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Particle size (PS; top figures), polydispersity (the value above the column on the top figures), and zeta potential (ZP; bottom figures) of naproxen-loaded biotin-graft-poly(lactic acid) nanoparticles (NPs) with/without dilution and pH changes, tested by dynamic light scatter (Zetasizer Nano S90; Malvern Instruments Ltd, Malvern, UK).
