15 mg per capsule

Acetaldehyde, like emulsion paint or green apples”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of acetaldehyde character. Acetaldehyde is produced by yeast during fermentation. A positive note at low levels but an off-flavour at higher levels. It is indicative of fermentation problems or poor control of dissolved oxygen in packaging.

Food grade | free from sensory impurities | extensively tested | safe to smell and taste.

Flavour cards

Flavour standard information

Technical specification

The best way to detect acetaldehyde flavours notes in beer is as follows. Cover the beer with your hand and swirl the glass to release the aroma. Remove your hand and take a single long sniff. Repeat as necessary.
Amount of flavour per capsule
15 mg per capsule
The flavour threshold of acetaldehyde in beer is 5 mg / l. The presence of sulphur dioxide increases the flavour threshold of acetaldehyde.
Acetaldehyde is reduced by yeast during fermentation as the penultimate step in production of ethanol from wort sugars. Its presence is indicative of fermentation problems and poor control of dissolved oxygen in packaging.

Tasters can confuse acetaldehyde with the following flavours in beer

  • Ethyl hexanoate
  • 2,4,6-Trichloroanisole
  • cis-3-Hexenol
Acetaldehyde is present in all beers. It is a characteristic flavour of some beer styles, eg Bière de Garde. Acetaldehyde is an off-flavour at high concentrations in beer.
CAS registry number
The CAS registry number of acetaldehyde is 75-07-0.
Other names
  • acetic aldehyde
  • ethanal
  • ethyl aldehyde
  • acetaldehyd
  • aldehyde acetique
  • aldeide acetica
  • octowy aldehyd
The flavour impact of acetaldehyde is influenced by the sulphur dioxide concentration in the beer.
Threshold distribution
Capsules per pot
Legal notices
This product is protected by the following trade marks and patents:
  • US Patent no. D679900
  • European Community Trade Mark
    Registration no. 009937574
  • European Community Trade Mark
    Registration no. 009856527
  • US Trade Mark Registration no. 4345057
  • US Trade Mark Registration no. 4345056
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beer flavour standard - acetaldehyde
earn 10 points

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