A new method to analysis synthetic acetic acid to vinegar: Hydrogen isotope ratio at the methyl site of acetic acid in vinegar by GC-IRMS.
Food Chem
; 451: 139443, 2024 Sep 01.
Article
em En
| MEDLINE
| ID: mdl-38678658
ABSTRACT
Acetic acid is the key organic substance used to verify the authenticity of vinegar. A new method for precisely determining acetic acid δDCH3 in vinegar via gas chromatography -pyrolytic-stable isotope ratio mass spectrometry (GC-P-IRMS) was established. The δDCH3 values were obtained via calibration with a series of standards. The optimised method demonstrated a repeatability standard deviation within 3 . The standard deviation of accuracy of the new method compared with that of the SNIF-NMR method was within 2.6 . The synthetic acetic acid δDCH3 values was -136.7 ± 29.6 , and the δDCH3 value of acetic acid in vinegar was -414.9 ± 40.5 , with significant isotopic distribution characteristics. This methodology serves as a supplementary method for measuring the δDCH3 value of acetic acid in vinegar. It has advantages over other methods in terms of time, sensitivity and operability. And provides a new idea for solving the problem of analyzing substances in the presence of exchangeable groups.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ácido Acético
/
Cromatografia Gasosa-Espectrometria de Massas
Idioma:
En
Revista:
Food Chem
Ano de publicação:
2024
Tipo de documento:
Article