One of the 20 amino acids that make up proteins.



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Serine (C₃H₇NO₃)


Molar mass: 105.09 g/mol

Melting point: 220 °C (428 °F)

Density: 1.603 g/cm³ (0.0579 lb/in³)


Serine is a non-essential amino acid; it can be produced by the human body. It forms white, sweet-tasting crystals. It is soluble in water, but insoluble in ether and ethanol.

Occurrence and production

Serine occurs in bound form in proteins; it also occurs as a free amino acid in plants. It is found in large quantities in silk proteins (e.g. sericin and fibroin).

It is synthesized through the hydrolisis of proteins that contain it.


Serine is a building block of different proteins. It is the precursor of folic acid and plays an important role in the synthesis of purine and pyrimidine compounds and certain amino acids.

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Amino acids

Amino acids are the monomers of proteins.

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