| abstract |
Procedure for the preparation of a medicinal extract containing hydroxystilbene, in a) a hydroxyl stilbene containing part of a medicinal plant is provided, if necessary in crushed form, b) it is mixed with an aqueous extraction agent, c) then if the extraction agent acts, a liquid extract phase of the mixture is obtained and the extraction is repeated several times, and d) the extraction agent is removed from the liquid extract phases thus obtained, an extraction being carried out with an agent of aqueous extraction at a pH value of the mixture in the alkaline range. |