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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Phenylpyruvic acid may be a direct precursor of mandelic acid without intermediate transamination of phenylalanine.

A series of compounds related to phenylalanine was administered to rats. Output of mandelic acid, a major but unexplained metabolite in phenylketonuria, was increased after the administration of phenylethanolamine or phenylpyruvic acid, whereas phenylethylamine or phenylalanine increased its excretion only marginally. Phenylacetic acid, previously suggested as a possible precursor in man, was almost without effect. It seems likely that mandelic acid can be formed from phenylpyruvic acid directly, without intermediate transamination to phenylalanine.[1]

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