Abstract
An unknown Bratton-Marshall-positive compound was observed when liver extracts were screened by a procedure for the simultaneous determination of sulfamethazine and sulfathiazole in swine livers. The unknown has been conclusively identified as o-aminobenzoic acid (anthranilic acid), a tryptophan metabolite, by gas-liquid chromatography-mass spectrometry of swine liver extracts obtained by a modified Tishler procedure for sulfonamide residues in animal tissues.
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