Xanthoproteic reaction

The xanthoproteic reaction is a method that can be used to determine the amount of protein soluble in a solution, using concentrated nitric acid. The test gives a positive result in those proteins with amino acids carrying aromatic groups, especially in the presence of tyrosine. If the test is positive the proof is neutralized with an alkali, turn...
Found on http://en.wikipedia.org/wiki/Xanthoproteic_reaction
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