Using Store-bought Beer as a Starter for Brewing: Is It Possible?

Many homebrew enthusiasts are curious about using store-bought beer as a starter for making their own brew. While this method has been attempted on occasion, the results are often inconsistent and unreliable. In this article, we will explore the feasibility of using store-bought beer for brewing and discuss the best practices for ensuring a successful batch of homemade beer.

Why Use Store-bought Beer?

Using store-bought beer as a starter is tempting because it is readily available and often of good quality. It is also less expensive than purchasing specific yeast strains for brewing. However, store-bought beers, while delicious, are not ideal for fermentation processes. This is because modern industrial brewing practices have largely eliminated the live active yeast that would be necessary for the brewing process.

Historical Context and Modern Considerations

Historically, certain brands of store-bought beer, like Guinness, were favored as a source of brewers' yeast. This was due to the fact that Guinness was once bottled with live yeast, which could be harvested for brewing. However, as brewing techniques and quality standards have evolved, modern Guinness and other beers are packaged with sterilized contents, often with a widget to provide carbonation.

Current Challenges with Store-bought Beer

Today, finding a reliable source of brewers' yeast from store-bought beer can be challenging. Many breweries now pasteurize their beers, which kills the active yeast cells. This process is done to extend the shelf life of the beer and prevent spoilage. Additionally, the addition of adjuncts like preservatives and artificial carbonation further complicates the brewing process.

Recommended Alternatives

For those looking to brew at home, it is recommended to use specifically purchased yeast strains. These are tailored for brewing and provide the necessary fermentation capabilities. Here are some reliable options:

Worthington White Shield – A historic British ale that can still be a decent source of live active yeast. Specific Yeast Packages – Available at homebrew supply stores and online, these ensure that you have the right strains for your brewing project.

Yeast can also be purchased in liquid or dried forms, which are easy to use and provide consistent results. Additionally, the fermentation process requires yeast that can survive in a low-nutrient environment, unlike the yeast in commercial beers which is adapted to a higher-energy environment.

Myth Busting: Can Store-bought Beer Explode?

A common concern among homebrewers is whether store-bought beer could explode if it contains active yeast. The simple answer is no. Store-bought beers are typically pasteurized and contain no active yeast. Pasteurization involves heating the contents to kill all microorganisms, including the yeast. Therefore, there is no risk of your stored beer exploding. Kombucha, kimchi, or sauerkraut, on the other hand, are all fermented and contain active cultures, which is why caution is advised when handling these products.

Conclusion

In conclusion, while it is possible to use store-bought beer as a starter for brewing, it is not the recommended or most reliable method. For best results, homebrewers should invest in dedicated brewing yeast and follow established brewing protocols. This ensures that the fermentation process is successful, leading to a high-quality, safe, and enjoyable result.

FAQs

Q: Can store-bought beer still have active yeast?

Store-bought beers have been pasteurized, which kills any active yeast. The yeast present is typically non-viable and is used for carbonation or flavor enhancement, not brewing.

Q: Are Worthington White Shield or other store-bought beers still a good source of yeast?

While historical brands like Worthington White Shield were once good sources of yeast, the modern brewing process has significantly reduced their viability. Specialized yeast strains are the best choice for brewing.

Q: What are the risks of using store-bought beer for brewing?

There is no risk of a store-bought beer exploding, but it lacks the necessary live active yeast to ensure a successful fermentation. This can lead to inconsistent and poor-tasting results.