Abstract
The objective of this research was to study the effect of diclofenac sodium compartmentalization on the physico-chemical properties (such as size, drug entrapment efficiency and percutaneous permeation across rabbit skin) of niosomal vesicles used as carriers. Niosomes were prepared starting from nonionic commercial surfactants belonging to the class of Polysorbates and Pluronics: mixtures of Span 60/F127 and Tween 60/F127 at different ratios were used to obtain vesicles and all formulations were compared in terms of dimensions, morphology, polydispersity index and entrapment efficiency. Moreover, the enhancing effect of niosomes on the ex vivo percutaneous penetration of diclofenac sodium was investigated using Franz-type diffusion chambers and compared to that obtained by using the corresponding drug solution. Results demonstrated that niosomes were spherical and homogeneous in shape. Their size was found to be dependent on the hydrophile-lipophile balance of the surfactant mixture: increasing hydrophobicity resulted in smaller vesicles. Drug incorporation led to a significant variation in vesicle size dependently from the compartment in which the drug was located. The permeation of diclofenac from free solution used as control was found to be lower respect to that obtained for all niosomal formulations, that can be considered as percutaneous permeation enhancers. In particular, the results indicated that the highest cumulative amounts of diclofenac permeated across rabbit skin after 24 h were obtained by formulations in which the drug was located in the aqueous core.
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Acknowledgments
MIUR, the Italian Ministry for University, is acknowledged for financial support (EX-60 %, PRIN 2010–2011, Prot. N. 2010H834LS004 and PON01_00293-Spread Bio Oil). Moreover, the project has been co-funded with support from the Commission European Social Fund and Region of Calabria (Italy) and LIPAC (Laboratorio di Ingegneria dei Processi Alimentari in Calabria). The authors are grateful to Dr Anna Internò for her assistance in English corrections.
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Tavano, L., de Cindio, B., Picci, N. et al. Drug compartmentalization as strategy to improve the physico-chemical properties of diclofenac sodium loaded niosomes for topical applications. Biomed Microdevices 16, 851–858 (2014). https://doi.org/10.1007/s10544-014-9889-6
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DOI: https://doi.org/10.1007/s10544-014-9889-6