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(a) In vitro release study and (b) in vitro permeation study of capsaicin solution (-○-), chili extract solution (-∆-), SLN chili (-◊-) and NLC chili (-□-) at various times within 24 h. (n = 3). Abbreviations: SLN, solid lipid nanoparticles; NLC, nanostructured lipid carriers. * The value represents a significant difference (p < 0.05) from other formulations.
