Identification of pentacyclic triterpenes by GC-MS-MS
| Autor: | Alfredo Galvez-Sinibaldi, R. Paul Philp, Istvan Hazai |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Chromatography Chemistry Stereochemistry General Chemical Engineering Tandem mass spectrometry chemistry.chemical_compound Fragmentation (mass spectrometry) Triterpene Gas chromatography Pentacyclic Triterpenes Gas chromatography–mass spectrometry Oleanane Electron ionization |
| Zdroj: | Journal of High Resolution Chromatography. 15:791-794 |
| ISSN: | 1521-4168 0935-6304 |
| DOI: | 10.1002/jhrc.1240151204 |
| Popis: | The development of tandem mass spectrometry (MS-MS) and its combination with gas chromatography (GC-MS-MS) has greatly enhanced our ability to analyze exceedingly complex mixtures from a wide variety of sources, including fossil fuels. This paper describes a comparison of the conventional electron impact (El) mass spectral fragmentation patterns, obtained in the MS-MS precursor – product mode, of three oleanane isomers and one ursene, all of which are used as indicators of higher plant input to the sedimentary environment Results show that El and collision-activated dissociation (CAD) spectra are most similar at collision energies between −15 and −20 eV.The presence of methyl substituents in these pentacyclic terpenes plays an important role in the process of ring fragmentation: the daughter spectra of the M – 15 fragments can be used to obtain structural information, such as the positions of the double bonds. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text