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Physicochemical properties of the Ret-loaded lipid nanoparticles. (A) Particle size, (B) zeta potential, and (C) PDI of blank NLC with varying total lipid concentration at an SL ratio 7:3. (D) Particle size and (E) zeta potential of total lipid 0.5% (w/v) blank NLC with varying SL ratios. (F) Digital images of Ret-NE, Ret-NLC, and Ret-SLN. (G) Particle size, zeta potential, (H) EE, and (I) LC of Ret-NE, Ret-NLC, and Ret-SLN. The results are presented as the mean ± SD (n = 3).
