Chitosan and gum arabic as wall materials to encapsulate Hopea beccariana Burck stem bark extract into powder form by spray drying

This study aimed to encapsulate Hopea beccariana Burck stem bark extract into powder form using the spray-dryer method, with chitosan and gum arabic as wall materials. The encapsulation process was optimized by varying the wall materials to obtain the powder's desired physicochemical properties. The results showed that the combination of chitosan and gum arabic using a ratio of 5 mg/mL and 5 mg/mL, respectively, protected quercetin compounds of 51.13 mg/g from 71.37 mg/g and showed the inhibition zone of 10.48–14.18 mm and the minimum inhibitory concentration of 0.156 mg/mL. However, the minimum bactericidal concentration exceeded 5 mg/mL. The resulting powder had a particle size of 79.71 nm and a solubility of 89.6 %. The result showed that the potential of chitosan and gum arabic as wall materials in natural preservatives should be highlighted.