METHOD OF PREPARING PLANT EXTRACTS WITH A REDUCED CONTENT OF UNPOLAR ENVIRONMENTAL CONTAMINANTS

摘要

The present invention relates to a method of preparing a plant extract, with the exception of an extract of Ginkgo biloba, with a content of unpolar environmental contaminants which is reduced over that of the starting extract, characterized by the following process steps: (a) preparation of an aqueous-ketonic or aqueous-alcoholic solution of a starting extract, (b) (i) applying the solution to an adsorber resin and (ii) eluting the adsorber resin with an aqueous C₃-C₆-ketone of an aqueous C₁-C₃-alcohol, and/or (c) extracting the solution thus obtained, or the solution of the starting extract, with a C₅-C₇ and hydrocarbon or mixtures thereof, and removal of the hydrocarbon phase, and (d) if appropriate, concentrating-drying the resulting solution to give a dry extract. The invention furthermore relates to a plant extract (liquid extract or spissum extract, but also dry extract) with a content of unpolar environmental contaminants which is reduced over that of the starting extract, obtainable by the method according to the invention, and to a composition comprising this plant extract (for example pharmaceutical, foodstuff or other preparations).