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Contour plots for the interactive effects of (A) pressure and temperature; (B) extraction pressure and co-solvent concentration; (C) temperature and co-solvent concentration on the catechin- (CC), cyanidin-3-O-glucoside contents (Cy3GC), and total antioxidant activity (DPPH and CUPRAC assays) in black rosehip. The excluded variable was fixed at its optimal point.
