Intramolecular Carbon Isotopic Composition of Monosodium Glutamate: Biochemical Pathways and Product Source Identification
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- 作者：William B. Savidge and Neal E. Blair
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2005
- 出版时间：January 26, 2005
- 年：2005
- 卷：53
- 期：2
- 页码：197 - 201
- 全文大小：83K
- 年卷期：v.53,no.2(January 26, 2005)
- ISSN：1520-5118
文摘
Monosodium glutamate (MSG) obtained as trade samples from several manufacturers was studiedto determine the range of its intramolecular 13C/12C composition. Although the carbon isotopiccomposition of the total MSG molecule did not differ among manufacturers in most instances,significant differences were observed in the isotopic composition of the 
-carboxyl carbon, suggestingthat different proprietary strains of industrial microorganisms or MSG purification methods may impartunique isotopic fingerprints upon their products. The 13C depletion of the -carboxyl carbon relativeto the rest of the molecule helps constrain the identity of the potential anapleurotic carboxylatingenzymes responsible for its fixation.Keywords: Monosodium glutamate; carbon isotopes; anapleurotic pathway; intramolecular isotopedistribution
-carboxyl carbon, suggestingthat different proprietary strains of industrial microorganisms or MSG purification methods may impartunique isotopic fingerprints upon their products. The 13C depletion of the -carboxyl carbon relativeto the rest of the molecule helps constrain the identity of the potential anapleurotic carboxylatingenzymes responsible for its fixation.Keywords: Monosodium glutamate; carbon isotopes; anapleurotic pathway; intramolecular isotopedistribution