Patent ID: 7833552

Claim:
A method of preparing from hops a composition having a high xanthohumol content, the method comprising: providing a first solution containing hop substances and a first solvent, wherein the hop substances include 0.4-20% by weight xanthohumol and the first solvent includes up to 90% by volume water and at least 3% by volume a water miscible solvent; adjusting the salt concentration of the first solution to 0.05 M to 5.0 M and the pH value of the first solution to 10.5-12.0 to effect formation of a first precipitate; removing the first precipitate to obtain a second solution; adjusting the pH of the second solution to 7-8 to effect formation of a second precipitate; and collecting the second precipitate, wherein the second precipitate contains 40-95% by weight xanthohumol.