Determination and elimination of rotten grape aroma by filter layers with selective adsorbers

Abstract

Abstract. The most important mould associated substances like geosmine, 2-methylisoborneol, 1-octen-3-ol in wines of different grape varieties from Austria and also from other foreign countries were analysed by a HS-SPME GC-MS method. These substances were also determined in healthy and rotten grapes. All together, 391 wine-samples and 69 grape samples were examined. The study of rotten and healthy grapes found out a level of geosmin up to 20 ng/L, 1-octene-3-ol concentration up to 700 µg/L and 2-heptanol level up to 9 µg/L. The geosmin concentration of the 391 analyzed wines extended from 1-44 ng/L. The detected level of 1-octene-3-ol ranged from 1 µg/L to 23 µg/L. The determined concentration of 2-heptanol ranged from 1 µg/L up to 38 µg/L. The test with the filter layer Fibrafix TX-R was performed with nine layersá 20 × 20 cm (3.6 m 2 ) and a quantity of 625 liters wine. The filtering achieved a significant reduction of the start concentration of 60 ng/L geosmin down to only 6 ng/L (average value of 600l).