100 ng per capsule

Lightstruck, like a skunk or freshly-brewed coffee”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of lightstruck character. 3-Methyl-2-butene-1-thiol is an off-flavour formed in beer when it is exposed to light.

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

Flavour cards

Flavour standard information

Technical specification

Lightstruck flavour is best detected by smelling the beer at a distance. Hold the glass at arm’s length and take short sniffs to prevent the risk of adaptation.
Amount of flavour per capsule
100 ng per capsule
The flavour threshold of MBT is 4 – 30 ng / l in beer.
3-Methyl-3-butene-1-thiol is formed in beer as a result of exposure to daylight or artificial light. This initiates a reaction involving hop bitter acids, vitamins and sulphur compounds. Small amounts are also formed in beer production.

MBT is sometimes confused with the following flavours in beer

  • Sulphur dioxide
  • cis-3-Hexenol
  • Ethanethiol
Lightstruck character is an off-flavour associated with exposure to light of beer packaged in clear or green glass. Consumers are very tolerant of this off-flavour. Many successful beers contain MBT at the point of consumption.
CAS registry number
The CAS registry number for MBT is 5287-45-6.
Other names
  • lightstruck
  • sunstruck
  • prenyl mercaptan
  • 3-methyl but-2-ene-1-thiol
  • methyl butene thiol
  • 3-methyl-2-butene-1-thiol
  • 3-methyl-2-butenyl mercaptan
  • 3-methylbut-2-ene-1-thiol
  • prenyl thiol
Beers which have been bittered with chemically-modified hop extracts do not develop lightstruck flavour character.
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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Capsule for lightstruck beer flavour standard
earn 10 points

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