title: Origin and significance of the production of carbon dioxide during the ozonization of 13C-labeled D-glucose at different pH values.
abstract: [1-(13)C], [2-(13)C] and [6-(13)C] D-glucose were, respectively, ozonized in a semi-batch reactor in acidic and basic conditions. The composition of the gas phase was evaluated by on-line mass spectrometry measurements. The quantitative and isotopic analyses of the carbon dioxide formed during ozonization are presented and discussed. The data, correlated with previous literature results, clearly show that at pH 2.5 the production of carbon dioxide from C-6 and C-1 carbon atoms is nearly equivalent. Conversely, at higher pH values, CO(2) is released with a greater selectivity from the reducing end. The importance of the decarboxylation reaction in the formation of by-products with fewer than six carbon atoms is also demonstrated.
authors.affiliation: Laboratoire d'Ingénierie Moléculaire pour la Séparation et les Applications des Gaz, LIMSAG UMR 5633, Faculté des Sciences Gabriel, Université de Bourgogne 6, Boulevard Gabriel, F-21100 Dijon, France.
authors.forename: O
authors.initials: O
authors.lastname: Marcq
authors.forename: J M
authors.initials: JM
authors.lastname: Barbe
authors.forename: A
authors.initials: A
authors.lastname: Trichet
authors.forename: R
authors.initials: R
authors.lastname: Guilard
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002247:Carbon Isotopes; D005947:Glucose / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry; D010126:Ozone / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D002245:Carbon Dioxide; D010126:Ozone; D005947:Glucose