730 ng per capsule

Papery, like cardboard or oxidized beer”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of papery character. trans-2-Nonenal is an off-flavour associated with beer ageing. It is one of several compounds formed as a result of oxidation reactions which occur in the malting and brewing processes.

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 trans-2-nonenal 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
730 ng per capsule
The flavour threshold of trans-2-nonenal in beer is 50 – 250 ng / l.
Nonenal is formed during malt and wort production. After being formed, it binds to malt proteins. It is carried through the brewing process in this bound form before being released during storage of finished beer in bottles, cans or kegs.

Nonenal is sometimes confused wth:

  • 2,4,6-Trichloroanisole
  • 2-Ethyl fenchol
  • Isobutyraldehyde
Nonenal is an off-flavour in beer associated with ageing. Formation of this flavour is more pronounced when precautions have not been taken in relation to minimizing process oxidation.
CAS registry number
The CAS registry number for nonenal is 18829-56-6.
Other names
  • (E)-heptylidene acetaldehyde
  • (E)-3-hexyl acrolein
  • (E)-3-hexyl-2-propenal
  • (E)- non-2-enal
  • trans-non-2-enal
  • (E)-2-nonen-1-al
  • trans-2-nonen-1-al
  • (E)-2- nonenal
  • trans-2- nonenal
Sulphur dioxide in beer reversibly reacts with trans-2-nonenal to reduce its flavour impact.
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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Capsule for papery beer flavour standard
earn 9 points

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