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| Titel: |
Application of liquid chromatography-nuclear magnetic resonance spectroscopy for the identification of ethyldimethylpyrazine, a food flavouring agent |
| Auteur: |
Sugimoto, Naoki Yomota, Chikako Furusho, Noriko Sato, Kyoko Yamazaki, Takeshi Tanamoto, Kenichi |
| Verschenen in: |
Food additives and contaminants. Pt. A, Chemistry, analysis, control, exposure & risk assessment |
| Paginering: | Jaargang 23 (2006) nr. 12 pagina's 1253-1259 |
| Jaar: |
2006-12-01 |
| Inhoud: |
The application of liquid chromatography-nuclear magnetic resonance spectroscopy (LC-NMR) for the direct identification of ethyldimethylpyrazine, a food flavouring agent, has been studied. The commercial product is a mixture of two regio-isomers, 2-ethyl-3,5-dimethylpyrazine (1) and 2-ethyl-3,6-dimethylpyrazine (2); however, the exact composition of the mixture is unknown. Structural characterization by LC-MS and GC-MS was not possible because both regio-isomers yield the same molecular related ion and ion fragmentation. To rapidly identify the two regio-isomers, the product was analyzed by LC-NMR with on-flow and fraction loop modes. From the results, the structure elucidations of the two regio-isomers could be carried out without the need to isolate the isomers by the usual procedures. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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