[Excretion of p-chloroaniline metabolites into urine. Excretion of 2,4-dichloroaniline and p-chloroformanilide].

Previously, we identified by gas chromatography/mass spectrometry (GC/MS) urinary metabolites of p-chloroaniline (p-CA) in a patient with acute p-CA poisoning. Among these metabolites there is a possibility that 2,4-dichloroaniline (2,4-DCA) and p-chloroformanilide (p-CFA) are produced through some unknown metabolic pathways in human. In order to clarify whether 2,4-DCA and p-CFA were produced within the human body or not, an attempt was made to detect these metabolites in the patient's urine samples prepared by various pretreatments, using both GC/MS and high performance liquid chromatograph. In addition, the detection of these metabolites in non-exposed person's urine samples spiked with p-CA and 2-amino-5-chlorophenol was attempted by GC/MS using same the procedures in order to examine whether p-CA and 2-amino-5-chlorophenol excreted as metabolites were further changed to 2,4-DCA or p-CFA in the urine or not. 2,4-DCA was found abundantly in the ethereal extracts from the patient's urine samples hydrolyzed with hydrochloric, sulfuric and nitric acids, but only small amounts from intact urine samples by GC/MS. No 2,4-DCA was detected in the urine samples to which were added p-CA and 2-amino-5-chlorophenol. p-CFA was found in the ethereal samples which were extracted at acidic conditions from the patient's urine samples by GC/MS at the injection port temperature of 250 degrees C of the gas chromatograph, but the p-CFA peak disappeared at the injection port temperature of 150 degrees C.(ABSTRACT TRUNCATED AT 250 WORDS)