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The three-dimensional plots of response surface. (a) The combined effects of ethanol concentration and solvent/material ratio (S/M) ratio when the extraction time was fixed at 60 min; (b) The interaction between ethanol concentration and extraction time when S/M ratio was fixed at 30 mL/g; (c) The combined effect of extraction time and S/M ratio when the ethanol concentration was fixed at 40%. TEAC, Trolox equivalent antioxidant capacity.
