I was confused. Most of these green-bottle beers have a similar taste. But what about clear glass beer? Newcastle doesn’t taste like this? What about Bud Select 55? I am not ashamed to say that I also drink that beer. It is perfect for tailgating at a football game or sitting by the pool. But it doesn’t have that same taste of a green-bottle beer.
Here is my brother’s reply to this question (Eric Allain):
“Certain light sensitive compounds present in hops are the culprit of the skunky aroma which lead to the production of 3-methyl-2-butene-1-thiol (MBT). MBT has an extremely low flavor threshold and is very similar to the compound produced by skunks for defense.
Amber bottles block much of the wavelengths of light (~300-500nm) that lead to this photoxidation but green and clear bottles do not.
Corona IS skunky … this is why they serve it often with a lime to mask the smell. Also, the ‘skunkiness’ has become accepted in Corona as just part of the flavor.
Some of the macrobrew companies (Miller-Coors etc) use a hop extract that has been stabilized so that light will not lead to MBT production. Therefore they can use clear bottles without worry.
Since the MBT is derived from hop components, different beers with different amounts or types of hops may lead to varying levels of light induced MBT.
|Scooped by Sharrock|
This is an experiment some secondary chemistry teachers might try to reproduce on a weekend or over the summer break. It's also a great reminder that science is fun! What are some ways you might improve the information quality of this experiment?