高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (12): 3632.doi: 10.7503/cjcu20210318

• 分析化学 • 上一篇    下一篇

C1~C3正构醛、 醇在质子转移反应飞行时间质谱中的产物离子特征分析

王如新1, 赵忠俊2, 贺飞耀1, 岳寒露1, 邓辅龙1, 李宏1, 李雯雯3(), 段忆翔1()   

  1. 1.四川大学生命科学学院
    2.化学工程学院
    3.华西公共卫生学院, 华西第四医院, 成都 610064
  • 收稿日期:2021-05-08 出版日期:2021-12-10 发布日期:2021-08-11
  • 通讯作者: 段忆翔 E-mail:wenwentp@163.com;yduan@scu.edu.cn
  • 作者简介:李雯雯, 女, 博士, 讲师, 主要从事基于呼出气的代谢组学研究. E-mail: wenwentp@163.com
  • 基金资助:
    四川省重大科学仪器设备专项项目(2019ZDZX0036)

Characteristic Analysis of C1—C3n-Aldehydes and n-Alcohols in Proton Transfer Reaction Time-of-flight Mass Spectrometry

WANG Ruxin1, ZHAO Zhongjun2, HE Feiyao1, YUE Hanlu1, DENG Fulong1, LI Hong1, LI Wenwen3(), DUAN Yixiang1()   

  1. 1.College of Life Science
    2.College of Chemical Engineering
    3.West China of Public Health and West China Forth Hospital,Sichuan University,Chengdu 610064,China
  • Received:2021-05-08 Online:2021-12-10 Published:2021-08-11
  • Contact: DUAN Yixiang E-mail:wenwentp@163.com;yduan@scu.edu.cn
  • Supported by:
    the Special Project of Major Scientific Instruments and Equipment in Sichuan Province, China(2019ZDZX0036)

摘要:

为分析C1~C3正构醛、 醇化合物在质子转移反应飞行时间质谱(PTR-TOF MS)中的产物离子特征, 考察了不同E/N值(E: 电场强度, N: 气体分子数密度)下C1~C3正构醛、 醇的产物离子种类和强度的变化. 结果表明, 低分子量正构醇类(甲醇、 乙醇和丙醇)倾向于形成质子化聚合物[nMH]+及其失水离子[nMH-H2O]+, 且随着E/N值升高, 醇类会产生较多裂解碎片和多聚体离子. 低分子量正构醛(甲醛、 乙醛和丙醛)主要产生质子化产物[MH]+和一水合质子化产物[M·H3O]+, 高E/N值(>125 Td)会抑制甲醛质子化, 也会抑制其加合产物的生成. 乙醛倾向于形成水加合物, 且随着E/N值增高, 质子化乙醛与水合质子化乙醛的变化趋势相反. 另外, 丙醛在较高的E/N值下会产生一系列聚合物, 如[MH·C2H5]+和[2MH]+. 通过分析C1~C3正构醛、 醇的质子转移反应特征及产物离子形成过程, 获得了C1~C3正构醛、 醇的特征离子和对应的最佳E/N设置值, 为低分子量醛、 醇的定性分析提供了重要依据.

关键词: 质子转移反应质谱, C1~C3正构醇、 醛, 飞行时间质谱

Abstract:

Proton transfer reaction time-of-flight mass spectrometer(PTR-TOF-MS) is a kind of soft chemical ionization mass spectrometry instrument, which can realize real-time online detection of trace volatile organic compounds. The E/N value(E: electric field intensity, N: gas molecule number density) is an important parameter in the proton transfer reaction, which will affect the type and content of product ions. Herein, the effects of different E/N values on the types and relative strengths of C1—C3n-aldehydes and n-alcohol product ions were systematically investigated, and the proton transfer reaction characteristics of C1—C3 n-aldehydes and n-alcohols as well as the formation pathways of fragment ions were studied. The results show that low molecular weight n-alcohols(methanol, ethanol and propanol) tend to form protonated polymers [nMH]+ and their dehydrated ions [nMH-H2O]+, and as the E/N value increases, n-alcohols will produce more fragments and polymer ions. Low molecular weight n-aldehydes(formaldehyde, acetaldehyde and propanal) mainly produce protonated products [MH]+ and monohydrate protonated products [M·H3O]+. High E/N value(>125 Td) will inhibit the protonation of formaldehyde and the formation of its adducts. Acetaldehyde is more inclined to form water adducts, and the change trend of [CH3CHOH]+ and [CH3CHOH·H2O]+ is opposite with the increase of E/N value. In addition, propanal will produce a series of polymers([C2H5CHOH·C2H5+, [C2H5CHOH·C2H5CHO]+) at higher E/N values. In this paper, the best analytical E/N values and characteristic fragment ions of C1—C3n-aldehydes and n-alcohols were obtained, which is expected to provide an important basis for the qualitative and quantitative analysis of low molecular weight aldehydes and alcohols.

Key words: Proton transfer reaction mass spectrometer, C1—C3n-aldehydes and n-alcohols, Time-of-flight mass spectrometry

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