Patent ID: 8236993

Claim:
A process of producing an extract containing hydroxytyrosol from a starting material selected from olives and/or pomaces residues of olives after an extraction of olive oil, said process including acid hydrolysis of said starting material and purification of the resulting solution, the process comprising: a) carrying out said acid hydrolysis of said starting material in water at a temperature within the range of 70° C. to 140° C., at a pressure within the range of atmospheric pressure to 20 psi above the atmospheric pressure and at a pH within the range of 1.0 to 6.0; b) removing suspended solids from the hydrolysis water solution of step a) to obtain a clarified aqueous solution; c) loading a product (A) obtained from step b) in a chromatographic column of a resin selected from acid activated anion exchange resins to retain hydroxytyrosol, d) eluting the products retained over said chromatographic resin with water; e) loading a solution (B) obtained from step d) in a second chromatographic column of a resin selected from adsorbent non-ionic resins, to retain hydroxytyrosol; f) eluting the products retained over said second chromatographic resin with water.