What is Light-struck?
Of course, if your beer is stored in opaque containers like kegs, cans, ceramic bottles, or stainless steel bottles, the taste will not change much. If your beer is stored in a green or transparent glass bottle, you need to be careful, the beer may have been Light-struck. Because transparent glass bottles cannot block any ultraviolet rays, green glass bottles can block about 20% of the ultraviolet rays, but 80% of the ultraviolet rays still enter the beer.
Why is beer skunked?
In 1875, German chemist Dr. Carl Lintner reported for the first time that beer exposed to light would form an unpleasant taste and smell. In 1960, Yoshiro Kuroiwa announced that the main component of the odor was MBT, which originated from the photolysis of isohumulones. In addition, the Kuroiwa team determined that the skunked taste would be more pronounced under the light in the blue part of the visible spectrum (350-500nm). Under strong sunlight, the reaction was almost instantaneous, and the tasting team could detect the presence of MBT in the beer exposed for less than 10 seconds. Under less harmful conditions, these reactions will still occur, but it can take days or even weeks to become apparent.
Light-struck and beer bottle types
What impact did light-struck have on the choice of beer bottles?
When the beer bottle does not provide protection, modern hop science provides an alternative that can prevent the formation of MBT from hops. “Tetra” and “Hexa” hops are modified by reductions in side-chain double bonds that prevent the photodegradation reaction. These advanced hop products are based on liquid or supercritical carbon dioxide extracts of hops, See humulone. These resins will in turn be alkaline It is isomerized to humulone in the solution, and isohumulone can be further reduced to produce bitter compounds that will not degrade into MBT. This kind of bitter hops with an advanced form is called a “light-stable” product. They are used in the brewing process to make beer less susceptible to the harmful effects of sunlight. But, sunlight may also produce other flavor changes that are not related to hops.
How to avoid stinking beer?
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