Phenylalanines (inci)

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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2-amino-3-phenylpropionic acid; 3-phenyl-L-alanine; CAS number:150-30-1; CAS number: 63-91-2; Phenylalanine; Phenylalaninum

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Phenylalanine is an aromatic, proteinogenic, alpha-amino acid which occurs in its L-form in nature as a protein component. Phenylalanine is an essential amino acid for humans. It is synthesized by plants and microorganisms via the so-called "shikimic acid-chorismic acid pathway" and is both glucoplastic and ketoplastic.

Phenyalanine is degraded in the organism by phenylalanine hydroxylase, initially via L-tyrosine, homogentisic acid and further intermediate steps to fumaric acid and acetoacetic acid. The lack of phenylalanine hydroxylase leads to the clinical picture of phenylketonuria, Fölling's disease.

Phenylalanine is sparingly soluble in water and sparingly soluble in ethanol. The substance is involved in the synthesis of several important hormones, messenger substances and compounds such as adrenaline, noradrenaline, dopamine or melanin.

Field of application/use
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Cosmetics: Phenylalanine is used in cosmetic formulations. The amino acid acts as an antistatic agent (reduces static electricity by neutralising the electrical charge on the surface, for example of hair). It improves combability, i.e. it reduces or prevents tangling of the hair due to changes or damage on the hair surface and thus improves combability.

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  1. Ammon HPT et al. (2014) Hunnius Pharmaceutical Dictionary 11th Edition Walter de Gruyter Berlin-New York S. 1386-1387


Last updated on: 29.10.2020