistry ( IF 6.7 ) Pub Date : 2019-08-22 00:00:00 , DOI: 10.1021/acs.analchem.9b02306 Shelby R. Khandasammy 1 , Alexander Rzhevskii 2 , Igor K. Lednev 1
Analytical Chemistry ( IF 6.7 ) Pub Date : 2019-08-22 00:00:00 , DOI: 10.1021/acs.analchem.9b02306 Shelby R. Khandasammy 1 , Alexander Rzhevskii 2 , Igor K. Lednev 1
Affiliation
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Gunshot residue (GSR) is potentially key evidence during a criminal investigation of a shooting accident. Current standardized forensic science methods target the detection of inorganic GSR (IGSR). In this proof-of-concept study, a new two-step method for the detection and identification of organic GSR (OGSR) is proposed. This method utilizes highly sensitive fluorescence hyperspectral imaging of a sample area to detect potential GSR particles, followed by confirmatory identification of the detected particles using Raman microspectroscopy. In this study, two different GSR samples on adhesive tape substrates were created. One sample was made by manually placing a known amount of OGSR particles onto an adhesive tape substrate. The second sample mimicked a real crime scene situation and had an unknown number of GSR particles mounted onto an adhesive tape substrate using a most common tape-lifting procedure for the recovery of GSR from the skin of a suspect and other surfaces. These two samples were subjected to the developed two-step analysis method. It was found that this method was accurately able to detect and identify all OGSR particles. Representative spectra of OGSR particles showed characteristic Raman peaks at 850 cm–1, 1287 cm–1, and 2970 cm–1. This methodology offers a promising means to meet current needs within the framework of GSR analysis by providing a way to accurately detect and identify OGSR.
中文翻译：
一种新颖的两步法检测法医枪械残留物的方法：快速荧光成像，随后进行拉曼光谱鉴定
枪击残留物（GSR）可能是对枪击事故进行刑事调查期间的关键证据。当前的标准化法医科学方法的目标是检测无机GSR（IGSR）。在此概念验证研究中，提出了一种用于有机GSR（OGSR）的检测和识别的新的两步法。该方法利用样品区域的高灵敏度荧光高光谱成像来检测潜在的GSR颗粒，然后使用拉曼显微光谱法对检测到的颗粒进行确认性鉴定。在这项研究中，在胶带基材上创建了两个不同的GSR样品。通过将已知量的OGSR颗粒手动放置到胶带基材上来制作一个样品。第二个样本模仿了真实的犯罪现场情况，并使用最常见的胶带提起程序将不明数量的GSR颗粒安装在胶带基材上，以从犯罪嫌疑人的皮肤和其他表面上回收GSR。对这两个样品进行开发的两步分析方法。发现该方法能够准确地检测和识别所有OGSR颗粒。OGSR颗粒的代表性光谱在850 cm处显示特征性的拉曼峰-1，1287厘米-1，和2970厘米-1。通过提供一种准确检测和识别OGSR的方法，该方法为在GSR分析框架内满足当前需求提供了一种有前途的方法。
更新日期：2019-08-22
中文翻译：
一种新颖的两步法检测法医枪械残留物的方法：快速荧光成像，随后进行拉曼光谱鉴定
枪击残留物（GSR）可能是对枪击事故进行刑事调查期间的关键证据。当前的标准化法医科学方法的目标是检测无机GSR（IGSR）。在此概念验证研究中，提出了一种用于有机GSR（OGSR）的检测和识别的新的两步法。该方法利用样品区域的高灵敏度荧光高光谱成像来检测潜在的GSR颗粒，然后使用拉曼显微光谱法对检测到的颗粒进行确认性鉴定。在这项研究中，在胶带基材上创建了两个不同的GSR样品。通过将已知量的OGSR颗粒手动放置到胶带基材上来制作一个样品。第二个样本模仿了真实的犯罪现场情况，并使用最常见的胶带提起程序将不明数量的GSR颗粒安装在胶带基材上，以从犯罪嫌疑人的皮肤和其他表面上回收GSR。对这两个样品进行开发的两步分析方法。发现该方法能够准确地检测和识别所有OGSR颗粒。OGSR颗粒的代表性光谱在850 cm处显示特征性的拉曼峰-1，1287厘米-1，和2970厘米-1。通过提供一种准确检测和识别OGSR的方法，该方法为在GSR分析框架内满足当前需求提供了一种有前途的方法。
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