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Metronidazole loaded nanostructured lipid carriers to improve skin deposition and retention in the treatment of rosacea.

Drug Dev Ind Pharm. 2019 Feb 06;:1-30

Authors: Shinde UA, Parmar SJ, Easwaran S

Abstract
The objective of the present investigation was to improve the skin deposition and retention of metronidazole (MTZ) in rosacea therapy, by incorporating it into nanostructured lipid carriers (NLCs). The main challenge in this endeavour was the partial hydrophilicity of MTZ, which mandated careful selection of excipients, including solid and liquid lipids, surfactants, and their ratios in combination. NLCs were produced by the phase inversion temperature method and finally converted into a gel for topical application. The prepared nanoparticles were evaluated for their particle size, zeta potential, entrapment efficiency, solid state characteristics, surface morphology, in vitro drug release, and permeation through excised skin. The gel was additionally characterized for its pH, drug content, viscosity and spreadability. The prepared nanoparticles were spherical and of size below 300nm. Incorporation of judiciously chosen excipients made possible a relatively high entrapment efficiency of almost 40%. The drug release was found to be biphasic, with an initial burst release followed by sustained release up to 8 hours. In comparison to the plain drug gel, which had a tissue deposition of 11.23%, the NLC gel showed a much superior and desirable deposition of 26.41%. The lipophilic nature of the carrier, its size and property of occlusion enabled greater amounts of drug to enter and be retained in the skin, simultaneously minimizing permeation through the skin, i.e., systemic exposure. The results of the study suggest that NLCs of anti-rosacea drugs have the potential to be of use in the therapy of rosacea.

PMID: 30727789 [PubMed - as supplied by publisher]

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