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Effect of agitation speed on the percentage yield of kojic acid palmitate by using different impeller designs in a 0.5-L stirred-tank reactor. (Working volume: 0.2 L, substrate ratio: 6.74, enzyme loading: 1.96% (w/v), reaction temperature: 45.9 °C, reaction time: 20 h). Letters a and b indicate significant difference at p <0.05 with Bonferroni’s multiple comparison test. RT: Rushton turbine; PBT: pitch-blade turbine.
