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The bitterness of beer is measured according to the International Bitterness Units scale, with one IBU corresponding to one part-per-million of isohumulone. When beer is exposed to light, these compounds can decompose in a reaction catalyzed by riboflavin to generate free-radical species by the homolytic cleavage of the exocyclic carbon-carbon bond.
For example, an imperial stout may have an IBU of 50, but will taste less bitter than a pale lager with an IBU of 30, because the pale lager has a lower flavour intensity. After around 100 IBU, hop utilization is so poor that the number ceases to be meaningful in regard to taste, although continued hop additions will increase bitterness.
Isohumulone (an iso-alpha acid responsible for the bitter taste of hops) and its combinations with Ni, or Fe, also favor gushing, while pure Co ions or their combination with isohumulone do not exhibit gushing and overfoaming. This explains why cobalt salts were specifically selected at a concentration of 1 – 2 mg/L as anti-gushing agent for ...
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In England the bottled counterpart of basic bitter; in Scotland, "Light" is the lowest gravity draught beer (normally dark in colour). [4] Session or ordinary bitter Strength up to 4.1% abv. This is the most common strength of bitter sold in British pubs. It accounted for 16.9% of pub sales in 2003. [5] Best or special bitter
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Bière de Garde is a hybrid beer whose name translates from French to English as “Beer for Keeping”. The ale is low to moderate in esters and contains a similar malt sweetness to most other ales. The ale's ABV ranges from 4.4% to 8% and has a range of appearances, with its primary descriptions being “Light Amber, Chestnut Brown, or Red.”
A combination of human instinct, DNA and learned behavior determines whether you love or loathe hoppy brews.