Abstract
The distribution, retention and biotransformation of arsenocholine, an organic arsenic compound present in certain seafood, have been studied in rats, mice and rabbits by use of synthesized 73As-labelled arsenocholine. Orally administered arsenocholine was almost completely absorbed from the gastro-intestinal tract in mice and rats. In all species 70–80% of the administered dose was excreted in the urine within 3 days, [ 73As]arsenobetaine was the main urinary metabolite; [ 73As]arsenocholine was found in the urine of the first day only. No degradation to inorganic arsenic, mono- or dimethylarsenic acids, or trimethylarsine oxide was observed. In the tissue the 73As activity remained was found in the form of [ 73As]arsenobetaine and [ 73As]arsenophospholipids. Tissues with longest retention times were prostate, epididymis, testes, myocardium, liver, adrenal cortex, pancreas, dental pulp and pituitary gland.
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