Abstract
Cereal-based distilling washes show alcohol yield variation due to differences in starch conversion, fermentable sugar release, yeast nutrition, temperature control, and fermentation completeness. This study evaluates alcohol yield variation in cereal-based distilling washes under controlled fermentation. Washes were prepared from selected cereal substrates using standardized milling, enzymatic conversion, mashing, and fermentation conditions. Fermentable sugar composition, free amino nitrogen, wort viscosity, yeast growth, ethanol concentration, residual extract, pH, organic acids, higher alcohols, and fermentation duration were measured. The results show that complete starch conversion and balanced nitrogen availability produced higher and more stable alcohol yields. Incomplete cereal conversion increased residual sugars and reduced ethanol recovery, while temperature instability increased by-product formation and yield variability. Proper enzyme treatment improved sugar release and fermentation consistency across cereal types. The study demonstrates that alcohol yield in distilling washes depends on coordinated control of raw material conversion, yeast performance, and fermentation environment.