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The yield of tea polysaccharides (TPs) under different extraction solvents, ultrasonic time and water content. T: Extraction time, 1, 2, and 3 mean 20, 40, and 60 min. W: Water content, 1, 2, and 3 mean 10%, 20%, and 30%. CE: Choline chloride and ethylene glycol, 1:2 molar ratio; CH: Choline chloride and 1,6 hexanediol, 1:2 molar ratio; CB: Choline chloride and 1,4-butanediol, 1:4 molar ratio; Means with different letters indicate a significant difference (p < 0.05).
