Hop extract process and product
US3965188A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1974 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | Jan 3, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12C11/11
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
Hop extract in, e.g., hexane, pre-isomerized, optionally pre-reduced, is extracted with aqueous KOH to give potassium isohumulate of 80%+ and preferably 90%+ purity. The hexane phase containing the remainder of the isohumulones is stripped of solvent and is suitable for kettle addition. In order to prevent foaming during subsequent concentration, the aqueous extract containing about 6% solids is acidified to a pH less than the pK.sub.a of isohumulone and is concentrated under reduced pressure. After concentration, the material is treated with KOH to form the water soluble isohumulone salt which is added to beer post-kettle. At a critical optimum pH range, dependent upon the ratio of water to hexane phase used in the initial extraction, from 0.1 to 0.75 of the isohumulones may be extracted in the highly purified form. A generalized technique for establishing conditions that will give such desired fractions and residues is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.