2-methylisoborneol

260 ng

“Earthy, mouldy, like peat or compost”

Beer flavour standard used to train professional beer tasters to recognize and scale the intensity of earthy character. 2-Methylisoborneol is imparted to beer via tainted water. It gives affected beers an earthy, somewhat mouldy character reminiscent of peat or rotting compost.

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

  • Label image
  • Chemical structure

Flavour cards

Flavour standard information

Technical specification

Assessment
Without covering the glass, swirl the beer to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
260 ng
Threshold
85 ng / l in beer
Origins
Imparted through use of contaminated brewing liquor, rinse liquor or dilution liquor. Source of the taint is growth of microorganisms in the water supply.
Confusions
  • Geosmin
  • Ethyl fenchol
  • 2-Isopropyl-3-methoxypyrazine
Importance
Taint in beer. Associated with a moderate degree of consumer rejection. Often described by consumers as ‘dirty’ or ‘contaminated’.
CAS registry number
2371-42-8
Other names
  • 1,6,7,7-tetramethylbicyclo[2.2.1]heptan-6-ol
  • MIB
  • exo-1,2,7,7- tetramethyl bicyclo(2.2.1)heptan-2-ol
Remarks
This is a problem usually associated with abstraction of surface waters. Water treatment practices should remove the methylisoborneol prior to use.
Threshold distribution
Graph
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Methylisoborneol beer flavour standard
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