This application note provides a method for determining the iodine value of beer using METTLER TOLEDO's UV/VIS spectrophotometer.
Why Is the Iodine Value of Beer Important?
Starch is a polysaccharide produced by plants as energy storage. During the malting, milling, and mashing of grain during the brewing process of beer, the starch breaks down into different sugars - such as maltose, glucose, and dextrin. Some of these sugars can be fermented to ethanol by yeast. The level of starch and dextrin in beer and wort is expressed with the iodine value.
How Is Iodine Value Determined?
This application note focuses on the starch content determination (expressed as iodine value) in different beer samples using METTLER TOLEDO's UV/VIS spectrophotometer. When iodine is reacted to the solution containing starch or dextrin, the color of the solution changes to red or blue. The absorbance of the solution is measured at 578 nm to get the iodine value and, in turn, the starch content in beer.
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