100 µg per capsule

Smoky, like smoked fish or cheese”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of smoky character. Guaiacol is an off-flavour in pale lager beer and a desirable flavour note in some speciality ales.

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

Flavour cards

Flavour standard information

Technical specification

The best way to evaluate guaiacol flavour 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
100 µg per capsule
The flavour threshold of guaiacol in beer is 33 µg / l.
Guaiacol is contributed to brewing raw materials (malt, rice etc) by intentional or non-intentional exposure to smoke. It is occasionally formed by bacteria during fermentation.

Professional tasters can confuse guaiacol in beer with the following flavours:

  • 4-Vinyl guaiacol
  • Eugenol
  • 2,6-Dichlorophenol
Guaiacol is an off-flavour in pale lager beers. It is a desirable character in some ales, in which it is imparted by speciality malts. Guaiacol is the signature flavour character of Rauchbier (smoked beer).
CAS registry number
The CAS registry number for guaiacol is 90-05-1.
Other names
  • 2-methoxyphenol
  • anastil
  • guajacol
  • guajol
  • guasol
  • 1-hydroxy-2-methoxybenzene
  • 2-hydroxyanisole
  • ortho-hydroxyanisole
  • 1-oxy-2- methoxybenzene
  • ortho- methoxyphenol
  • methyl catechol
  • ortho- methyl catechol
  • pyrocatechol methyl ester
  • pyrocatechol monomethyl ether
Guaicol is a s flavour which tends to polarize consumers – they either love it or hate it.
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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smoky beer flavour standard - guaiacol
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