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Effect of Liquid Crystalline Systems Containing Antimicrobial Compounds on Infectious Skin Bacteria

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Abstract

This study aimed (i) to prepare liquid crystalline systems (LCS) of glyceryl monooleate (GMO) and water containing antibacterial compounds and (ii) to evaluate their potential as drug delivery systems for topical treatment of bacterial infections. Therefore, LCS containing CPC (cetylpyridinium chloride) (LCS/CPC) and PHMB (poly(hexamethylene biguanide) hydrochloride) (LCS/PHMB) were prepared and the liquid crystalline phases were identified by polarizing light microscopy 24 h and 7 days after preparation. The in vitro drug release profile and in vitro antibacterial activity of the systems were assessed using the double layer agar diffusion method against Staphylococcus aureus, methicillin-resistant S. aureus, Staphylococcus epidermidis, Escherichia coli, and Enterococcus faecalis. The interaction between GMO and the drugs was evaluated by a drug absorption study. Stable liquid crystalline systems containing CPC and PHMB were obtained. LCS/PHMB decreased the PHMB release rate and exerted strong antibacterial activity against all the investigated bacteria. In contrast, CPC interacted with GMO so strongly that it became attached to the system; the amount released was not sufficient to exert antibacterial activity. Therefore, the studied liquid crystalline systems were suitable to deliver PHMB, but not CPC. Accordingly, it was demonstrated that GMO interacts with each drug differently, which may interfere in the final efficiency of GMO/water LCS.

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Acknowledgements

The authors thank the Coordination for the Improvement of Higher Education Personnel (CAPES, Brazil) and the National Council for Scientific and Technological Development (CNPq, Brazil) for their financial support to this study.

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Authors and Affiliations

  1. Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Block S, Lab 60, Av. do Café, s/n, Bairro Monte Alegre, Ribeirão Preto, 14040-903, SP, Brazil

    Carla Souza & Marilisa Guimarães Lara

  2. Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil

    Evandro Watanabe

  3. Department of Physics and Chemistry, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil

    Carolina Patrícia Aires

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  1. Carla Souza
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  2. Evandro Watanabe
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  3. Carolina Patrícia Aires
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  4. Marilisa Guimarães Lara
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Correspondence to Marilisa Guimarães Lara.

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Souza, C., Watanabe, E., Aires, C.P. et al. Effect of Liquid Crystalline Systems Containing Antimicrobial Compounds on Infectious Skin Bacteria. AAPS PharmSciTech 18, 2110–2119 (2017). https://doi.org/10.1208/s12249-016-0690-0

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