Spouted Bed Drying of Milk-Blackberry Pulp: Analysis of Powder Production Efficiency and Powder Characterization

Spouted bed drying of milk-blackberry pulp mixture at different ratios (V/V) was analyzed in this work. The effects of addition of adjuvant (maltodextrin, casein, and palm oil) in the milk-blackberry mixture and maltodextrin in the pure blackberry pulp were analyzed focusing on enhancing powder production efficiency. The best results were obtained for the paste composition of 25% concentrated milk-75% blackberry pulp (V/V) without addition of adjuvant, yielding stable fluid dynamic behavior, powder production efficiency greater than 60%, linear powder production kinetics, high anthocyanin content, and low final moisture content of the powder (3.08% wb).