The serum half-life of bovine [3H]acetyltrypsin was estimated to be 9 rain following intravenous administration in rats. This was maintained when six successive doses of 200 μg each were given at 1-h intervals. The enzyme was removed from the circulation after complexing with α2-macroglobulin (α2-M). The amount of3H label appearing in bile increased with each successive dose and this was associated with breakdown products (<10 000 daltons) of the α2-M/[3H] acetyltrypsin. Intact α-M/[3H] acetyltrypsin was recovered from bile but represented only 0.06% of the administered dose of active enzyme.

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