450 µg per capsule
Rancid oil, like cod liver oil”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of rancid oil character. trans,trans-2,4-Heptadienal is an off-flavour formed in beer during ageing. Beers made with oil-rich adjuncts such as maize are particularly susceptible to development of such flavours.

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

Flavour cards

Flavour standard information

Technical specification

The best way to for tasters to detect rancid oil flavours in beer is as follows. Without covering the glass, swirl the beer to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
450 µg per capsule
The flavour threshold of 2,4-heptadienal in beer is 150 µg / l.
2,4-Heptadienal is formed in adjuncts, such as maize, during storage as a result of enzymic or non-enzymic lipid oxidation. Use of such materials can lead to development of this rancid oil flavour note in beer.
  • Not yet known
2,4-Heptadienal is an off-flavour in beer associated with ageing. Beers made with oil-rich adjuncts are most susceptible to development of this flavour.
CAS registry number
The CAS registry number for 2,4-heptadienal is 4313-03-5.
Other names
  • (2E,4E)-hepta-2,4-dienal
  • (2trans,4trans)- hepta-2,4-dienal
  • (E)-2,(E)-4-heptadien-1-al
  • (E,E)-2,4-heptadien-1-al
  • trans-2,trans-4-heptadien-1-al
  • trans,trans-2,4-heptadien-1-al
  • (E,E)-2,4- heptadienal
2,4-Heptadienal is a common fault in high adjunct pale lager beers made in warm climates. The flavour develops during the early stages of oxidation, before the appearance of papery and leathery notes.
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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rancid oil beer flavour standard - heptadienal
earn 9 points

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