What are different types of yeast variants used in the fermentation of alcoholic beverages and what difference they generate in the beverage?

 There are several types of yeast variants used in the fermentation of alcoholic beverages, each with its own characteristics and effects on the final product. Here are some common ones:

1. Saccharomyces cerevisiae: This is perhaps the most widely used yeast in brewing and winemaking. It's known for its ability to efficiently convert sugars into alcohol and carbon dioxide. Different strains of S. cerevisiae can produce various flavors and aromas, contributing to the complexity of the final beverage.

2. Saccharomyces pastorianus: Also known as lager yeast, this strain is used primarily in the production of lagers. It ferments at lower temperatures compared to ale yeast (S. cerevisiae), resulting in a cleaner and crisper taste profile.

3. Brettanomyces: Commonly referred to as "Brett," this yeast is often used in the production of sour beers and some styles of wine. It produces funky and sour flavors, including barnyard, earthy, and fruity notes. While considered a spoilage organism in some contexts, it's intentionally used in controlled environments to create unique flavor profiles.

4. Pichia spp.: These yeast strains are often used in cider production. They can contribute to fruity and floral aromas, enhancing the complexity of the final cider.

5. Kluyveromyces spp.: Some strains of this yeast are used in the fermentation of traditional African beverages like palm wine. They can contribute to both the flavor and aroma profile of the beverage.

6. Schizosaccharomyces pombe: This yeast is less commonly used in brewing but is sometimes employed in cider production. It metabolizes malic acid, leading to a smoother taste in the final product.

The differences these yeast variants generate in the beverage primarily relate to the flavors and aromas they produce during fermentation. Factors such as temperature, fermentation time, and nutrient availability can also influence the yeast's performance and the resulting beverage characteristics. Additionally, some yeasts may have specific metabolic capabilities that affect factors like alcohol content, acidity, and mouthfeel.

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