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Physico-chemical characterization of freeze-dried nanostructured lipid carriers: empty (NLC-empty) and oleuropein (OLE) loaded, with a targeted OLE loading of 30% (NLC-OLE30), 40% (NLC-OLE40) and 50% (NLC-OLE50) (w/w). (A) Particle size, Z potential, encapsulation efficiency, total released OLE and moisture content of NLCs. (B) In vitro release of OLE from developed NLCs. (C) TEM micrographs of OLE-loaded and empty nanoparticles. The scale bar indicates 100 nm.
