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Isomerized Hop Extracts

Preparation:	alpha acids are separated as alkali metal salts from whole resin extract, isomerized and taken up in buffered water
Major Role:	provision of hop bitterness in whole or in part to beer
Method of Use:	used on post-fermentation basis by metered injection into beer lines

COMPOSITION Alpha acids (HPLC) 0 - 0.8% Beta acids 0 - 0.3% Fats and waxes 0 - 0.3% Aroma absent Bitter units (iso-alpha) 29 - 31% (w/v) Potassium carbonate buffered water 68 - 70% SPECIFICATIONS pH (1% soln.) 9.0 - 9.5 Haze (1% soln.) 0 - 5 (EBC) Gushing test Nil

ADVANTAGES - very easy to handle, ship, store and use - totally consistent and standardized - product with highest utilization rate (65-70%) - provides for very easy adjustment of bitterness - allows production of beers with varying bitterness from a single base beer - almost totally inert in aroma terms (non-variety specific) DISADVANTAGES - too costly as exclusive source of bitterness - brewer must still consider sources of hop aroma and flavour - "chemically processed" product - reputed association with gushing - now shown to be false