C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/582.4
C07C 45/85 (2006.01) C07C 49/743 (2006.01) C12C 3/10 (2006.01)
Patent
CA 1097688
ABSTRACT OF THE DISCLOSURE A method of providing a high quality iso-.alpha.-acid preparation is described. The method involves extracting a high quality primary extract containing .alpha.-acids from hops using liquid CO2 and isomerizing the .alpha.-acids in the primary extract. The liquid CO2 extraction is performed at a sub-critical temperature of not less than -5°C. The primary extract contains .alpha.-acids, .beta.-acids, hop oil and usually no significant amounts of other organic compounds originating from the hops. In the preferred method the primary extract is not purified and the isomerization is performed by boiling an alkaline solution of the extract. This boiling can be utilized to remove the hop oil. The .beta.-acids can be readily removed by acidifying the solutionof iso-.alpha.-acid and filtering off the precipitated .beta.-acids. The iso-.alpha.-acid preparation is of outstanding purity and can be added to beer after fermen- tation and in particular to bright beer after final filtration to provide bitterness.
288549
Bath Nigel A.
Ennis Colin S.
Laws Derek R. J.
Pickett John A.
Wheldon Alfred G.
Brewing Patents Limited
Fetherstonhaugh & Co.
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