法医学杂志 ›› 2022, Vol. 38 ›› Issue (6): 726-732.DOI: 10.12116/j.issn.1004-5619.2022.320102

• 论著 • 上一篇    下一篇

污水中甲基苯丙胺干扰物N-甲基-2-苯基丙胺的结构解析

张婷婷1(), 黄钰1, 张学军2, 陈捷1, 花镇东1()   

  1. 1.公安部禁毒情报技术中心 毒品监测管控与禁毒关键技术公安部重点实验室,北京 100193
    2.江西省公安厅禁毒总队,江西 南昌 330038
  • 收稿日期:2022-01-25 发布日期:2022-12-25 出版日期:2022-12-28
  • 通讯作者: 花镇东
  • 作者简介:花镇东,男,博士,副研究员,主要从事毒品分析研究;E-mail:28008085@qq.com
    张婷婷(1981—),女,满族,硕士,副研究员,主要从事毒品分析研究;E-mail:42241536@qq.com
  • 基金资助:
    公安部技术研究计划项目(2019JSYJB06)

Structure Analysis of the Interfering Substance N-methyl-2-phenylpropan-1-amine of Methamphetamine in Wastewater

Ting-ting ZHANG1(), Yu HUANG1, Xue-jun ZHANG2, Jie CHEN1, Zhen-dong HUA1()   

  1. 1.Key Laboratory of Drug Monitoring and Control, Drug Intelligence and Forensic Center, Ministry of Public Security, Beijing 100193, China
    2.Anti-drug Corps of Jiangxi Provincial Public Security Department, Nanchang 330038, China
  • Received:2022-01-25 Online:2022-12-25 Published:2022-12-28
  • Contact: Zhen-dong HUA

摘要:

目的 解析污水样品中影响甲基苯丙胺分析结果的干扰物的化学结构。 方法 综合利用GC-MS、液相色谱-四极杆飞行时间质谱(liquid chromatography-quadrupole time-of-flight mass spectrometry,LC-QTOF-MS)对影响甲基苯丙胺分析结果的干扰物的质谱特征进行分析,推测其可能的结构,再使用液相色谱-三重四极杆质谱(liquid chromatography-triple quadrupole-mass spectrometry,LC-TQ-MS)进行对照品确证。 结果 使用LC-QTOF-MS在电喷雾离子源正离子(positive electrospray ionization,ESI+)模式下分析,干扰物MS1质谱的准分子离子质荷比与甲基苯丙胺完全一致,说明干扰物可能为甲基苯丙胺的同分异构体。不同碰撞能量(15 V、30 V和45 V)下得到的MS2质谱图也与甲基苯丙胺高度相似,推测干扰物中含有甲氨基和苄基。进一步使用GC-MS在电子轰击(electron impact,EI)电离模式下分析,干扰物质谱基峰的质荷比为44。经对照品添加分析,最终确认干扰物为N-甲基-2-苯基丙胺。 结论 N-甲基-2-苯基丙胺的化学结构与甲基苯丙胺相似,在使用LC-TQ-MS对污水中痕量甲基苯丙胺进行检测时易产生干扰,实际分析中可借助色谱的保留时间进行区分。

关键词: 法医学, 毒物分析, 甲基苯丙胺, 污水分析, 质谱, 干扰物, N-甲基-2-苯基丙胺

Abstract:

Objective To analyze the chemical structure of the interfering substance that affects the result of methamphetamine analysis in wastewater. Methods A combination of GC-MS and liquid chromatography-quadrupole time-of-flight mass spectrometry (LC-QTOF-MS) was used to analyze the mass spectrum characteristics of the interfering substance that affects the result of methamphetamine analysis and to infer its possible structure. Liquid chromatography-triple quadrupole-mass spectrometry (LC-TQ-MS) was used to confirm the control material. Results Using LC-QTOF-MS in positive electrospray ionization (ESI+) mode, the mass-to-charge ratio (m/z) of quasi-molecular ion in the MS1 mass spectrometry of interfering substance was identical to that of methamphetamine, indicating that the interfering substance was probably an isomer of methamphetamine. The MS2 mass spectra obtained at three collision energies of 15 V, 30 V and 45 V were highly similar to methamphetamine, suggesting that the interfering substance contained methylamino and benzyl groups. Further analysis using GC-MS in electron impact (EI) ionization mode showed that the base peak in the mass spectrum of the interfering substance was at m/z 44. The interfering substance was confirmed to be N-methyl-2-phenylpropan-1-amine by compared with the standard reference. Conclusion The chemical structure of N-methyl-2-phenylpropan-1-amine is highly similar to methamphetamine, which is easy to cause interference for the detection of trace amounts of methamphetamine in wastewater using LC-TQ-MS. Therefore, in the actual analysis, the chromatographic retention time can be used to distinguish between N-methyl-2-phenylpropan-1-amine and methamphetamine.

Key words: forensic medicine, toxicological analysis, methamphetamine, wastewater analysis, mass spectrometry, interfering substance, N-methyl-2-phenylpropan-1-amine (phenpromethamine)

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