280 ng per capsule
Geosmin, like sugar beets or damp soil”

Certified wine flavour standard used to train professional tasters to recognize and scale the intensity of geosmin character. Geosmin - a flavour associated with some types of cork taint - imparts an undesireable earthy / mouldy note to wine, reminiscent of sugar beets or damp soil. It can be imparted to wine through use of grapes which have been affected by grey rot. Use of dirty barrels or corks can also be responsible for this taint.

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 geosmin in wine is as follows. Without covering the glass, swirl the sample to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
280 ng per capsule
The flavour threshold of geosmin in wine is 10 - 20 ng / l.
Geosmin is imparted to wine through use of grapes affected by gray rot, caused by growth of both Botyrtis cinerea and Penicillium spp. Dirty filter pads and use of contaminated barrels and corks can also give rise to this taint.
Geosmin imparts an undesirable earthy / muddy note to wine which is reminiscent of sugar beets or damp soil. Associated with a moderate degree of consumer rejection. It is often described by consumers as ‘dirty’ or ‘contaminated’. Geosmin is responsible for some types of cork taint.
CAS registry number
The CAS registry number for 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
Control of geosmin problems requires adequate preventative measures to be in place to prevent growth of undesirable microorganisms both on the vines and in the winery. Geosmin breaks down in wine over time, so problems with this flavour are usually confined to young wines.
Threshold distribution
Capsules per pot
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