![]() Solutions of nitric acid containing mercuric nitrate reacts with phenols, producing red colors or yellow precipitates which react with nitric acid to form red solution. The reaction is due to the presence of the hydroxyphenyl group, C 6H 5OH in the amino acid molecule and any phenolic compound which is unsubstituted in the 3,5 positions such as tyrosine, phenol and thymol will give the reaction. For this reason the various color tests yield reactions varying in intensity and type of color according to the nature of groups contained in the particular amino acid under examination. Not all amino acids contain the same reactive groups. The R- in the above formula stands for different chemical groups (may be aliphatic, aromatic or heterocycylic) and this determines the characteristics of the amino acids.The color tests have frequently been used for qualitative detection of amino acids. ![]() ![]() As the name suggest amino acids are organic compounds that contain amino and carboxyl groups.
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