EXTRACTION OF HYPERFORIN AND HYPERICIN FROM ST. JOHN'S WORT (HYPERICUM PERFORATUM L.) WITH DIFFERENT SOLVENTS

摘要

The extraction of St. John's wort (Hypericum perforatum L.) was carried out with different solvents to obtain valuable components and natural agents rich extracts. Further aim of this study was to compare the raw materials that were gathered at the beginning and the end of the blossoming.nnFor the laboratory Soxhlet extraction of St. John's wort four different solvents (n-hexane, ethyl acetate, 2-propanol, ethanol) were applied. Increasing the polarity of solvents higher extraction yields were achieved (43–360 g/kg). Pilot plant experiments were performed in a 5·10-3 m3 volume Soxhlet extractor with ethanol and in a 5·10-3 m3 volume high-pressure vessel at 313K and 45 MPa with supercritical CO2. The extract samples were analyzed by UV-visible spectrophotometry and high-performance liquid chromatography methods.nnThe effective extraction of both main compounds (hypericin and hyperforin) was achieved. The sample gathered at the end of the blossoming extracted with nonpolar solvent (sc-CO2) at mild temperature (∼313K) provided stable hyperforin rich extract. The sample gathered at the begining of the blossoming extracted with polar solvent (ethanol) at mild temperature (∼313K) provided stable hypericin rich extract.