“…To determine the kinetic parameters of CtUGT3 for naringenin, assays containing 50 mM Na 2 HPO 4 −NaH 2 PO 4 (pH 8.0), 1 μM CtUGT3, saturating UDP-glucose, and varying concentrations (5,10,20,40,80,100,200, 400, 800, 1000, and 1500 μM) of naringenin were performed at 37 °C for 5 min with a final volume of 100 μL. To determine the kinetic parameters of CtUGT3 for apigenin, assays containing 50 mM Na 2 HPO 4 −NaH 2 PO 4 (pH 8.0), 1 μM CtUGT3, saturating UDP-glucose, and varying concentrations (5,10,20,40,80,100,200, 400, 800, 1000, and 1500 μM) of apigenin were performed at 37 °C for 5 min with a final volume of 100 μL. To determine the kinetic parameters of CtUGT3 for kaempferol, assays containing 50 mM Na 2 HPO 4 −NaH 2 PO 4 (pH 8.0), 1 μM CtUGT3, saturating UDP-glucose, and varying concentrations (100, 200, 400, 800, 1000, 1200, 1600, 1800, 2000, and 2400 μM) of kaempferol, were performed at 37 °C for 5 min with a final volume of 100 μL.…”