Proteins is polymer of amino acid which conected by peptide bond. There are 20 amino acids that arrange the proteins, the differ of protein has differ amino acids composition. Bellow you will see some test to detect proteins or certain amino acid.
1. Biuret test: to detect the presence of proteins, actually the presence of peptide bond
2. Ninhidrin test: to detect the presence of amino acids
3. Xanthoproteic test: to detect the presence of tyrosine, phenylalanine, and trypthophane
4. Milllon test: to detect the presence of tyrosine
5. Hopkins-Cole test: to detect the presence of trypthophan.
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