Preparation and characteristics of octenyl succinic anhydride-modified partial waxy rice starches and encapsulated paprika pigment powder

Physicochemical properties and emulsion stability of octenyl succinic anhydride (OSA)-modified partial waxy rice Baegjinju starches which were made with different OSA additions and the color stability of the encapsulated paprika pigment powder using the OSA starch were investigated. The DSs of the OSA starches ranged from 0.0152 to 0.0269. The band at 3303 cm⁻¹ reduced as the OSA levels increased, but the A-type crystallinity was maintained. The oil absorption and emulsion stability, the short chain (DP6-12) amylopectin, the resistant starch levels, and the peak and final viscosities increased as the OSA levels increased. The encapsulated pigment powder with freeze-drying had higher color stability and better emulsion, and heating stabilities occurred with spray drying and the native pigment. From these results, it is suggested that the OSA-modified Baegjinju rice starch is a good wall material to protect lipophilic carotenoids. The encapsulated pigment powders could be used as stable natural colorants.