Comparison of carbon isotope ratio measurement of the vanillin methoxy group by GC-IRMS and ¹³C-qNMR

Téléchargement	Voir la version finale : Comparison of carbon isotope ratio measurement of the vanillin methoxy group by GC-IRMS and ¹³C-qNMR (PDF, 1.6 Mio)
DOI	Trouver le DOI : https://doi.org/10.1021/jasms.3c00327
Auteur	Rechercher : Greule, Markus Identifiant ORCID : https://orcid.org/0000-0002-9958-8371; Rechercher : Le, Phuong Mai¹Identifiant ORCID : https://orcid.org/0000-0002-6101-5252; Rechercher : Meija, Juris¹Identifiant ORCID : https://orcid.org/0000-0002-3349-5535; Rechercher : Mester, Zoltán¹Identifiant ORCID : https://orcid.org/0000-0002-2377-2615; Rechercher : Keppler, Frank Identifiant ORCID : https://orcid.org/0000-0003-2766-8812
Affiliation	Conseil national de recherches Canada. Centre de recherche en métrologie
Bailleur de fonds	Rechercher : Deutsche Forschungsgemeinschaft
Format	Texte, Article
Sujet	site-specific carbon isotope; vanillin methoxy group; GC-IRMS; ¹³C-qNMR
Résumé	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.
Date de publication	2023-11-28
Maison d’édition	American Chemical Society
Licence	Creative Commons, Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/deed.fr
Dans	Journal of the American Society for Mass Spectrometry 35, nº 1 (28 novembre 2023) : 100–105.
Langue	anglais
Publications évaluées par des pairs	Oui
Exporter la notice	Exporter en format RIS
Signaler une correction	Signaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement	31fb786d-009c-49ca-bec7-0e2917349597
Enregistrement créé	2024-01-08
Enregistrement modifié	2024-09-24

Détails de la page

Par :

Conseil national de recherches Canada

Date de modification :: 2026-06-14