Green Extraction of Tea Polysaccharides Using Ultrasonic-Assisted Deep Eutectic Solvents and an Analysis of Their Physicochemical and Antioxidant Properties

In this study, the ultrasonic-assisted extraction of deep eutectic solvents (UADES) for tea polysaccharides was optimized, and their physicochemical properties and antioxidant activities were analyzed. The optimal DES comprised choline chloride (CC) and ethylene glycol (EG) in a molar ratio of 1:3, with a water content of 40%. The optimized condition was an extraction temperature of 61 ◦C, an ultrasonic power of 480 W, and an extraction time of 60 min. The UADES extraction rate of...