Comparison of carbon isotope ratio measurement of the vanillin methoxy group by gc-irms and 13c-qnmr
Site-specific carbon isotope ratio measurements by quantitative 13C NMR (13C-qNMR), Orbitrap-MS, and GC-IRMS offer a new dimension to conventional bulk carbon isotope ratio measurements used in food provenance, forensics, and a number of other applications. While the site-specific measurements of ca...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2024
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| In: |
Journal of the American Society for Mass Spectrometry
Year: 2024, Jahrgang: 35, Heft: 3, Pages: 100-105 |
| ISSN: | 1879-1123 |
| DOI: | 10.1021/jasms.3c00327 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/jasms.3c00327
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| Verfasserangaben: | Markus Greule, Phuong Mai Le, Juris Meija, Zoltán Mester, and Frank Keppler |
MARC
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| 245 | 1 | 0 | |a Comparison of carbon isotope ratio measurement of the vanillin methoxy group by gc-irms and 13c-qnmr |c Markus Greule, Phuong Mai Le, Juris Meija, Zoltán Mester, and Frank Keppler |
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| 520 | |a Site-specific carbon isotope ratio measurements by quantitative 13C NMR (13C-qNMR), Orbitrap-MS, and GC-IRMS offer a new dimension to conventional bulk carbon isotope ratio measurements used in food provenance, forensics, and a number of other applications. While the site-specific measurements of carbon isotope ratios in vanillin by 13C-qNMR or Orbitrap-MS are powerful new tools in food analysis, there are a limited number of studies regarding the validity of these measurement results. Here we present carbon site-specific measurements of vanillin by GC-IRMS and 13C-qNMR for methoxy carbon. Carbon isotope delta (δ13C) values obtained by these different measurement approaches demonstrate remarkable agreement; in five vanillin samples whose bulk δ13C values ranged from −31‰ to −26‰, their δ13C values of the methoxy carbon ranged from −62.4‰ to −30.6‰, yet the difference between the results of the two analytical approaches was within ±0.6‰. While the GC-IRMS approach afforded up to 9-fold lower uncertainties and required 100-fold less sample compared to the 13C-qNMR, the 13C-qNMR is able to assign δ13C values to all carbon atoms in the molecule, not just the cleavable methoxy group. | ||
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