走向多维信息:一种无衍生性的UHPLC-QqQ MS/MS方法,用于指纹的氨基酸成分
Shisi Tian1, Yanyan Wang1,2, Shuo Liu1
1Department of Forensic Science, People's Public Security University of China, Beijing, China.
Journal of forensic sciences
|January 24, 2024
概括
分析指纹的化学成分,特别是氨基酸,可以揭示捐赠者的信息. 这项研究开发了一种敏感的方法来区分性别,使用指纹中的氨基酸配置文件,准确度超过90%.
科学领域:
- 法医科学 法医科学 法医科学
- 分析化学 分析化学
- 生物化学 生物化学
背景情况:
- 指纹化学分析提供了多维信息,包括捐赠者概况和年龄,增强了证据价值,特别是在部分或扭曲的打印.
- 氨基酸是汗液指纹中占主导地位的有机物质,受捐赠因素的影响,可能使个人识别成为可能.
- 在指纹中检测和量化各种超微级氨基酸需要高度敏感的方法.
研究的目的:
- 提出和验证一种高效的超高性能液态染色学-三重四极质谱法 (UHPLC-QqQ MS/MS) 方法,用于从指纹中提取和分析13种氨基酸.
- 评估指纹氨基酸分析的不同基质,确定实验室研究的最佳材料.
- 调查氨基酸样本在富含埃克林的指纹中对捐赠者概况的潜力,特别是性别差异化.
主要方法:
- 开发并验证了一种UHPLC-QqQ MS/MS方法,用于同时检测和量化13种氨基酸,而无需衍生.
- 对比了从10种不同的基板中提取氨基酸的效率和潜在污染,确定塑料板是量化分析的理想选择.
- 从30名捐赠者收集了富含埃克林的指纹,并使用经过验证的UHPLC-QqQMS/MS方法分析了它们的氨基酸含量.
- 开发并应用二进制后勤回归 (BLR) 和其他两种数学模型,以根据氨基酸配置文件区分捐赠者.
主要成果:
- 塑料板被确定为定量氨基酸分析的合适基质,最大限度地减少基质固有的氨基酸的干扰.
- 分析了30名捐赠者的氨基酸概况,揭示了显著的差异.
- 通过二进制物流回归和两个额外的数学模型,基于指纹氨基酸含量,成功区分了男性和女性捐赠者,准确度超过90%.
结论:
- 开发的UHPLC-QqQ MS/MS方法对于分析指纹中的多种氨基酸是高效和敏感的.
- 指纹中的氨基酸显示出作为代谢标记物的潜力,用于提供者概况,特别是用于性别识别.
- 进一步研究从指纹氨基酸含量分析多维信息的研究,可以在法医科学中推进个体识别.
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