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

Fig. 1.

Fig. 1

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