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A simple method is described for the rapid quantitative analysis of N-acetyl-p-amino-phenol (APAP) in urine. APAP and its conjugates present in the urine following the ingestion of acetophenetidin, APAP or acetanilid, are hydrolyzed with acid to p-aminophenol. This compound is coupled with phenol in the presence of hypobromite to form an indophenol dye whose concentration is determined spectrophotometrically. Application of this method to a study of 3 human subjects treated with acetophenetidin is described.
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Welch et al. (1965) studied this question.
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