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. 2019 Sep 5;5(9):e02374. doi: 10.1016/j.heliyon.2019.e02374

Fig. 6.

Fig. 6

Response surface plots of the effect of factor interactions on quercetin extraction yield. (A) Effect of the interaction between ethanol concentration and the solid-to-liquid ratio; (B) Effect of the interaction between ultrasonic power and ethanol concentration; (C) Effect of the interaction between the solid-to-liquid ratio and ultrasonic power.