phenylalanine

phenylalanine

 [fen″il-al´ah-nīn]

a naturally occurring amino acid, one of the essential amino acids, necessary for optimal growth in infants and for nitrogen equilibrium in adults.

phen·yl·al·a·nine (Phe, F),

(fen'il-al'ă-nēn),

2-Amino-3-phenylpropionic acid; the l-isomer is one of the common amino acids in proteins; a nutritionally essential amino acid.

phenylalanine

/phen·yl·al·a·nine/ (Phe) (F) (-al´ah-nēn) an aromatic essential amino acid necessary for optimal growth in infants and for nitrogen equilibrium in human adults.

phenylalanine

(fĕn′əl-ăl′ə-nēn′, fē′nəl-)

n.

An essential amino acid, C₉H₁₁NO₂, that occurs as a constituent of many proteins and is converted to tyrosine in the body.

phenylalanine (Phe)

[fen′ilal′ənēn]

an essential amino acid necessary for the normal growth and development of infants and children and for normal protein metabolism throughout life. The normal value of this amino acid in serum is less than 3 mg/dL in adults and 1.2 to 3.5 mg/dL in newborns. It is abundant in milk, eggs, and other common foods. See also amino acid, phenylketonuria, protein.

Chemical structure of phenylalanine

phenylalanine

Alternative pharmacology
A 50:50 mixture of dextro- and levo-forms of the amino acid phenylalanine, which is present in meats and cheeses. Phenylalanine is claimed to reverse ageing by boosting the internal supply of norepinephrine, and is allegedly useful for fatigue, depression, pain and other age-related phenomena. There is no peer-reviewed scientific evidence to support its alleged effects and benefits.

phen·yl·al·a·nine

(fen'il-al'ă-nēn)

One of the common amino acids in proteins; a nutritionally essential amino acid.

phenylalanine

One of the 20 AMINO ACIDS from which proteins are constructed. Phenylalanine is an essential amino acid and cannot be synthesized in the body; it must be provided in the diet.

Fig. 251 Phenylananine . Molecular structure.

phenylalanine (F, Phe)

one of 20 AMINO ACIDS common in proteins, which has a NONPOLAR'R’ structure and is relatively insoluble in water.

The ISOELECTRIC POINT of phenylalanine is 5.5.see PHENYLKETONURIA.

Phenylalanine

An essential amino acid that must be obtained from food since the human body cannot manufacture it.

Mentioned in: Phenylketonuria

phen·yl·al·a·nine

(F) (fen'il-al'ă-nēn)

One of the common amino acids in proteins; a nutritionally essential amino acid.

phenylalanine (fen´ilal´ənēn),

n one of the essential amino acids. See also amino acid.

phenylalanine

a naturally occurring amino acid essential for optimal growth in young animals and for nitrogen equilibrium in adults.

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phenylalanine deaminase test

a biochemical test used for the identification of enterobacteria, based on the formation of phenylpyruvic acid.