isobutyraldehyde

80 µg per capsule

Grainy, like germinating malt”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of grainy character. Isobutyraldehyde and related compounds arise in beer through use of pale malts and certain brewhouse procedure. This is a key flavour impact character in some lagers and ales, an off-flavour in low alcohol beers, and a signature flavour character in some stouts.

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 grainy flavour notes in beer from isobutyraldehyde 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
80 µg per capsule
Threshold
The flavour threshold of isobutyraldehyde in beer is 10 - 25 µg / l. The precise threshold is influenced by the sulphur dioxide concentration of the beer.
Origins
Isobutyraldehyde and related compounds can arise in beer through use of pale malts and certain brewhouse procedures. Yeast strain and vigour is also important drivers of isobutyraldehyde levels..
Confusions

Professional beer tasters can confuse isobutyraldehyde with the following flavours

  • Acetaldehyde
  • trans-2-Nonenal
  • trans,trans-2,4-Heptadienal
Importance
Isobutyraldehyde is present in all beers. Concentrations vary from beer to beer. It is a key flavour impact character in some lagers and ales and an off-flavour in low and non-alcoholic beers. Isobutyraldehyde is a signature flavour character in some stouts.
CAS registry number
The CAS registry number of isobutyraldehyde is 78-84-2.
Other names
  • 2-methylpropanal
  • isobutanal
  • isobutyl aldehyde
  • isobutyral
  • isobutyric aldehyde
  • 2-methyl propanal
  • 2-methyl propionaldehyde
  • alpha-methyl propionaldehyde
  • 2-methyl-1-propanal
  • 2-methylpropanal
  • isopropyl aldehyde
  • valine aldehyde
Remarks
Several compounds, closely related to isobutyraldehyde also impart grainy notes to beer. The flavour impact of such aldehydes is influenced by the sulphur dioxide concentration of the beer.
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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Grainy beer flavour standard - isobutylquinoline
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