TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method for reducing the concentration of sulfur and/or sulfur-containing compound in a compound is prepared by fermentation. The method is carried out in the absence of hydrogen. The respective organic compound is brought into contact with the doped alumina in the liquid phase. Preferred Components: The clay is a mineral from the serpentine-kaolin, talc-pyrophyllite, smectite, vermiculite, illite, mica, brittle mica, chlorite and/or sepiolite-palygorskite group. The clay comprises a kaolinite, illite, illenite, pyrophyllite, celadonite, beidellite, nontrionite, hectorite, saponite, vermiculite, clinochlore, sheridanite, sudoite, cookeite, danobassite, rectorite, tosudite, corrensite, sepiolite, loughlinite, palygorskite, montmorillonite, bentonite, smectite, chlorite, glauconite, muscovite, vermiculite, and/or talc. The clay is doped with such an amount of silver (Ag) and/or silver compound that a content in the range of 0.1-20 wt.%, calculated as Ag, is obtained. The silver compound is a silver(I) salt (preferably silver oxide (Ag2O), silver carbonate (Ag2CO3), silver nitrate (AgNO3), silver sulfate (Ag2SO4), silver halide (AgI, AgBr, AgCl, AgF) or silver sulfide (Ag2S)).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The biochemically prepared organic compound is an alcohol, ether or carboxylic acid (preferably methanol, ethanol, 1,3-propanediol, 1,4-butanediol, 1-butanol, glycerol, tetrahydrofuran, furfural, lactic acid, succinic acid, malonic acid, citric acid, acetic acid, propionic acid, 3-hydroxypropionic acid, butyric acid, formic acid or gluconic acid), where the alcohol is a 1-5C alcohol having a boiling point of less than or equal to 290 degrees C/1 bar (absolute pressure). The biochemically prepared compound comprises water (0-50 wt.%). The ethanol comprises a denaturant. The biochemically prepared organic compound is brought into contact with the doped alumina at a temperature of 10-200 degrees C and at absolute pressure of 1-200 bar. EXAMPLE - No suitable example given.