Background: In this study, fluorescein labeled SLN and NLC formulations
were prepared for improving the dermal distribution of the hydrophilic active
ingredients and for enhancing the skin penetration.
Methods: To determine skin distribution of the lipid nanoparticles ex-vivo penetration/
permeation experiments were performed using full thickness rat skin by means
of Franz diffusion cells. Studies on the localization of fluorescence labeled nanoparticles
were performed by confocal laser scanning microscopy (CLSM). Cellular uptake
studies were performed on human keratinocyte cell line (HaCaT) and visualized
by fluorescence microscope. Both tissue and cell uptake were also quantitatively determined
by means of fluorimetric method in the skin extract or cell extract.
Results: Both imaging and quantification studies suggest that the dermal localization of the lipid
nanoparticles depends on their dimensions and particle size distribution. The CLSM images clearly
show that the Tripalmitin based lipid nanoparticles have higher accumulation in the skin. It is possible
to overcome the stratum corneum barrier function with T-NLC05 coded lipid nanoparticle formulation.
Additionally cellular uptake of this NLC formulation is time dependent.
Conclusıon: It can be concluded that this formulation is promising for treating local skin disorders
without systemic side effects. On the other hand obtained results suggest that optimum formulation
(T-NLC05) might be an interesting option even for novel cosmetic products.