ABSTRACT
Purpose
To prepare polyamide nanocapsules for skin photo-protection, encapsulating α-tocopherol, Parsol®MCX (ethylhexyl methoxycinnamate) and/or Parsol®1789 (butyl methoxydibenzoylmethane).
Methods
Nanocapsules were obtained by combining spontaneous emulsification and interfacial polycondensation reaction between sebacoyl chloride and diethylenetriamine. Nano-emulsions used as control were obtained by the same process without monomers. The influence of carrier on release rate was studied in vitro with a membrane-free model. Epidermal penetration of encapsulated sunscreens was ex vivo evaluated using Franz diffusion cells. Ability of encapsulated sunscreens to improve photo-stability was verified by comparing percentage of degradation after UV radiation exposure.
Results
Sunscreen-containing nanocapsules (260–400 nm) were successfully prepared; yield of encapsulation was >98%. Parsol®MCX and Parsol®1789 encapsulation led to decreased release rate by up to 60% in comparison with nano-emulsion and allowed minimum penetration through pig ear epidermis. Presence of polyamide shell protected encapsulated sunscreen filters from photo-degradation without affecting their activity.
Conclusions
Encapsulation of Parsol®MCX and Parsol®1789 into oil-core of polyamide nanocapsules allowed protection from photo-degradation, controlled release from nanocapsules, and limited penetration through pig ear epidermis.
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ACKNOWLEDGMENTS & DISCLOSURES
Nicolas Tsapis, Mounia Makhoukh, Ludivine Houel were gratefully thanked for their help for microscopic observations. Claire Troufflard and France Costa-Torro were gratefully thanked for their help for NMR analyses.
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Hanno, I., Anselmi, C. & Bouchemal, K. Polyamide Nanocapsules and Nano-emulsions Containing Parsol® MCX and Parsol® 1789: In Vitro Release, Ex Vivo Skin Penetration and Photo-Stability Studies. Pharm Res 29, 559–573 (2012). https://doi.org/10.1007/s11095-011-0592-5
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DOI: https://doi.org/10.1007/s11095-011-0592-5