Abstract
1. The biliary excretion of phenolphthalein di[35S]sulphate was studied in rats. 2. The conjugate was administered by continuous infusion at rates of 3, 4.5, 6, 9 and 12 mug/min, and kinetic analysis of the rate of biliary excretion was consistent with a two-compartment open-model system. 3. The results obtained after single injections of the ester were also consistent with the model. 4. An essential feature of the model is the presence of a compartment into which the ester may pass as an alternative to direct excretion via the bile. 5. It is suggested that such a compartment may be located within the liver.
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