Which chemical reaction primarily occurs during beer fermentation?

The process of beer fermentation is fundamentally centered around the conversion of sugars into alcohol and carbon dioxide by yeast. During fermentation, yeast consumes the fermentable sugars present in the wort, primarily from malted grains, and metabolizes them. This metabolic process leads to the production of ethanol (alcohol) and carbon dioxide as byproducts.

This reaction is essential for the brewing process and defines the alcoholic content of the beer. The carbon dioxide produced during fermentation also contributes to the carbonation of the beer. This specific metabolic process not only determines the alcohol content but also influences the flavor profile and overall character of the finished beer.

Understanding this key transformation during fermentation is crucial for brewers and beer enthusiasts alike, as it underscores the importance of fermentation in producing beer, leading to various styles and flavor experiences based on the yeast strains and sugar sources used. Other processes mentioned, such as evaporation of alcohol, oxidation of hop oils, or filtration of yeast, do not represent the primary reaction that occurs during fermentation itself.