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Triclosan resistance reversion by encapsulation in chitosan-coated-nanocapsule containing α-bisabolol as core: development of wound dressing

Authors De Marchi JG, Jornada DS, Silva FK, Freitas AL, Fuentefria AM, Pohlmann AR, Guterres SS

Received 6 June 2017

Accepted for publication 9 August 2017

Published 25 October 2017 Volume 2017:12 Pages 7855—7868


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Professor Israel (Rudi) Rubinstein

João Guilherme B De Marchi,1 Denise S Jornada,1 Fernanda K Silva,1 Ana L Freitas,2 Alexandre M Fuentefria,2 Adriana R Pohlmann,1,2 Silvia S Guterres1

1Pharmaceutical Sciences Graduate Program, 2Department of Organic Chemistry, Institute of Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil

Abstract: The use of nanoparticles may be particularly advantageous in treating bacterial infections due to their multiple simultaneous mechanisms of action. Nanoencapsulation is particularly useful for lipophilic drugs. In this scenario, triclosan is considered a good candidate due to its lipophilicity, broad-spectrum activity, and safety. In the present study, we have developed and characterized an antimicrobial suspension of triclosan and α-bisabolol against pathogenic strains that are resistant (Pseudomonas aeruginosa) and susceptible (Escherichia coli, Staphylococcus aureus, and Candida albicans) to triclosan. We also aimed to determine the minimum inhibitory concentration, using serial microdilution adapted from a CLSI methodology (Clinical and Laboratory Standards Institute). Challenge test was used to confirm the antimicrobial effectiveness of the nanocapsule formulation, as well as after its incorporation into a commercial wound dressing (Veloderm®). The zeta potential of P. aeruginosa before and after contact with cationic nanocapsules and the ratio between the number of nanocapsules per colony forming unit (CFU) were determined to evaluate a possible interaction between nanocapsules and bacteria. The results showed that nanoencapsulation has improved the antimicrobial activity when tested with two different methodologies. The number of nanocapsules per CFU was high even in great dilutions and the zeta potential was reverted after being in contact with the cationic nanocapsules. The nanocapsules were able to improve the activity of triclosan, even when tested within 28 days and when dried in the wound dressing.

Keywords: antimicrobial effect, triclosan, α-bisabolol, chitosan, nanocapsules

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