Abstract
Industrial-scale ale fermentation differs from laboratory fermentation because vessel geometry, hydrostatic pressure, cooling efficiency, yeast mixing, and heat removal influence volatile ester development. This study examines volatile ester formation during industrial-scale ale fermentation. Production-scale fermentations were monitored under controlled wort composition, pitching rate, oxygenation, and temperature profiles. Isoamyl acetate, ethyl acetate, ethyl hexanoate, higher alcohols, ethanol formation, attenuation, yeast viability, pH reduction, and sensory aroma intensity were evaluated across fermentation stages. The results show that ester development varied across the fermentation cycle due to differences in yeast growth, temperature gradients, and dissolved oxygen availability. Moderate thermal control supported balanced fruity aroma, while uneven temperature distribution increased higher alcohol formation and ester variability. The study demonstrates that volatile ester development at industrial scale depends on both yeast metabolism and engineering control of fermentation conditions. Overall, process-scale monitoring improves aroma consistency and product quality in commercial ale production.