2.4. Encapsulation by spray drying
The feed mixture was fed into a spray dryer (JCM Engineering Concept., Thailand) and the flow rate was maintained at 25 mL/min. The inlet air temperature of the spray dryer was operated at 140, 160 and 180 °C (SD/140 °C, SD/160 °C and SD/180 °C, respectively). The obtained powder was collected, packed in metallized bags, and stored at −20 °C until analysis.