a and b. The effect of ultrasonic pre-irradiation on B urkholderia cepacia lipase in the transesterification of ethyl butyrate with butanol in octane. EPRPs of ultrasonic pre-irradiated lipase/untreated lipase were prepared and used for the transesterification of ethylbutyrtae with n-butanol in n-octane as described in the materials and methods section. Note: (a) Initial rates of transesterification (b) conversion percentages. The experiments were carried out in triplicate. The error bar reflects the reproducibility for each data point.