Alcohol in the news; The science behind "skunked" beer

From the buzz

The science behind "skunked" beer; How to prevent it from happening to yours

Skunked beer is a problem that we all face at some point in time during our drinking careers and it is most definitely something we can avoid. See what’s actually happening is known as a beer being “Light Struck,” in the beer connoisseur world. This happens more commonly to clear and green bottled beers than brown and can be an inconvenience that is only surpassed with the guzzling of several drinks prior.

...

The actual science can best be stated by two guys that go by the name Alstrom Bros in the article "Skunked Beer" at Beeradvocate.com, “Hop-derived molecules, called isohumulones, are basically ripped apart. Some of these parts bind with sulfur atoms to create that “skunk” character, which is similar in character to a skunk's natural defense and is such a potent compound that parts-per-trillion can be detected and even ruin a beer” (2003).

The author then recommends to not purchase more beer than you can drink at any point.

First, don’t buy the front case of beer in a very well lit refrigerator and avoid the refrigerator at all possible costs.

This is good advice for several reasons. (Especially if you are purchasing a beer that can have a tendency to be skunked). Beer in the front of the cooler was probably put there by the distributor or stock person. That should be the beer that has been in the store the longest. If there is an expiration date, that's the beer that's closest to expiring. The beer in the back of the cooler is the newest beer put in. It's the freshest. Additionally, beer in the back hasn't been exposed to as much sunlight or fluorescent light (the things that cause the hops to break down).

Second, aim for six packs of beer with a very high cardboard case. A case that covers as much of the bottles of beer as possible is always your best bet.

Sam Adams is proud of their tall cases. If you purchase beer that is completely covered by a box (like a 12 pack or case) you won't have as much chance for a skunky problem.

Oddly, the one thing not mentioned to prevent a beer from skunking isn't mentioned.

Purchase cans.