Hydroxytyrosol-rich composition from olive vegetation water and method of use thereof
The invention provides olive-derived hydroxytyrosol. According to one aspect of the invention, vegetation water is collected from olives. Acid is added to stabilize the vegetation water and prevent fermentation. The mixture is incubated to allow oleuropein to convert to hydroxytyrosol, and then fractionated to separate hydroxytyrosol from other components. The hydroxytyrosol is useful as a therapeutic and anti-oxidant for a variety of health purposes, including for the treatment of skin damage. In addition, the hydroxytyrosol is useful as a natural anti-bacterial, anti-viral and fungicidal product for agricultural and pest control applications.
1. A method of producing a hydroxytyrosol-rich composition, comprising
(a) producing vegetation water from olives, wherein said vegetation water comprises oleuropein;
(b) adding acid to the vegetation water thereby producing acidified vegetation water; and
(c) incubating the acidified vegetation water for a period until (i) at least 50% of oleuropein originally present in the vegetation water has been converted to hydroxytyrosol, and (ii) the vegetation water has a weight ratio of hydroxytyrosol to tyrosol of between about 3:1 and about 50:1.
2. The method of claim 1 , wherein said incubating is carried out until at least 75% of oleuropein originally present in the vegetation water has been converted to hydroxytyrosol.
3. The method of claim 1 , wherein said incubating is carried out for a period of at least 2 months, and until at least 90% of oleuropein originally present in the vegetation water has been converted to hydroxytyrosol.
4. The method of claim 1 , wherein said producing step comprises producing vegetation water from the meat or pulp of depitted olives.
5. The method of claim 4 , wherein the incubating is carried out until the vegetation water has a weight ratio of hydroxytyrosol to oleuropein of between about 1:1 and about 200:1.
6. The method of claim 5 , wherein the incubating is carried out until the vegetation water has a weight ratio of hydroxytyrosol to oleuropein of between about 4:1 and about 200:1.
7. The method of claim 6 , wherein, the incubating is carried out until the vegetation water has a weight ratio of hydroxytyrosol to oleuropein of between about 10:1 and about 100:1.
8. The method of claim 1 , wherein the incubating is carried out until the vegetation water has a weight ratio of hydroxytyrosol to tyrosol of between about 5:1 to about 30:1.
9. The method of claim 1 , which further comprises fractionating the incubated vegetation water to separate hydroxytyrosol from other components.
10. The method of claim 1 , which further comprises extracting the incubated vegetation water with an organic solvent to produce a fraction enriched by 20% or more in hydroxytyrosol.
11. The method of claim 10 , which further comprises the purification of hydroxytyrosol by chromatography.
12. The method of claim 10 wherein the organic solvent is ethyl acetate.
13. The method of claim 1 , wherein said acid is added in an amount effective to produce a pH between about 1 and about 5.
14. The method of claim 1 , wherein said acid is added in an amount effective to produce a pH between about 2 and about 4.
15. The method of claim 1 , wherein said acid is citric acid.
16. The method of claim 1 , wherein the concentration of hydroxytyrosol in the vegetation water from (c) ranges from 4 grams per liter to 15 grams per liter.
17. The method of claim 1 , wherein said incubating is for a period of at least two months.
18. The method of claim 1 wherein said incubating is for a period of approximately twelve months.