Molecular Characterization of Volatiles and Petrochemical Base Oils by Photo-Ionization GC×GC-TOF-MS
| Autor: | Jean-François Focant, Robert B. Cody, Marion Coutriade, Amandine Racaud, John Dane, Anupam Giri, Koji Okuda |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
010401 analytical chemistry Analytical chemistry 02 engineering and technology Photoionization 021001 nanoscience & nanotechnology Mass spectrometry 01 natural sciences Ion source 0104 chemical sciences Analytical Chemistry Ion Comprehensive two-dimensional gas chromatography Ionization Gas chromatography 0210 nano-technology Electron ionization |
| Zdroj: | Analytical chemistry. 89(10) |
| ISSN: | 1520-6882 |
| Popis: | The characterization of organic mixtures by comprehensive two-dimensional gas chromatography (GC×GC) coupled to electron impact (EI) ionization time-of-flight mass spectrometry (TOF-MS) allows the detection of thousands of compounds. However, owing to the exhaustive fragmentation following EI ionization, despite the use of mass spectral libraries, a majority of the compounds remains unidentified because of the lack of parent ion preservation. Thus, soft-ionization energies leading to organic compounds being ionized with limited or no fragmentation, retaining the molecular ion, has been of interest for many years. In this study, photoionization (PI) was evaluated as the ion source for GC×GC-TOF-MS measurements. First, capabilities and limitations of PI were tested using an authentic mixture of compounds of several chemical classes. Ionization energy exhibited by PI, equivalent to 10.8 eV, resulted in significant retention of molecular ion information; [M]+• for alkanes, ketones, FAMEs, aromatics, [M–H]+• f... |
| Databáze: | OpenAIRE |
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