Process for extracting catechuic polyphenols from...

C - Chemistry – Metallurgy – 07 – D

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C07D 311/62 (2006.01) A61K 31/35 (2006.01) A61K 7/00 (1995.01)

Patent

CA 2202297

The invention concerns a process for extracting essentially oligomeric catechuic polyphenols from cinquefoil. The process involves the following steps: a) the whole plant, or a part of the plant, is treated with a polar organic solvent, either pure or mixed with water; b) the extract from step (a) is evaporated to dryness at a temperature of at most 60 degrees C; c) the residue from step (b) is dissolved in water and the resulting aqueous solution is subjected to extraction using a solvent which is immiscible in water and able to dissolve oligomeric catechuic polyphenols; d) the organic solution from step (c) is evaporated to dryness at a temperature of at most 60 degrees C. The invention also concerns the extract thus obtained and its use as a compound that acts against radicals and/or UV radiation.

L'invention concerne un procédé d'extraction de polyphénols catéchiques essentiellement oligomères à partir de potentilles, qui comporte les étapes suivantes: a) la plante entière ou une partie de la plante est traitée par un solvant organique polaire, pur ou en mélange avec de l'eau, b) l'extrait obtenu à l'étape a) est évaporé à sec à une température d'au plus 60°C, c) le résidu d'évaporation de l'étape b) est repris par l'eau, puis la solution aqueuse obtenue est épuisée par un solvant non-miscible à l'eau et susceptible de dissoudre les polyphénols catéchiques oligomères, d) la solution organique de l'étape c) est évaporée à sec à une température d'au plus 60°C. L'invention concerne également l'extrait obtenu et son utilisation comme composé ayant une action antiradicalaire et/ou contre les rayons UV.

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