Onion Beer Flavour Standard

Onion (dimethyl trisulphide)

Onion or dimethyl trisulphide (DMTS) is perceived as a cooked onion or garlic like flavour that occurs in beer. It is a normal part of the profile of beer but at high levels can be seen to be an off flavour. DMTS is produced from several sources in beer – from sulphur containing amino acids during wort boiling, found in hop oil and is generated by the oxidization of methanthiol. It is one of a number of sulphur flavours and off notes that can occur in beer. DMTS is normally purged during fermentation by yeast derived carbon dioxide.

Dimethyl trisulphide can also form a septic like flavour when in the presence of indole. We recommend that our Onion Beer Flavour Standard is used as part of an overall sulphur awareness training strategy for advanced sensory panels, or if your beer commonly encounters onion / garlic like flavours.

Our Onion Beer Flavour Standards are available in blister packs of 5 capsules.

To train with this flavour swirl the sample glass to release the aroma and take short sniffs while near the nose.


Standard recommended by Peppard (J Inst Brew, 91, 364-369).

GMP Flavour Standards

FlavorActiV’s GMP Flavour Standards use the pharmaceutical industry’s quality standards known as GMP – the ultimate in human consumption quality levels. All of our GMP Flavour Standards are manufactured in our dedicated GMP Flavour Centre located in the UK. Our GMP Flavour Centre was purpose built from the ground up to produce Flavour Standards of the highest quality levels. Our GMP Flavour Centre is the only one of its kind in the world and produces flavour standard material for use globally. Only GMP Flavour Standards provide sufficient quality for professional sensory panels to train and validate with. Learn more here.

Associated terms

  • Cooked onion
  • Garlic like


  • Gas Chromatography

Typical concentration in beer

  • 0.05 - 0.3 µg/l

Approximate flavour threshold

  • 0.1 µg/l

Beer flavour wheel number

  • 0736
BFS Promo Onion

BFS Promo Onion

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