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Effect of pH (A) and NaCl concentration (B) on the particle size and visual appearance of the prepared samples. CPP-Qu, quercetin-loaded casein phosphopeptides nanoparticles; CPP-CS-Qu, quercetin-loaded casein phosphopeptides/chitosan nanoparticles; CPP-CS-Qu (US); quercetin-loaded casein phosphopeptides/chitosan nanoparticles prepared by ultrasound. Different letters indicate significant differences (p < 0.05).
