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. 2021 Apr 15;10(4):607. doi: 10.3390/antiox10040607

Figure 7.

Figure 7

Response surface for predicting DPPH, FRAP and TEAC antioxidant activity in walnut flower extracts. X1—extraction time (min); X2—solvent (Acetone); X3—water in solvent (%, v/v). The regions in red represent the domains of working conditions assuring the maximum extraction yield for the evaluated bioactive compounds.