Iso-Extract 30% is an aqueous solution of the potassium salts of iso-alpha acids. ISO 30% can be used post fermentation to top-up bitterness or to partially replace traditional forms of bittering. ISO 30% is added immediately before filtration for best yield results.

Usage
Iso-Extract is typically used for the post fermentation adjustment of beer bitterness.

Dosage
Dosage of Iso-Extract (typically 30 %) is based on the concentration of the Iso-Extract, the expected utilization and the desired intensity of bitterness in the beer.

Application
Iso-Extract is added at full strength (undiluted) prior to filtration. If dilution is necessary, always add Iso-Extract to demineralized water first and adjust the pH to 8.5 – 9.5 using either potassium hydroxide (KOH) or potassium carbonate (K2CO3). Laboratory scale testing is recommended prior to commercial use. Never dilute full-strength Iso-Extract with beer, as the lower pH will cause precipitation. Suitable dosing equipment should be used to add Iso-Extract into the beer stream at a point where vigorous mixing is assured during beer transfer. If containers are used over several days, it is recommended that the headspace be flushed with nitrogen (CO2 is not suitable).