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phenylalanine
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phenylalanine Figure 4: Enzyme defects in disorders of the amino acids phenylalanine and tyrosine.
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phenylalanine
phenylalanine Model of a phenylalanine molecule.

phenylalanine

chemical compound
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phenylalanine, an amino acid present in the mixture obtained upon hydrolysis of common proteins. Human hemoglobin (the oxygen-carrying pigment of red blood cells) is one of the richest sources of phenylalanine, yielding 9.6 percent by weight. First isolated in 1881 from lupine seedlings, phenylalanine is one of several essential amino acids for fowls and mammals; i.e., they cannot synthesize it and require dietary sources. Microorganisms synthesize it from glucose and pyruvic acid (products of the breakdown of carbohydrates). The chemical structure of phenylalanine isphenylalanine, chemical compound

This article was most recently revised and updated by Amy Tikkanen.