2-Methylisoborneol

2-Methylisoborneol (2-MIB) is a organic terpene that is a significant contributor to the taste and odor of certain freshwater sources. It is produced by several classes of microorganisms, including cyanobacteria and actinobacteria, and is often responsible for off-flavors in drinking water and certain food products.

Chemistry

2-Methylisoborneol is a monoterpene and a volatile organic compound, meaning it readily evaporates at room temperature. Its chemical formula is C₁₁H₂₀O, and its molecular weight is 168.27 g/mol. It is a cyclic compound, with a structure that includes a six-membered ring and a methyl group.

Production and occurrence

2-Methylisoborneol is produced by several types of microorganisms, including certain species of cyanobacteria and actinobacteria. These organisms produce 2-MIB as a secondary metabolite, often in response to environmental stressors such as changes in temperature, light, or nutrient availability.

In the environment, 2-MIB is often found in freshwater sources, including reservoirs, lakes, and rivers. It can also be found in certain food products, particularly fish and shellfish that have been exposed to contaminated water.

Impact on water quality

The presence of 2-MIB in drinking water is a common cause of off-flavors, often described as "earthy" or "musty". These flavors are not harmful to health, but they can be unpleasant and can lead to complaints from consumers.

Water treatment processes can remove 2-MIB from water, but this can be challenging due to the compound's low solubility and high vapor pressure. Common methods include activated carbon filtration, ozonation, and biological filtration.

See also

• Geosmin
• Taste and odor in drinking water
• Water treatment

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