Effect of Ultrasonic Modification on the Interaction between Blueberry Pectin and Cyanidin-3-O-Glucoside

This study involved the ultrasonic modification of water-soluble pectin, chelator-soluble pectin, and sodium carbonate-soluble pectin in blueberries using different ultrasonic treatments (688, 1376, 2063 W/cm2, 10, 20, 30 min). The research explored the relationship between the modified pectin structure and the interaction between pectin and cyanidin-3-O-glucoside (C3G). The results showed that ultrasonic modification resulted in enhanced interaction between pectin and C3G. After the ultrasonic treatment of 2063 W/cm2 for 10 min, all three pectins showed the maximum binding capacity with C3G, which was about 2~6 times higher than that without the ultrasonic modification. Whereas, prolonged ultrasonic time (20~30 min) was unfavorable for the interaction between modified pectin and C3G. After ultrasonic modification, the particle size of the pectin-C3G complexes became smaller, the Zeta potential was increased, and the physical stability was thus improved. In three different pectin samples, ultrasonic treatment