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Single-factor experiments of IL concentration (I–V represent the IL concentrations of 20%, 30%, 40%, 50%, and 60% (w/w)),ultrasonic irradiation time (I–V represent the ultrasonic irradiation time of 20, 30, 40, 50, and 60 min), and liquid–solid ratio (I–V represent the liquid–solid ratio of 10:1, 20:1, 30:1, 40:1, and 50:1) for the extraction of SDG using IL-UAE.
