Investigations on the basis for the differential toxicity of hexachlorocyclopentadiene administered to rats by various routes
作者:
SalahM. El Dareer,
PatriciaE. Noker,
KathleenF. Tillery,
DonaldL. Hill,
期刊:
Journal of Toxicology and Environmental Health
(Taylor Available online 1983)
卷期:
Volume 12,
issue 2-3
页码: 203-211
ISSN:0098-4108
年代: 1983
DOI:10.1080/15287398309530419
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The differential disposition of hexachlorocyclopentadiene (HCCP) following oral administration, as contrasted to inhalation or intravenous administration, may account for its lower toxicity by this route. Following an intravenous dose [14C]HCCP to rats at 0.59 mg/kg, 39.0% of the radioactivity remained in the tissues at 72 h; after inhalation of vapors of [14C]HCCP (1.3–1.8 mg/kg), this amount was 71.5%. After oral doses of 4.1 or 61 mg/kg, however, the amount was only 2.4%. No detectable amount of intact HCCP was present in the lungs or kidneys of rats exposed to the chemical by inhalation, and only about 1% was converted to CO2, regardless of the route of administration. The chemical reactivity of HCCP with biological materials was evident in in vitro experiments, in which HCCP became bound to components of whole blood, plasma, liver homogenates, fecal homogenates, and intestinal contents. Thus, the lower toxicity of oral doses of HCCP may be related to its reaction with intestinal contents and its lack of absorption into tissues, in substantial amounts, as the intact, reactive form.
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