As an expert sommelier and brewer, I have had the pleasure of working with various types of beers and understanding the factors that contribute to their freshness and shelf life. When it comes to kegs of beer, there are a few important considerations to keep in mind.
Firstly, it's crucial to distinguish between pasteurized and non-pasteurized beer. Non-pasteurized beer, also known as “craft” or “real” beer, is typically made with live yeast and is not subjected to the high-temperature pasteurization process. This process helps to preserve the beer's flavor and aroma but also means that it has a shorter shelf life.
For non-pasteurized beer that is dispensed with CO2, the general rule of thumb is that it will retain its freshness for about 45-60 days, assuming that proper pressure and temperature are maintained. This means storing the keg at the appropriate temperature, usually around 38-40°F (3-4°C), and ensuring that it is under the correct pressure, typically between 10-14 PSI.
The freshness of non-pasteurized beer is influenced by several factors. Firstly, exposure to oxygen can cause oxidation and spoil the beer, resulting in off-flavors and aromas. Therefore, it is crucial to handle and store the keg properly, minimizing oxygen exposure.
Secondly, the quality of the beer itself plays a role in its shelf life. Beers that are well-made, with high-quality ingredients and careful brewing techniques, tend to have a longer shelf life. On the other hand, beers that are poorly brewed or contaminated may spoil more quickly.
Now, let's talk about pasteurized draft beer. This type of beer undergoes a process where it is heated to a high temperature to kill any bacteria or yeast present, extending its shelf life. Pasteurized draft beer can typically last for around 90-120 days if stored correctly.
It's worth noting that while pasteurization helps to extend the shelf life, it can also affect the flavor profile of the beer. Some beer enthusiasts argue that pasteurization can result in a slightly muted or “cooked” flavor compared to non-pasteurized beer. However, this is subjective, and many people still enjoy the taste of pasteurized draft beer.
The freshness and shelf life of a keg of beer depend on various factors such as whether it's pasteurized or non-pasteurized, the quality of the beer, and how it is handled and stored. For non-pasteurized beer, aim to consume it within 45-60 days, while pasteurized draft beer can last for 90-120 days. Remember to maintain proper pressure and temperature, minimize oxygen exposure, and enjoy your beer while it's at its freshest!