Detection of Trace Evidence of Lubricants in Condoms by Py/GC-MS Method

CHEN Qi-quan; ZHAO Peng-cheng; SONG Hui; ZHAO Liang

doi:10.12452/j.fxcsxb.24040901

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Detection of Trace Evidence of Lubricants in Condoms by Py/GC-MS Method

Scientific Papers | 更新时间：2024-07-08

- Detection of Trace Evidence of Lubricants in Condoms by Py/GC-MS Method
- Journal of Instrumental Analysis Vol. 43, Issue 7, Pages: 995-1002(2024)
- 作者机构：
  
  中国刑事警察学院公安技术法化学系，辽宁沈阳 110854
- 作者简介：
- 基金信息：
- DOI：10.12452/j.fxcsxb.24040901
  CLC： O657.7;D919.2
- Published：15 July 2024，
  
  Received：09 April 2024，
  
  Revised：10 May 2024，
- 稿件说明：
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陈麒全,赵鹏程,宋辉,赵亮.Py/GC-MS法检测安全套润滑剂遗留微量物证[J].分析测试学报,2024,43(07):995-1002.

CHEN Qi-quan,ZHAO Peng-cheng,SONG Hui,ZHAO Liang.Detection of Trace Evidence of Lubricants in Condoms by Py/GC-MS Method[J].Journal of Instrumental Analysis,2024,43(07):995-1002.
陈麒全,赵鹏程,宋辉,赵亮.Py/GC-MS法检测安全套润滑剂遗留微量物证[J].分析测试学报,2024,43(07):995-1002. DOI： 10.12452/j.fxcsxb.24040901.

CHEN Qi-quan,ZHAO Peng-cheng,SONG Hui,ZHAO Liang.Detection of Trace Evidence of Lubricants in Condoms by Py/GC-MS Method[J].Journal of Instrumental Analysis,2024,43(07):995-1002. DOI： 10.12452/j.fxcsxb.24040901.

摘要

采用裂解气相色谱（Py/GC-MS）建立了安全套润滑剂遗留微量物证的高灵敏检测方法。制作模拟性侵案件样本，用正己烷进行超声提取，过膜处理后在N

流下蒸发提取物至50 µL，将收集的提取物用移液枪转移到热解坩埚，待溶剂完全蒸发后，通过Py/GC-MS进行测定。方法学考察结果表明，该方法的定量下限为5 µg/kg，回收率为91.0%～103%，相对标准偏差（RSD）为7.1%～8.3%。采用所建方法对聚二甲基硅氧烷（PDMS）标准品和网购销量前20名的安全套制作的模拟样本进行分析，考察了生物流体（血液、尿液、唾液等体液）的干扰和在不同介质（内衣、皮肤）的持久性。该方法从所有硅基润滑安全套样本中均检出PDMS，可排除空白样本的干扰。生物流体对PDMS检测不会产生干扰，在内衣、皮肤环境下的最长附着时间分别为72、48 h，确立了性侵案件发生后的检测时间窗口，为安全套润滑剂遗留微量物证的检测提供了一种准确可靠的方法。

Abstract

In this study，a highly sensitive detection method for trace evidence of condom lubricants was established using Py/GC-MS. Simulated sexual assault case samples were prepared，extracted using hexane ultrasonication，processed through membrane filtration，and evaporated under N

flow to 50 µL. The collected extract was transferred to a pyrolysis crucible using a pipette，evaporated solvent completely，and analyzed by Py/GC-MS. Methodological investigations showed that the quantitative limit of this method was 5 µg/kg，with recoveries of 91.0% to 103% and relative standard deviations（RSDs） of 7.1% to 8.3%. The method was used to analyze PDMS standards and simulated samples made from the top 20 best-selling condoms from online sellers，assessing interference from biological fluids（blood，urine，saliva） and the persistence on different media（underwear，skin）. PDMS was detected in all silicone-based lubricated condom samples，excluding interference from blank samples. Biological fluids did not interfere with PDMS detection，and the longest attachment times in underwear and skin environments were 72 hours and 48 hours，respectively，establishing a detection time window after sexual assault incidents. This method provides an accurate and reliable way to detect trace evidence of condom lubricants.

关键词

安全套润滑油聚二甲基硅氧烷Py/GC-MS持久性

Keywords

condomlubricantpolydimethylsiloxane（PDMS）Py/GC-MSpersistence

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