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biuret (biŽu-rәt)   a urea derivative that forms a chelate having an intense violet-red color with copper sulfate in alkaline solution; this reaction is known as the biuret reaction. The same reaction also occurs when compounds having two or more adjacent peptide bonds (for example, proteins), are reacted with copper sulfate in alkaline solution; this forms the basis for a colorimetric method for detection of protein, known as the biuret test.




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