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2,3-Dihydroxybenzoic Acid Electrospun into Poly(d,l-lactide) (PDLLA)/Poly(ethylene oxide) (PEO) Nanofibers Inhibited the Growth of Gram-Positive and Gram-Negative Bacteria

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Abstract

Widespread emergence of antibiotic-resistant pathogens in recent years has restricted the treatment options for various infectious diseases. Investigation of alternative antimicrobial agents and therapies is thus of utmost importance. Electrospinning of 50 mg/ml 2,3-dihydroxybenzoic acid (DHBA) into 24 % (w/v) poly(d,l-lactide) (PDLLA) and poly(ethylene oxide) (PEO) (1:1) produced nanofibers with an average diameter of 401 ± 122 nm. DHBA released from the nanofibers (315 ± 0.04 µg/ml within 2 h) inhibited the growth of Pseudomonas aeruginosa Xen 5, Klebsiella pneumoniae Xen 39, Escherichia coli Xen 14, Salmonella typhimurium Xen 26, and Staphylococcus aureus strains Xen 30, Xen 31, and Xen 36. The reason for the rapid diffusion of DHBA from PEO:PDLLA may be due to formation of hydrogen bonds between the hydroxyl groups of DHBA and the C=O groups of the PDLLA. DHBA formed a strong interaction with PDLLA and increased the thermal stability of the nanofiber mesh. The DHBA-containing nanofibers were non-hemolytic, suggesting that they may be incorporated in the development of a wound dressing.

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Acknowledgments

Ahire JJ is grateful to Claude Leon Foundation Postdoctoral Fellowship (2013–2014), Cape Town, South Africa, for financial support.

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Authors and Affiliations

  1. Department of Microbiology, University of Stellenbosch, Matieland (Stellenbosch), 7602, South Africa

    Jayesh J. Ahire, Tiaan D. J. Heunis & Leon M. T. Dicks

  2. Department of Chemistry and Polymer Science, University of Stellenbosch, Matieland (Stellenbosch), 7602, South Africa

    Ramesh Neppalli & Albert J. van Reenen

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  1. Jayesh J. Ahire
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Correspondence to Leon M. T. Dicks.

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Ahire, J.J., Neppalli, R., Heunis, T.D.J. et al. 2,3-Dihydroxybenzoic Acid Electrospun into Poly(d,l-lactide) (PDLLA)/Poly(ethylene oxide) (PEO) Nanofibers Inhibited the Growth of Gram-Positive and Gram-Negative Bacteria. Curr Microbiol 69, 587–593 (2014). https://doi.org/10.1007/s00284-014-0635-3

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