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. 2022 Jan 12;83:105916. doi: 10.1016/j.ultsonch.2022.105916

Fig. 2.

Fig. 2

Response surface plots showing the effects of variables on total flavonoid content (mg QE/100 g dry wt.) (a) temperature was constant at 50 °C (b) amplitude was constant at 40% and (c) time was constant at 35 min.