Process for extraction of proanthocyanidins from botanical...

Details Process for extraction of proanthocyanidins from botanical... Process for extraction of proanthocyanidins from botanical...

C - Chemistry, Metallurgy

07

D

C07D 311/62 (2006.01) C09K 15/34 (2006.01)

Patent

CA 2227777

A method for extraction and isolation of proanthocyanidins from botanical material. The method includes the steps of hot water extraction of the material after comminution using deoxygenated water, separation of the solids from the liquor, partitioning a liquor into a concentrated solution and waste streams by a method selected from ultra-filtration, reverse osmosis and a combination of the two in series, and drying the concentrated solution to a solid product. The hot water can be recycled. The residue results in a usable by-product and the tannins can be extracted from the tannin-rich stream. The most preferred botanical material is bark from Pinus radiata trees which are 15 years old, the bark most optionally coming from the upper portion of the tree.

L'invention porte sur un procédé d'extraction et d'isolement de proanthocyanidines contenues dans des substances botaniques consistant: en une extraction à l'eau chaude de la substance après fragmentation à l'aide d'eau désoxygénée, en une séparation des solides d'avec la liqueur, en une scission de la liqueur en une solution concentrée et des courants de déchets par un procédé choisi entre l'ultrafiltration, l'osmose inverse ou la combinaison des deux en série, et en la dessiccation de la solution concentrée qui donne le produit final. L'eau chaude peut être recyclée. Les résidus forment un sous-produit utilisable et les tanins peuvent être extraits du courant riche en tanin. La substance botanique la plus recommandée est l'écorce du Pinus radiata de 15 ans, prélevée de préférence à la partie supérieure de l'arbre.

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