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Studies on the Disposition and Metabolism of Hydrazine in Rats in vivo

Toxicology Unit, School of Pharmacy, University of London, Brunswick Square, London WC1N 1AX, UK

Simin Ghatineh

Toxicology Unit, School of Pharmacy, University of London, Brunswick Square, London WC1N 1AX, UK

John A. Timbrell

Toxicology Unit, School of Pharmacy, University of London, Brunswick Square, London WC1N 1AX, UK

1 Rats were given various doses of hydrazine orally and their plasma and liver hydrazine levels were determined (at various times up to 270 min after dosing) by gas chromatography/ mass spectrometry.

2 The increase in the peak plasma level and in the area under the plasma concentration-time curve (AUC) were not directly proportional to the dose.

3 The ratio of plasma to liver hydrazine varied with dose suggesting saturation of an uptake mechanism might be occurring.

4 In a separate experiment hydrazine was still detectable in the plasma and liver 24 h after dosing with hydrazine i.p.

5 Rats were given the same doses of hydrazine and urine was collected for 24 h after dosing and assayed for hydrazine and acetylhydrazine. The proportion of hydrazine and acetylhydrazine excreted declined with dose.

6 Liver samples were taken for histopathological examination 96 h after dosing. Only after the highest dose (81 mg kg^-1) was there evidence of fatty liver, 96 h after a single dose, and a reduction in both liver and body weight.

Human & Experimental Toxicology, Vol. 11, No. 2, 121-127 (1992)
DOI: 10.1177/096032719201100211


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