Metabolism of 2,2, 4,4-tetrabromodiphenyl ether in rat and mouse

Abstract

The distribution and excretion of orally administered ¹⁴C-labelled 2,2',4,4'- etrabromodiphenyl ether (TBDE) have been studied in rat and mouse.

TBDE was efficiently absorbed and stored in adipose tissue where high concen rations were observed in both species.

In the rat, 86 % of the dose was retained after 5 days, while 14 % was excreted via the aeces and < 0-5 % via the urine.

The mouse excreted 20 % of the dose via the faeces and 33 % via the urine, the latter s a hydrophilic and labile metabolite.

Metabolites covalently bound to macromolecules and lipids were noted in tissues nd faeces from both species.

The major individual compound was parent TBDE in the faeces and tissues lthough small amounts of five hydroxylated metabolites were indicated by GC-MS.

In plasma from both rat and mouse only a few of the hydroxylated metabolites were resent, indicating selective retention of these metabolites.