What type of yeast is Saccharomyces cerevisiae?

Saccharomyces cerevisiae is classified as a top-fermenting yeast primarily used in the production of ales and various other fermented beverages. This yeast strain tends to rise to the surface during fermentation, which is why it is referred to as "top-fermenting." It thrives at warmer fermentation temperatures, typically ranging between 60°F to 75°F (15°C to 24°C), which contributes to its suitability for ale production.

Top-fermenting yeast like Saccharomyces cerevisiae tends to produce unique flavor and aroma compounds, including esters and phenols, which play a significant role in characterizing the flavor profiles of different ales. In contrast, bottom-fermenting yeasts, such as Saccharomyces pastorianus (formerly Saccharomyces carlsbergensis), operate at cooler temperatures and settle at the bottom of the fermentation vessel.

Understanding the distinction between these yeast types is crucial for any advanced cicerone, as the choice of yeast impacts not only the fermentation process but also the final flavor, aroma, and mouthfeel of the beer.