About Amino acids An amino acid is any molecule that contains both amine and carboxyl functional groups. These amino acids are the basic components of proteins. There are twenty standard amino acids used by cells in protein biosynthesis that are specified by the general genetic code. Amino acids are joined to each other by peptide bonds. A peptide bond is a chemical bond formed between two molecules (carboxyl group of one molecule reacts with the amino group of the other molecule), releasing a molecule of water (H2O). The resulting CO-NH bond is called a peptide bond, the chemical bond that links the amino acid monomers in a protein chain. Each protein has its own unique amino acid sequence that is known as its primary structure. Amino acids can be linked together in varying sequences to form a huge variety of proteins. The unique shape of each protein determines its function in the body. Indications for Amino acids 1.Hypoproteinaemia 2.Pre and post surgery