2.6. Spray drying
A 100 ml of feed solutions (vinegar + encapsulant agents) were prepared
accordingly as mentioned in Table 1. Spray drying was performed using a
laboratory scale spray dryer (B-290, Buchi - Switzerland. The mixture was fed
into the main chamber through a peristaltic pump and the feed flow rate was
controlled by the pump rotation rate. The pressure of the compressed air was
maintained at 3 bars throughout the experiment. Inlet and outlet temperatures
were maintained at 150 and 80°C, respectively. Process yield was calculated from
the relationship between the total solid content in the produced powder and the
total solid content in the mixture.