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The distribution in the mouse tissues of 13-[14C]-12,13-epoxtrichothec-9-ene administered intravenously was determined by whole-body autoradiography and by tracing the radioactivity of the tissues oxidized in an Auto Sample Oxidizer. The appearance of the label in urine and feces was also followed by the tracer technique. The distributions of radioactivity in tissues as determined by the two methods were almost identical. On the autoradiograms of mice killed 10 min after the injection, marked blackening of the film was observed at the sites corresponding to the liver, kidney, and bladder with urine, and much less darkening at other sites. The radioactivities contained in the liver, kidney, urine and small intestine were 13.3, 2.3, 2.6 and 10.2% of the dose, respectively. The labeled toxin was rapidly excreted into urine and feces, 56.0 and 4.9% in 6 hr and 66.7 and 28.0% in 24 hr after injection, respectively. Oral administration of the labeled toxin to mother mice resulted in the appearance of radioactivity in the stomach contents of 7-day suckling mice, thus demonstrating indirectly the secretion of the toxin into the milk. An attempt to show a respiratory route of excretion in rats given the radioactive compound orally or intravenously failed to detect any radioactivity in the expired CO2 collected for 6 hr, suggesting that the 14C in the epoxy ring was intact.

THE TISSUE DISTRIBUTION AND THE PATTERN OF EXCRETION OF [14C] -13-LABELED 12, 13-EPOXYTRICHOTHEC-9-ENE IN MICE AND RATS