Violet Color Indicates the Presence of Protein in Food
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4 min read
In a well-known chemical test, a positive result for protein in a food sample is shown by a color change to violet or purple. This process, called the Biuret test, relies on a reaction between a copper-based reagent and the peptide bonds that link amino acids together in proteins. This simple visual indicator is a fundamental principle in food science and nutritional analysis.
