Abstract
Most foreign compounds (xenobiotics) are metabolised in vivo producing conjugates (e.g. glucuronldes, sulphates, amino acid conjugates), which are fairly strong organic acids and are readily excreted in either the urine or bile (see Williams and Millburn, 1975). Compounds excreted in the bile may eventually be eliminated in the faeces but prior to this they can undergo an enterohepatic circulation or be metabolised in the intestine by the enzymes of the gut microflora. The latter can carry out a considerable number of reactions on xenobiotics, particularly hydrolytic and reductive reactions, and in certain instances this can lead to the production of toxic metabolites (see Williams 1972). If the excretion of a compound in the bile leads to an enterohepatic circulation this will prolong the presence of the compound or its metabolites in the body. This increases the chances of toxic reactions occurring and may prolong the pharmacological effects of some substances. It is, therefore, important to know the types of xenobiotic compounds excreted in bile and whether this excretory pattern varies with species.
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Millburn, P. (1976). Excretion of Xenobiotic Compounds in Bile. In: Taylor, W. (eds) The Hepatobiliary System. NATO Advanced Study Institutes Series, vol 7. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8900-6_7
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