Final answer:
Non-pasteurized (refrigerated) draft beer should ideally be consumed within a few days to a couple of weeks after tapping, with exact time varying based on factors like beer style and storage conditions. Keeping draft beer at or below 4 degrees C (40 degrees F) is important to maintain quality and prevent spoilage.
Step-by-step explanation:
When it comes to non-pasteurized (refrigerated) draft beer, its quality can begin to deteriorate after a relatively short period. Once tapped, refrigerated draft beer is best when consumed within a few days to a couple of weeks. This timeline can vary based on several factors including the style of the beer, the conditions under which it's kept, how the beer is stored, and the cleanliness of the draft lines. Craft beers, which are often not pasteurized, typically have a shorter shelf life due to their lack of preservatives and should be enjoyed closer to the tapping date to maintain their intended flavor profile.
Storing beer at the proper temperature is crucial to maintain its quality. Additionally, it is important to note that once non-pasteurized beer is exposed to air, oxygen can start to affect the taste through the process of oxidation. Therefore, it is important to keep draft beer sealed and refrigerated until it's ready to be served. This can extend the life and quality of the beer. As Louis Pasteur discovered, microorganisms are responsible for both fermentation and spoilage, so keeping beer cold helps preserve its quality for as long as possible. Refrigeration at or below 4 degrees C (40 degrees F) helps to inhibit bacterial growth which can cause spoilage.