Hop Extracts
| Preparation: | resins and oils of varying purity levels are extracted from hop vegetable matter and solvents are driven off |
| Major Role: | to provide hop bitterness (? aroma) to beer |
| Method of Use: | addition to boiling wort in the kettle |
COMPOSITION (% W/W)
| Component | Hops | Organic Solvent Extract | Super - Critical CO2 | Liquid CO 2 |
|---|
| Total resins | 12 - 20 | 15 - 60 | 75 - 90 | 70 - 95 |
| Alpha acids | 2 - 12 | 8 - 45 | 27 - 55 | 30 - 60 |
| Beta acids | 2 - 10 | 8 - 20 | 23 - 33 | 15 - 45 |
| Essential oils | 0.5 - 1.50 | 0 - 5 | 1 - 5 | 2 - 10 |
| Hard resins | 2 - 4 | 2 - 10 | 5 - 11 | none |
| Tannins | 4 - 10 | 0.5 - 5 | 0.1 - 5 | none |
| Waxes | 1 - 5 | 1 - 20 | 4 - 13 | 0 - 10 |
| Water | 8 - 12 | 1 - 15 | 1 - 7 | 1 - 5 |
|
ADVANTAGES |
| less bulky than either leaf hops or pellets |
| good storage stability
| | standardization gives control of bitterness |
| enhancement of utilization (33-38%) |
| reduced contamination with pesticides and nitrates |
| reduced wort losses |
| minimal packaging disposal problems |
|
DISADVANTAGES |
| modified brewing behavior compared to leaf hops |
| Solvent extracts: |
| solvent residue |
| altered aroma profile |
| presence of "impurities" |
| Supercriticial CO2 extract: |
| altered aroma profile |
| higher cost than solvent extract |
| some "impurities" |
| Liquid CO2 Extract |
| slightly lower yield |
| higher cost per unit alpha acids than other extracts |
|
|
| Source: | Moir, M.,(1988)
Developments in Hop Usage, Ferment
Vol 1, NO. 3, 49-56
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