A process for purification of proanthocyanidin oligomer

C - Chemistry – Metallurgy – 07 – D

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C07D 311/62 (2006.01) C07D 311/60 (2006.01)

Patent

CA 2370238

Methods for purifying proanthocyanidin oligomers which contain di- to pentamers including: A) a method comprising effecting solid/liquid extraction of a material containing the above oligomers or a crude purification product thereof by using methyl acetate as the liquid phase; B) a method comprising preliminarily treating a material containing the above oligomers, a crude purification product thereof or a solution of the same with a hydrolase; and C) a method comprising subjecting a material containing the above oligomers or a crude purification product thereof to normal phase silica gel liquid chromatography by using as a mobile phase a solvent selected from the group consisting of ester solvents, ketone solvents, hydrocarbon solvents, ether solvents and alcohol solvents or a mixture of two or more of the same to thereby separate and purify the oligomers into individual homogeneous oligomers depending on the degree of polymerization.

L'invention concerne des méthodes de purification d'oligomères de proanthocyanidine contenant des dimères à pentamères. Ces méthodes consistent à: a) utiliser un acétate de méthyle comme phase liquide pour réaliser une extraction solide-liquide d'une matière contenant lesdits oligomères ou d'un produit de purification brut obtenu à partir desdits oligomères; b) utiliser une hydrolase pour effectuer un traitement préliminaire d'une matière contenant lesdits oligomères, d'un produit de purification brut obtenu à partir desdits oligomères ou d'une solution desdits éléments; et c) soumettre la matière contenant lesdits oligomères ou un produit de purification brut obtenu à partir desdits oligomères à une chromatographie de partage en phase liquide sur gel de silice, en utilisant comme phase mobile un solvant sélectionné dans le groupe constitué par des solvants d'ester, des solvants de cétone, des solvants d'hydrocarbures, des solvants d'éther et des solvants d'alcool, ou un mélange de deux ou plusieurs desdits solvants, ce qui permet de séparer et de purifier les oligomères pour obtenir des oligomères individuels homogènes selon le degré de polymérisation.

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