Preparation of isomerized hop extracts
阅读：665发布：2021-01-17
专利汇可以提供Preparation of isomerized hop extracts专利检索，专利查询，专利分析的服务。并且Alpha-acids in hop extracts are isomerized by forming a salt of the alpha-acids in a water immiscible organic solvent with a base selected from oxides, hydroxides and carbonates of calcium, magnesium, strontium, barium and zinc and heating the alpha-acid salt in the solvent to form iso-alpha-acid salts. Iso-alpha-acids may be recovered in crude form and used for bittering beer.，下面是Preparation of isomerized hop extracts专利的具体信息内容。
1. A METHOD FOR ISOMERIZING A-ACIDS WHICH COMPRISES CONTACTING A SOLUTION CONSISTING ESSENTIALLY OF AN A-ACIDSCONTAINING UNISOMERIED HOP EXTRACT IN A WATER IMMISCIBLE ORGANIC SOLVENT WITH A SUBSTANTIALLY STOICHIMERIC AMOUNT OF A BASE SELECTED FROM THE GROUP CONSISTING OF THE OXIDES, HYDROXIDES AND CARBONATES OF CALCIUM, MAGNESIUM, STRONTIUM, BARIUM AND ZINC, TO FORM THE CORRSPONDING SALT OF THE A-ACIDS AND HEATING THE MIXTURE SUFFICIENTLY TO FORM THE CORRESPONDING SALT OF THE ISO-A-ACIDS, AND RECOVERING AN ISOMERISED HOP EXTRACT CONTAINING SAID SALT OF THE ISO-A-ACIDS FROM THE WATER IMMISCIBLE SOLVENT.
2. A method according to claim 1, wherein said unisomerised hop extract contains Alpha -acids, Beta -acids and hop oils.
3. A method according to claim 2, wherein said water immiscible solvent is selected from the group consisting of toluene, benzene, xylene and petroleum hydrocarbons.
4. A method according to claim 3, wherein free iso- Alpha -acids are formed after the isomerisation in the water immiscible solvent by redissolving any precipitate with addition of (i) a water immiscible lower alcohol, (ii) sufficient water to form a separate aqueous alcoholic layer, and (iii) sufficient acid to release free iso- Alpha -acids in a water immiscible layer, and separating the aqueous alcoholic layer from the water immiscible layer.
5. A method according to claim 4, wherein a crude isomerised extract is recovered from the water immiscible layer by evaporation.
6. A method according to claim 4, wherein the water immiscible layer is contacted with aqueous alkali at a pH sufficient to extract the iso- Alpha -acids as their alkali metal salts into an aqueous phase buT not sufficient to extract Beta -acids as their alkali metal salts into the aqueous phase.
7. A method for isomerising Alpha -acids which comprises contacting a solution consisting essentially of an Alpha -acids containing unisomerised hop extract in a mixture of a hydrocarbon solvent and a lower alcohol with a substantially stoichiometric amount of a base selected from the group consisting of the oxides, hydroxides and carbonates of calcium, magnesium, strontium, barium and zinc, to form the corresponding salt of the Alpha -acids, heating the mixture sufficiently to form the corresponding salt of the iso- Alpha -acids and recovering an isomerised hop extract from the mixture.
8. A method according to claim 7, wherein said unisomerised hop extract contains Alpha -acids, Beta -acids and hop oils.
9. A method according to claim 8, wherein the hydrocarbon solvent is present in a proportion of from 40 to 60% by weight of the total of said hydrocarbon solvent and alcohol.
10. A method according to claim 9, wherein the hydrocarbon solvent is selected from the group consisting of toluene, benzene, xylene and petroleum hydrocarbons.
11. A method according to claim 10, wherein the lower alcohol is methanol or ethanol.
12. A method according to claim 10, wherein after isomerisation sufficient water is added to the mixture to form a separate aqueous alcoholic layer and the mixture is acidified sufficiently to release free iso- Alpha -acids in the hydrocarbon solvent, and the aqueous alcoholic layer is separated.
13. A method according to claim 10, wherein the hydrocarbon solvent is removed and a crude isomerized extract is recovered.
14. A method according to claim 12, wherein the hydrocarbon solvent is contacted with an aqueous alkali at a pH sufficient to extract the iso- Alpha -acids as alkali metal salts into an aqueous phase but not sufficient to extract Beta -acids into the aqueous phase as their alkali metal salts.
15. A method according to claim 14, wherein the aqueous alkali is potassium carbonate solution.
16. A method for bittering beer which comprises adding said isomerized hop extract containing said salt of the iso- Alpha -acids recovered from said water immiscible solvent prepared in accordance with the method of claim 2, to wort within about 5 minutes prior to the termination of the wort boiling stage of brewing prior to fermentation.
17. A method for bittering beer which comprises adding crude hop extract comprising iso- Alpha -acids, Beta -acids and hop oils prepared in accordance with the method of claim 5 to wort within about 5 minutes prior to the termination of the wort boiling stage of brewing prior to fermentation.
18. A method for bittering beer which comprises adding crude hop extract comprising iso- Alpha -acids, Beta -acids and hop oils prepared in accordance with the method of claim 13 to wort within about 5 minutes prior to the termination of the wort boiling stage of brewing prior to fermentation.
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