As an expert sommelier and brewer, I can provide some insight into the practice of putting a lime in a Corona beer. While there are various theories surrounding this tradition, one interesting theory suggests that the lime is actually meant to serve as an anti-bacterial agent.
Although this theory may not have a concrete historical basis, it does make some sense when you consider the conditions in which beers are often enjoyed, especially in warm climates or outdoor settings. In these situations, bottles may be exposed to various germs and bacteria, particularly on the surface where your mouth is about to make contact.
The idea behind adding a lime to a Corona is that the citric acid in the lime could potentially help kill off any harmful bacteria that may be lurking on the bottle. Lime is known to have antimicrobial properties, which could provide a small level of protection against any potential pathogens.
However, it's important to note that the antimicrobial properties of lime are not as potent as using proper cleaning and sanitizing methods. This theory should not be seen as a replacement for proper hygiene practices when it comes to handling and consuming beverages.
It's also worth mentioning that the tradition of adding a lime to a Corona may have more to do with taste and flavor than antibacterial properties. The addition of lime can enhance the overall drinking experience by adding a refreshing citrus note that complements the light and crisp characteristics of the beer.
Personally, I have enjoyed many Coronas with and without a lime, and I find that the lime adds a pleasant tangy element to the beer. It can also help cut through any residual bitterness, making for a more balanced and enjoyable sip.
While the theory of adding a lime to a Corona for its antibacterial properties may hold a certain level of truth, it is important to remember that proper hygiene practices should always be followed. The addition of a lime should be seen as a personal preference for flavor enhancement rather than a foolproof method of sanitization.