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4-ethyl phenol

Band aid

BEER

£55.00£85.00


 

Quantity

Product Description

Phenolic-4-EP, like blue cheese or band-aid”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of phenolic character.

4-Ethyl phenol is produced by contaminant Brettanomyces yeasts and sometimes by lactic acid bacteria. This compound imparts an unpleasant ‘band-aid’ note to beer, occasionally described as ‘horse-like’ or ‘barnyard’. At low levels 4-ethyl phenol contributes to product complexity.

Food grade | Free from sensory impurities | Extensively tested | Safe to smell and taste.

IMPORTANCE

Since conventional brewer’s yeast (Saccharomyces) does not produce 4-ethyl phenol, its presence in most beers indicates microbiological contamination.

ORIGINS

4-Ethyl phenol is produced by contaminant Brettanomyces (Dekkera) yeasts and, occasionally by lactic acid bacteria, during beer production. Beers which are low in sulphur dioxide are particularly sensitive to growth of such microorganisms. Produced by Brettanomyces yeasts during or after fermentation. In most beers, Brettanomyces is a contaminant. 4-Ethyl phenol is an off-flavour in such beers. Some beers styles rely on flavours produced by Brettanomyces for their distinctive character.

HOW TO TASTE

The best way to evaluate band aid, horsey flavour notes caused by growth of Brettanomyces in beer is as follows. Cover the sample with your hand and swirl the glass to release the aroma. Remove your hand and take a single long sniff. Repeat as necessary.

CAS NUMBER

The CAS registry number of 4-ethyl phenol is 123-07-9.

Additional Information

Weight 0.06 kg
Dimensions 0.85 × 0.85 × 0.35 cm
process

fermentation-maturation, ingredients, processing

flavour

microbiological spoilage, off-flavour

chemical

phenolics

capsules per pot

10 capsules, 6 capsules

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