Isomerized hop extract (Iso-Extract)
Do not boil.
Can be added after fermentation.
Iso-alpha acids: 6%;
1 ml added to 10 litres of beer increases the bitterness by 6 IBU.
Isomerized hop extract is a pale, yellow to amber aqueous, alkaline solution of the potassium salt of iso-alpha-acids.
It is produced from a CO2 extract of hops and contains only purified isomerized alpha-acids.
It can be used to top-up bitterness or used as a partial hop replacement (up to 70% of the total bitterness).
It is added post fermentation, greatly improving the utilization of iso alpha-acids into beer and therefore is the cheapest form of bittering.