2-isopropyl-3-methoxypyrazine

6.0 ng

“Earthy, like potato skins or dug soil”

Soft drinks flavour standard used to train professional tasters to recognize and scale the intensity of earthy character. 2-Isopropyl-3-methoxypyrazine is a potent off-flavour with a very low flavour threshold. It is introduced to soft drinks through contaminated formulation water or process water. It imparts an earthy note, reminscent of potato skins or dug soil.

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 sample to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
6.0 ng
Threshold
2 ng / l in soft drinks
Origins
Introduced through use of contaminated formulation water or process water. Formed by Actinobacteria in lakes, reservoirs and water distribution systems.
Importance
Potent off-flavour with a very low flavour threshold. Imparts an unpleasant earthy / mouldy note which is reminiscent of potato skins or dug soil. May occur in admixture with other methoxypyrazines.
CAS registry number
25773-40-4
Other names
  • bean pyrazine
  • 2-methoxy-3-(1-methyl ethyl) pyrazine
  • 2-methoxy-3-isopropyl pyrazine
  • 2-methoxy-3-propan-2-ylpyrazine
  • 2-isopropyl-3-methoxypyrazine
  • 3-isopropyl-2-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
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