期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1589, 期 -, 页码 134-140出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2019.01.006
关键词
Comprehensive two-dimensional gas; chromatography-mass spectrometry; Electron ionization; Soft ionization; Mass spectrometry
资金
- Merck Life Science [AGER2-Rif 2016-0169]
The present research is based on the use of comprehensive two-dimensional gas chromatography-quadrupole mass spectrometry (GC x GC-QMS), using milder electron ionization (El) conditions. The term milder refers to the use of lower energy El conditions (e.g., 20 eV), instead of the most common electron energy of 70 eV. The effects of using lower source temperatures were also evaluated. Within such an analytical context, GC x GC-QMS was applied to the analysis of a variety of different molecular-mass compounds with various polarities (sterols, linear alkanes, fatty acid methyl esters, vitamin E, squalene, a linear alcohol, and a group of fifteen pesticides). In general, the results attained indicate that milder El conditions, and lower source temperatures, generate mass spectra with a higher relative abundance of ions at higher mass-over-charge (m/z) values, comprising the molecular ion, and reduced fragmentation at lower m/z values. The extent to which such a phenomenon occurred was obviously related to the chemical structure of each analyte. Spectral repeatability was also assessed, and was found to be satisfactory. Finally, with regard to analyte signal-to-noise ratios these were generally comparable in applications involving different electron ionization energies. (C) 2019 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据