UC18 Sigma-Aldrich


≥97% (GC)

Synonym: 2β,6α-Dimethylbicyclo[4.4.0]decan-1β-ol




5, 10 mg in glass bottle


(±)-Geosmin has been used as a standard for GC-MS based analytical techniques. Geosmin has also been used to study its adsorption on activated carbon.

Biochem/physiol Actions

Geosmin is a naturally occurring biomolecule that contributes to the earthy or musty flavor and odor in water supplies. This water contaminant can be detected by humans at ng/l (parts per trillion) concentrations.

Safety & Documentation

Safety Information

GHS07  GHS07
Signal word 
Hazard statements 
Precautionary statements 
Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
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What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
What can you tell me about the stereochemistry of Sigma-Aldrich's (±)-Geosmin products?
The geosmin products listed by Sigma-Aldrich (CAS Registry number [16423-19-1]) are synthetic, and would be exactly a 50:50 mixture of the (+) and (-) isomers. Specifically, the natural (-) isomer is (4S,4aS,8aR)-4,8a-Dimethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-4a-ol. Therefore, the unnatural (+) isomer (the mirror image) is (4R,4aR,8aS)-4,8a-Dimethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-4a-ol.This information has not been confirmed by a specific rotation measurement or chiral analysis, but is known based on the method of preparation.
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