Method of purifying iso-.alpha.-acids

Details Method of purifying iso-.alpha.-acids Method of purifying iso-.alpha.-acids

1980-05-21

1982-08-03

Yudkoff, Norman

Food or edible material: processes, compositions, and products

Products per se, or processes of preparing or treating...

Hop derived ingredient, including hopping of wort

426651, 426 16, C12C 300

Patent

active

043427910

ABSTRACT:
A method of purifying aqueous solutions of iso-.alpha.-acids by removing .beta.-acids therefrom comprises first bringing the solution to an iso-.alpha.-acid concentration of 0.5% to 10% .sup.w /w, particularly 0.5% to 5% .sup.w /w, then reducing the pH to a value in the range 7 to 10, preferably 8 to 9, so as to form an easily filtered precipitate of .beta.-acids. Preferably pH reduction is effected by bubbling carbon dioxide through the solution. The separated iso-.alpha.-acid solution may be concentrated to an extent that a phase separation takes place into two aqueous phases one of which has a higher iso-.alpha.-acid concentration than the other. The recovered iso-.alpha.-acid solution is suitable for direct addition to beer without haze formation.

REFERENCES:
patent: 2816032 (1957-12-01), Meyer
patent: 3451821 (1969-06-01), Todd
patent: 3532504 (1970-10-01), Flesch
patent: 3751266 (1973-08-01), Kuroiwa
patent: 3787499 (1974-01-01), Grant
patent: 3949092 (1976-04-01), Mitchell
patent: 4212895 (1980-07-01), Laws

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