Journal
SMALL
Volume 16, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202000436
Keywords
antibacterial; mesoporous silica; photothermal therapy; silver-bismuth nanocrystals; skin infection
Categories
Funding
- NNSF of China [61525402, 61775095]
- Jiangsu Provincial Key Research and Development Plan [BE2017741]
- Natural Science Foundation of Jiangsu Province [BK20181077]
- Nanjing Polytechnic Institute startup fund [NHKY-2019-19]
- Natural Science Foundation of the Jiangsu Higher Education Institutions [19KJB150030, 19KJB150031]
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The emergence of multidrug resistant bacteria has resulted in plenty of stubborn nosocomial infections and severely threatens human health. Developing novel bactericide and therapeutic strategy is urgently needed. Herein, mesoporous silica supported silver-bismuth nanoparticles (Ag-Bi@SiO2 NPs) are constructed for synergistic antibacterial therapy. In vitro experiments indicate that the hyperthermia originating from Bi NPs can disrupt cell integrity and accelerate the Ag ions release, further exhibiting an excellent antibacterial performance toward methicillin-resistant Staphylococcus aureus (MRSA). Besides, under laser irradiation, Ag-Bi@SiO2 NPs at 100 mu g mL(-1) can effectively obliterate mature MRSA biofilm and cause a 69.5% decrease in the biomass, showing a better therapeutic effect than Bi@SiO2 NPs with laser (26.8%) or Ag-Bi@SiO2 NPs without laser treatment (30.8%) groups. More importantly, in vivo results confirm that approximate to 95.4% of bacteria in abscess are killed and the abscess ablation is accelerated using the Ag-Bi@SiO2 NPs antibacterial platform. Therefore, Ag-Bi@SiO2 NPs with photothermal-enhanced antibacterial activity are a potential nano-antibacterial agent for the treatment of skin infections.
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