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1. (WO2017134260) LIGHT-STABLE HOP EXTRACT
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CLAIMS

1. A method of preparing a light-stable hop extract, said method comprising:

• providing a pre-isomerised hop extract comprising at least 10% of iso-alpha acids by weight of dry matter,

• illuminating the pre-isomerised hop extract, optionally after dilution of the pre- isomerised hop extract, with an illumination intensity of at least 50 W/m2 for at least 30 minutes.

2. Method according to claim 1, wherein the pre-isomerised hop extract is illuminated with light having a maximum intensity at a wavelength in the range of 200-800 nm, preferably in the range of 250-600 nm, most preferably in the range of 300-500 nm.

3. Method according to claim 1 or 2, wherein the pre-isomerised hop extract is illuminated with an illumination intensity that exceeds 100 W/m2, preferably with an illumination intensity that exceeds 200 W/m2.

4. Method according to any one of the preceding claims, wherein the pre-isomerised hop extract is illuminated with the specified illumination intensity for at least 1 hour, preferably for 2-48 hours.

5. Method according to any one of the preceding claims, wherein the temperature of the hop extract remains within the range of 0-100°C, preferably within the range of 15-80°C during the illumination.

6. Method according to any one of the preceding claims, wherein the method comprises:

• diluting the pre-isomerised extract with water to produce an aqueous solution; and

• illuminating an aqueous solution of the pre-isomerised hop extract.

7. Method according to claim 6, wherein the aqueous diluted solution of the pre-isomerised hop extract has an iso-alpha acid content in the range of 0.2-200 g/1, preferably of 0.5-70 g/1 and more preferably of 1-25 g/1 when the illuminations starts.

8. Method according to claim 6 or 7, wherein the aqueous diluted solution of the pre- isomerised hop extract contains at least 80 wt.% water, preferably at least 90 wt.% water, more preferably at least 95 wt.% water.

9. A light-stable pre-isomerised hop extract that is obtainable, preferably that is obtained by the method according to any one of the preceding claims.

10. Hop extract according to claim 9, wherein the hop extract contains at least 1 % of iso-alpha acids by weight of dry matter.

11. Hop extract according to claim 9 or 10, wherein the hop extract contains alpha-acids in a concentration of 0-10% by weight of dry matter, preferably of 0-3% by weight of dry matter and more preferably of 0.01-2% by weight of dry matter.

12. Hop extract according to any one of claims 9-11, wherein the hop extract contains beta- acids in a concentration of 0-10% by weight of dry matter, preferably of 0-5% by weight of dry matter.

13. Hop extract according to any one of claims 9-12, wherein the hop extract contains reduced iso-alpha acids in a concentration that does not exceed 10% by weight of the iso-alpha acids, preferably does not exceed 3%> by weight of the iso-alpha acids; said reduced iso-alpha acids being selected from dihydro-iso-alpha acids, tetrahydro-iso-alpha acids, hexahydro -iso- alpha acids and combinations thereof.

14. A process of preparing a beer, said process comprising introducing a light-stable pre- isomerised hop extract according to any one of claims 9-13.

15. Process according to claim 14, wherein the hop extract is introduced into wort or beer in a concentration of at least 2 mg/1, preferably in a concentration of 5-200 mg/1, more preferably in a concentration of 10-150 mg/1.