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Sensory properties and analysis of 2 muddy odor compounds geosmin and 2 methyl iso borneol in water and fish


, : Sensory properties and analysis of 2 muddy odor compounds geosmin and 2 methyl iso borneol in water and fish. Water Research 14(8): 1113-1118

Muddy or earthy odors are a problem in water supplies and fisheries. Some aquatic actinomycetes and blue-green algae are generally indicated as sources of muddy odor in natural waters. These organisms produce the muddy-smelling compounds geosmin and 2-methylisoborneol. The sensory properties of geosmin and 2-methylisoborneol in water and in the flesh of 4 spp. of fish were studied. Threshold odor concentrations are presented and they indicate that both compounds have strong odor characteristics. The intensity of the muddy odor as perceived by the judges was proportional to the log of the concentration of muddy odor compounds in the concentration ranges tested (for geosmin, up to 100 .mu.g kg-1, and for 2-methylisoborneol, up to 10 .mu.g kg-1). It may be possible to quantify muddy odor compounds in water and fish by sensory methods.

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