methyl thioacetate

267 µg per capsule

Cooked vegetable, like boiled cauliflower”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of cooked vegetable character. Methyl thioacetate is produced by lager yeast, but not by ale yeast, during fermentation. It is a positive flavour character in lager beer but an off-flavour in other beer styles.

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

Flavour cards

Flavour standard information

Technical specification

The best way to detect cooked vegetable notes in beer associated with methyl thioacetate is as follows. Cover the beer with your hand and swirl the glass to release the aroma. Remove your hand and take a single long sniff. Repeat as necessary.
Amount of flavour per capsule
267 µg per capsule
The flavour threshold of methyl thioacetate in beer is 85 µg / l.
Methyl thioacetate is produced by lager yeast (but not by ale yeast) during fermentation. The amount produced depends on wort composition, yeast strain and fermentation conditions.

Professional beer tasters sometimes confuse methyl thioacetate with the following flavour compounds:

  • Dimethyl sulphide
  • Dimethyl trisulphide
  • Dimethyl disulphide
Methyl thioacetate is a positive sulphury flavour note in some lagers. It can be perceived as an off-flavour in other lagers and in all ales and stouts.
CAS registry number
The CAS registry number of methyl thioacetate is 1534-08-3.
Other names
  • S-methyl ethanethioate
  • ethane thioic acid S-methyl ester
  • methane thiol acetate
  • S-methyl acetothioate
  • S-methyl ethane thioate
  • S- methyl ethanethioate
  • 1-methyl sulfanyl ethanone
  • (methyl thio) acetate
  • S-methyl thioacetate
As a sulphur ester, production of methyl thioacetate by yeast closely parallels that of other esters such as ethyl acetate.
Threshold distribution
Capsules per pot
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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Cooked vegetable beer flavour standard - methyl thioacetate
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