Overview
Brewer's yeast (Saccharomyces cerevisiae) is a microorganism essential for beer production through alcoholic fermentation. Brewing strains are specifically selected for their ability to metabolize malt sugars while producing desirable flavor compounds. There are two main categories: top-fermenting ale yeasts (15-24°C) and bottom-fermenting lager yeasts (7-13°C). Modern breweries often maintain proprietary strains that contribute to unique brand characteristics.
Physical and Chemical Properties
Active dry brewing yeast typically contains 5-10 billion cells per gram with 90-95% viability when properly stored. Key performance metrics include attenuation (70-85%), alcohol tolerance (5-12% ABV), and flocculation characteristics. The yeast metabolizes maltose and maltotriose during fermentation, producing ethanol, CO2, and flavor-active compounds like esters (fruity notes) and phenols (spicy notes). Viability decreases rapidly above 35°C, making temperature control critical.
Main Applications
Primary use is in beer production, where different strains create distinct beer styles. Ale yeasts produce more esters for fruity aromas, while lager yeasts yield cleaner profiles. Some breweries use mixed cultures for sour beers. Secondary applications include nutritional supplements (rich in B vitamins), bioethanol production, and as a flavoring agent in food products. Spent yeast from brewing is sometimes repurposed for animal feed.
Safety and Storage
Non-pathogenic and generally safe, though inhalation of dry yeast powder may cause respiratory irritation. Proper storage maintains viability: dry yeast should be kept airtight at 4°C (stable for 1-2 years), while liquid cultures require refrigeration and shorter shelf lives. Contamination risks include wild yeast (Brettanomyces) and bacteria. Professional breweries practice strict sanitation and often propagate yeast through multiple generations with quality controls.
B2B Procurement Guide
When sourcing, specify: yeast type (ale/lager), attenuation range, temperature tolerance, and flocculation properties. Consider pitch rate (typically 0.5-1.5 million cells/ml/°P) and oxygen requirements. Quality indicators include viability (>90%), contamination-free status, and consistent performance across batches. Many breweries establish long-term relationships with specialized yeast banks or maintain their own culture collections.
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