Humulinone Utilization In Dry-Hopped Beers

Humulinones are similar in structure and about 65 % as bitter as iso-alpha acids – see Newsletter

2015 - 04. Humulinones are found in leaf hops and hop pellets at concentrations of

0.2 %-0.5 % w/w. We measured the humulinone concentration of beer that had 100 % of the

hop dosage added to the kettle. Beers that were heavily hopped can contain as much as 4 ppm

of humulinones in the final beer, with typical Lagers containing 1 ppm or less. However, when we

measured the humulinone concentration of beers that were dry-hopped, as much as 24 ppm of

humulinones were measured in the beers.

To determine the solubility of humulinones in beer hop pellets of the variety Centennial containing

0.35 % w/w humulinone were added to a low and high IBU beer at the dosage levels indicated

in the table below for three days. Our tests showed that 87-98 % of the humulinones from

Centennial hop pellets dissolve into the beers, regardless of IBU, indicating that humulinones are

extremely soluble in beer.

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