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One of the twenty protein-building amino acids.
arginine, Arg, amino acid, protein, peptide, polypeptide, polar side chain, zwitterionic structure, peptide bond, amide bond, amino acid sequence, molecule, organic chemistry, chemistry, biology, biochemistry
Molar mass: 174.20 g/mol
Melting point: 238 °C
Density: 0.7 g/cm³ (20 °C)
Arginine is a semi-essential amino acid: the human body can only produce it under certain circumstances. It has basic side chains. It dissolves well in water. With acid dyes, arginine forms coloured salts that are insoluble in water, so arginine makes it possible to dye wool.
Arginine is found in all the proteins; most simple proteins consist mainly of this amino acid. Wool keratine contains about 10% arginine. It is usually produced by hydrolysis of gelatin. Biosynthesis of arginine proceeds from ornithine.
In the human body, arginine prevents the formation of blood clots, supports the functions of the immune system and the removal of toxins from the body, and aids in the regeneration of muscles. It is also used in wool dyeing.