70 ng per capsule

Geosmin, like sugar beets or damp soil”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of geosmin character. Geosmin is one of several compounds that impart an earthy note to beer. The flavour arises as a taint due to contamination of water.

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 earthy flavours from geosmin 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
70 ng per capsule
The flavour threshold of geosmin in beer is 20 ng / l.
Geosmin is imparted through use of contaminated brewing liquor, rinse liquor or dilution liquor. The source of the taint is usually growth of microorganisms in the water supply.

Professional beer tasters can confuse the odour and flavour of geosmin with the following flavours

  • 2-Methylisoborneol
  • Ethyl fenchol
  • 2-Isopropyl-3-methoxypyrazine
Geosmin is a taint in beer. It is associated with a moderate degree of consumer rejection. Geosmin is described by consumers as ‘dirty’ or ‘contaminated’.
CAS registry number
The CAS registry number of geosmin is 23333-91-7.
Other names
  • 2beta,6alpha-dimethyl bicyclo(4.4.0)decan-1beta-ol
  • octahydro-4,8a-dimethyl-4a(2H)-naphthol
  • 2b,6a-dimethyl bicyclo[4.4.0]decan-1b-ol
  • 2beta,6alpha-dimethyl bicyclo[4.4.0]decan-1beta-ol
  • 1,10-(E)-dimethyl-(E)-(9)-decalol
  • (E)-1,10-dimethyl-(E)-decalin-9-ol
  • 2b,6a-dimethyl bicyclo(4.4.0)decan-1b-ol
  • 2,6-dimethyl bicyclo(
  • 4,8a-dimethyl decalin-4a-ol
  • 4,8a-dimethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-4a-ol
  • octahydro-4,8a-dimethyl-4a(2H)-naphthalenol
  • octahydrodimethyl-4alpha-naphthol
Geosmin is a problem usually associated with abstraction of surface waters. Water treatment practices should remove any geosmin present prior to use.
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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geosmin beer flavour standard
earn 9 points

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