Intramolecular carbon isotopic composition of monosodium glutamate: Biochemical pathways and product source identification

William B. Savidge*, Neal E. Blair

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Monosodium glutamate (MSG) obtained as trade samples from several manufacturers was studied to determine the range of its intramolecular 13C/12C composition. Although the carbon isotopic composition of the total MSG molecule did not differ among manufacturers in most instances, significant differences were observed in the isotopic composition of the α-carboxyl carbon, suggesting that different proprietary strains of industrial microorganisms or MSG purification methods may impart unique isotopic fingerprints upon their products. The 13C depletion of the α-carboxyl carbon relative to the rest of the molecule helps constrain the identity of the potential anapleurotic carboxylating enzymes responsible for its fixation.

Original languageEnglish (US)
Pages (from-to)197-201
Number of pages5
JournalJournal of Agricultural and Food Chemistry
Volume53
Issue number2
DOIs
StatePublished - Jan 26 2005

Keywords

  • Anapleurotic pathway
  • Carbon isotopes
  • Intramolecular isotope distribution
  • Monosodium glutamate

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)

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