isoamyl acetate

3.5 mg per capsule

Isoamyl acetate, like bananas or pear drops”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of isoamyl acetate character. Isoamyl acetate is produced by both ale and lager yeasts during fermentation. It is a key impact character in some lagers and ales and a signature flavour character in German-style wheat beers.

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 isoamyl acetate flavour in beer is to swirl the beer, covering the glass with your hand to release the aroma, before taking a single long sniff. You can also evaluate the flavour retronasally.
Amount of flavour per capsule
3.5 mg per capsule
Threshold
The flavour threshold of isoamyl acetate in beer is 1.1 mg / l.
Origins
Isoamyl acetate is produced by both ale and lager yeast during fermentation. The amount of isoamyl acetate produced depends on wort composition, yeast strain and fermentation conditions.
Confusions

Isoamyl acetate is sometimes confused with the following flavours in beer:

  • Ethyl hexanoate
  • Ethyl acetate
  • Ethyl butyrate
Importance
Isoamyl acetate is present in all beers. Concentrations vary considerably from beer to beer. It is a key flavour impact character in some lagers and ales and a signature flavour character in German-style wheat beer.
CAS registry number
The CAS registry number for isoamyl acetate is 123-92-2
Other names
Alternative names for isoamyl acetate include:
  • 3-methylbutyl acetate
  • acetic acid 3-methyl butyl ester
  • acetic acid isopentyl ester
  • isoamyl ethanoate
  • 3-methyl butyl acetate
  • beta-methyl butyl acetate
  • 2-methyl butyl ethanoate
  • 3-methyl butyl ethanoate
  • 3-methyl-1-butanol acetate
  • 3-methyl-1-butyl acetate
  • 3-methylbutyl acetate
  • isopentyl acetate
  • isopentyl alcohol acetate
  • isopentyl ethanoate
Remarks
Isoamyl acetate disappears during ageing of beer in pack, contributing to a loss of freshness.
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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capsule for isoamyl acetate beer flavour standard
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