Sodium periodate oxidation of caffeic acid was investigated in aqueous solutions with pH ranging from 2 to 7. Products formed from quinone evolution were monitored by HPLC. It was found that they were affected both qualitatively and quantitatively by the conditions of the reaction. The rate and the yield of the reaction increased with the pH. In particular, two products obtained at pH values lower than 4.6 approximately, were analysed and isolated by reverse phase HPLC. By using H-1 and C-13 NMR and mass spectrometries, these compounds were shown to be two stereoisomers of 2,5-(3',4'-dihydroxyphenyl)tetrahydrofuran 3,4-dicarboxylic acid.
机构:Instituí des Produits de la Vigne, Laboratoire des Polyméres et des Techniques Physico-chimiques, Instituí National de la Recherche Agronomique, 34060 Montpellier Cedex
CHEYNIER, V
MOUTOUNET, M
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机构:Instituí des Produits de la Vigne, Laboratoire des Polyméres et des Techniques Physico-chimiques, Instituí National de la Recherche Agronomique, 34060 Montpellier Cedex
机构:Instituí des Produits de la Vigne, Laboratoire des Polyméres et des Techniques Physico-chimiques, Instituí National de la Recherche Agronomique, 34060 Montpellier Cedex
CHEYNIER, V
MOUTOUNET, M
论文数: 0引用数: 0
h-index: 0
机构:Instituí des Produits de la Vigne, Laboratoire des Polyméres et des Techniques Physico-chimiques, Instituí National de la Recherche Agronomique, 34060 Montpellier Cedex