Figure 4

Comparison between ultrasound and mechanistic shaker on lipase-catalyzed synthesis of D- isoascorbyl palmitate under the optimal conditions. (The reaction condition of mechanistic shaker was enzyme load of 20% (w/w), reaction temperature of 53°C, D-isoascorbic-to-palmitic acid molar ratio of 1:4, acetone 20 mL, 40 g/L of molecular sieves content, 150 rpm speed. The reaction condition of ultrasound was enzyme load of 9% (w/w), reaction temperature of 61°C, D- isoascorbic-to-palmitic acid molar ratio of 1:5, acetone 20 mL, 50 g/L of molecular sieves content, ultrasound power of 137 W).