Stuck fermentation is best defined as?

Stuck fermentation is best defined as?

• A. A gradual slowdown of fermentation over months
• B. A fermentation that completes quickly
• C. A fermentation that produces excessive carbon dioxide
• D. A disastrous and sudden shutdown of yeast activity

Answer: (D)

Stuck fermentation is when yeast suddenly stops working before all fermentable sugar has been converted, causing the process to halt abruptly. This isn’t a gradual slow-down or a fermentation that finishes quickly; it’s a real drop in yeast activity that leaves residual sugar behind and can leave the wine sweeter and still-fermenting than intended. The idea behind this definition is that the problem is the abrupt cessation of the organism’s activity, not just a change in pace or a different end result. In practice, this abrupt shutdown signals something stressful to the yeast—nutrient deficiency, temperature or alcohol stress, or other inhibitors—and requires intervention to restart fermentation.

Stuck fermentation is when yeast suddenly stops working before all fermentable sugar has been converted, causing the process to halt abruptly. This isn’t a gradual slow-down or a fermentation that finishes quickly; it’s a real drop in yeast activity that leaves residual sugar behind and can leave the wine sweeter and still-fermenting than intended. The idea behind this definition is that the problem is the abrupt cessation of the organism’s activity, not just a change in pace or a different end result. In practice, this abrupt shutdown signals something stressful to the yeast—nutrient deficiency, temperature or alcohol stress, or other inhibitors—and requires intervention to restart fermentation.