2-methylisoborneol

Technical specification

Assessment

Earthy taints caused by 2-methylisoborneol can be best detected in the following way, Without covering the glass, swirl the sample to release the aroma. Take a single short sniff. Repeat as necessary.

Amount of flavour per capsule

260 ng per capsule

Threshold

The flavour threshold of 2-methylisoborneol in water is 85 ng / l.

Origins

Methylisoborneol (2-MIB) is formed by Actinobacteria, Cyanobacteria and algae in lakes, reservoirs and water distribution systems. It is produced both by actively-growing organisms and through cell lysis and decomposition.

Importance

Methylisoborneol imparts an unpleasant earthy odour to water which is reminiscent of peat or rotting compost. It is extremely odour-active and for that reason is one of the most common flavour faults in potable water.

CAS registry number

The CAS registry number of 2-methylisoborneol is 2371-42-8.

Other names

• 1,6,7,7-tetramethylbicyclo[2.2.1]heptan-6-ol
• MIB
• exo-1,2,7,7- tetramethyl bicyclo(2.2.1)heptan-2-ol

Remarks

Methylisoborneol is most commonly associated with surface-abstracted waters. Its formation can be influenced by weather conditions which lead to concentration of organic materials in the water and growth of microorganisms.

Threshold distribution

Capsules per pot

10