When it comes to brewers yeast, it is important to understand that it is not a single entity, but rather a term used to encompass different types of yeast used in brewing. One of the main distinctions within brewers yeast is the categorization into ale yeast and lager yeast.
Ale yeast, also known as top-fermenting yeast, is a specific type of brewers yeast that belongs to the species Saccharomyces cerevisiae. This yeast strain is commonly used in the production of ales, which are a type of beer that is fermented at warmer temperatures. Ale yeast is known for its ability to ferment sugars at higher temperatures, typically between 60-75°F (15-24°C), and it tends to produce more fruity and estery flavors in the beer.
Lager yeast, on the other hand, is classified as a bottom-fermenting yeast and belongs to the species Saccharomyces uvarum. Lager yeast is used in the production of lagers, which are beers that are fermented at cooler temperatures. Lager yeast ferments sugars at lower temperatures, usually between 45-55°F (7-13°C), and it produces a clean and crisp flavor profile in the final beer.
It is important to note that while ale yeast and lager yeast are different strains of brewers yeast, they both belong to the same species, Saccharomyces. However, their different fermentation characteristics and temperature requirements result in distinct beer styles and flavor profiles.
Within the categories of ale yeast and lager yeast, there are further breakdowns into specific strains. Each strain of yeast can contribute unique flavors, aromas, and fermentation characteristics to the beer. For example, within the ale yeast category, you may come across strains such as American Ale yeast, English Ale yeast, Belgian Ale yeast, and more. Similarly, the lager yeast category includes strains like German Lager yeast, Czech Lager yeast, and so on.
As a sommelier and brewer, I have had the opportunity to work with different strains of brewers yeast in my brewing experiments. Each strain brings its own personality to the beer, and it is fascinating to see how the choice of yeast can impact the final product. I have brewed ales using different ale yeast strains and have noticed variations in the fruity and estery flavors produced. Similarly, when brewing lagers with different lager yeast strains, I have observed differences in the clean and crisp characteristics of the beer.
Brewers yeast is a broad term that encompasses different types of yeast used in brewing. Ale yeast and lager yeast are two main categories within brewers yeast, with each having its own specific characteristics and strains. While they belong to the same species, Saccharomyces, they differ in terms of fermentation temperature and flavor profiles. Understanding these distinctions allows brewers to create a diverse range of beer styles with unique flavors and aromas.