Naturally occurring alcohol with pronounced earthy-musty odor and taste, It is perceived as a typical soil odor, causing, inter alia, the smell of molds and occurs after a prolonged rainfall dryness or on freshly plowed soil. Geosmin is from microorganisms bstimmter bacteria (Myxobacteria and Streptomyces species) that live mainly in the soil. (pictured fruiting body of myxobacteria).
Geosmin is also responsible for the typical smell of beets. In the wine is one earthy Low-grade clay is considered positive and often the characteristic of certain French red wines (see below) Stinkerl ). If stronger, this indicates wine faults as Geranienton. corked or horse sweat out. The human sense of smell reacts highly sensitively to geosmin; the Perceptual threshold is 0.1 ppb,