Self‐Assembly of Antimicrobial Peptides on Gold Nanodots: Against Multidrug‐Resistant Bacteria and Wound‐Healing Application |
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Authors: | Wei‐Yu Chen Hsiang‐Yu Chang Jenn‐Kan Lu Yi‐Cheng Huang Scott G. Harroun Yu‐Ting Tseng Yu‐Jia Li Chih‐Ching Huang Huan‐Tsung Chang |
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Affiliation: | 1. Department of Chemistry, National Taiwan University, Taipei, Taiwan;2. Department of Aquaculture, National Taiwan Ocean University, Keelung, Taiwan;3. Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan;4. Department of Bioscience and Biotechnology, National Taiwan Ocean University, Keelung, Taiwan;5. Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung, Taiwan;6. School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan |
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Abstract: | Photoluminescent gold nanodots (Au NDs) are prepared via etching and codeposition of hybridized ligands, an antimicrobial peptide (surfactin; SFT), and 1‐dodecanethiol (DT), on gold nanoparticles (≈3.2 nm). As‐prepared ultrasmall SFT/DT–Au NDs (size ≈2.5 nm) are a highly efficient antimicrobial agent. The photoluminescence properties and stability as well as the antimicrobial activity of SFT/DT–Au NDs are highly dependent on the density of SFT on Au NDs. Relative to SFT, SFT/DT–Au NDs exhibit greater antimicrobial activity, not only to nonmultidrug‐resistant bacteria but also to the multidrug‐resistant bacteria. The minimal inhibitory concentration values of SFT/DT–Au NDs are much lower (>80‐fold) than that of SFT. The antimicrobial activity of SFT/DT–Au NDs is mainly due to the synergistic effect of SFT and DT–Au NDs on the disruption of the bacterial membrane. In vitro cytotoxicity and hemolysis analyses have revealed superior biocompatibility of SFT/DT–Au NDs than that of SFT. Moreover, in vivo methicillin‐resistant S. aureus–infected wound healing studies in rats show faster healing, better epithelialization, and are more efficient in the production of collagen fibers when SFT/DT–Au NDs are used as a dressing material. This study suggests that the SFT/DT–Au NDs are a promising antimicrobial candidate for preclinical applications in treating wounds and skin infections. |
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Keywords: | antimicrobial agents gold nanodots self‐assembly surfactin wound healing |
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