TABLE 2

SN-38 lactone and carboxylate glucuronidation rates in rat hepatic and intestinal microsomes

Study performed with an incubation time that only permitted 2.5% conversion of lactone to carboxylate or carboxylate to lactone. Values in parentheses indicate the standard deviation between the averages of two different experiments (each with three replicates).


Matrix

Lactone

Carboxylate
pmol/min/mg protein pmol/min/mg protein
Rat intestinal microsomes 18.5 (1.6) 6.5 (0.6)
Rat hepatic microsomes
5.7 (0.6)
3.0 (0.4)