Preparation of St. John’s wort (Hypericum) extracts in the components of ointment bases
Successive extraction of St. John's wort (Hypericum) herb with a number of extractants of increasing polarity makes it possible to obtain extracts with a broad spectrum of the biologically active substances of St. John's wort: anthracene derivatives, flavonoids, and chlorophylls. Evaporation of liquid extracts in the presence of the components of ointment bases forms a product that is a St. John's wort extract as a thick (dense) pasty emulsion that is readily compatible with lipophilic and hydrophilic ointment and suppository bases.