Tag: Laboratory science

The color of iodine changes dramatically from yellowish-brown to a distinct blue-black in the presence of starch, a reaction central to its use in countless scientific and practical applications. This simple chemical principle is just one of many reasons a few drops of iodine have significant utility.

In a biological context, a significant finding is that biuret solution is used exclusively to test for the presence of proteins, not carbohydrates, fats, or other nutrients. This chemical test is a fundamental procedure in laboratories for identifying the protein component within various food groups.

Starch is a complex carbohydrate that plants use for energy storage, and its presence can be confirmed through a remarkably simple chemical test. Learning how can starch be detected is a fundamental concept taught in biology and chemistry, with the iodine solution being the key reagent for this colorful reaction.

According to the U.S. Food and Drug Administration (FDA), foods with 20% or more of the Daily Value for added sugars are considered a high source. When discussing what is 20 percent of sugar, however, the context—whether for a nutritional label, a recipe, or a lab experiment—is crucial for accurate interpretation and calculation.