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Three-dimensional response surface (a) and two-dimensional contour plot (b) of the model for determination of total phenol content for solvent-solid ratio of 20 mL/g; three-dimensional response surface (c) and two-dimensional contour plot (d) of the model for determination of total tannin content for solvent-solid ratio of 20 mL/g; three-dimensional response surface (e) and two-dimensional contour plot (f) of the model for determination of antioxidant activity for 35 min.
