2-isobutyl-3-methoxypyrazine

60 ng per capsule

Earthy, like green pepper”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of earthy character. 2-Isobutyl-3-methoxypyrazine contaminates beer via tainted water. This compound has an odour which is reminiscent of green peppers or green beans.

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

Flavour cards

Flavour standard information

Technical specification

Assessment
The best way to detect earthy taints from 2-isobutyl-3-methoxypyrazine 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
60 ng per capsule
Threshold
The flavour threshold of 2-isobutyl-3-methoxypyrazine in beer is 20 ng / l.
Origins
2-Isobutyl-3-methoxypyrazine is imparted to beer through use of contaminated brewing liquor, rinse liquor or dilution liquor. The source of the taint is growth of microorganisms in the water supply.
Confusions
  • Not yet known
Importance
2-Isobutyl-3-methoxypyrazine imparts an earthy taint to beer. It is associated with a high degree of consumer rejection. Beers contaminated with 2-isobutyl-3-methoxypyrazine described by consumers as ‘chemical’ ’ or ‘contaminated’.
CAS registry number
The CAS registry number of 2-isobutyl-3-methoxypyrazine is 24683-00-9.
Other names
  • 2-methoxy-3-(2-methylpropyl)pyrazine
  • isobutyl methoxypyrazine
  • 3-isobutyl-2-methoxypyrazine
  • galbanum pyrazine
  • 2- methoxy-3-(2-methyl propyl) pyrazine
  • 2-methoxy-3-(2-methylpropyl)pyrazine
  • 2-methoxy-3-isobutyl pyrazine
  • 2-2-methyl propyl-3-methoxypyrazine
Remarks
Methoxypyrazine taints can be caused by several compounds, of which 2-isobutyl-3-methoxypyrazine is only one. Water treatment practices should remove the methoxypyrazine prior to use.
Threshold distribution
Graph
Capsules per pot
10
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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isobutyl methoxypyrazine beer flavour standard - earthy
earn 9 points
£89.00

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