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Atomic force microscopy images of the prepared samples. Qu, native quercetin; 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.
