All glucuronidation assays were performed for 2 hours in the presence of 10 μg microsomal proteins in a previously reported assay buffer [11, 12]. Kinetic parameters were assessed in liver and kidney samples using substrate concentrations ranging from 1 to 350 μM. The enzyme kinetic model was selected as recommended [25], using the Sigma Plot 11.2 assisted by Enzyme Kinetics 1.3 program (SSI, San Jose, CA).
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