• 1. Department of Orthopedic Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;
  • 2. Trauma Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;
FANG Yue, Email: fangyue1968@163.com
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Objective  To observe the inhibitory characteristics of silver nanoparticles (AgNP) on bacterial biofilms and investigate their inhibitory effect on biofilm formation on three common orthopedic biomaterials. Methods  The minimal inhibitory concentration (MIC) and minimal biofilm inhibitory concentration (MBIC) of AgNP were determined by microplate dilution assay. Biofilms of Staphylococcus aureus (ATCC 25923) were cultured on three orthopedic biomaterials (titanium alloy, titanium oxide, and stainless steel) and intervened with AgNP at concentrations of 32, 16, 8, 4, 2 and 0 μg/mL to determine the MBICs on the three materials. The effects of AgNP on biofilm formation were analyzed by scanning electron microscopy and measuring optical density. Results  The MIC and MBIC of AgNP in the microplate assay were both 16 µg/mL. The MBICs of AgNP on biofilm formation in titanium oxide, titanium alloy, and stainless steel were 16 μg/mL, 32 μg/mL, and 32 μg/mL, respectively. Among the three materials, the lowest optical density was observed on titanium oxide, while the highest was on titanium alloy. Conclusions  AgNP has strong antibacterial biofilm characteristics and can prevent the formation of Staphylococcus aureus biofilm in vitro. Biofilm formation is most pronounced on titanium alloy, least on titanium oxide, and intermediate on stainless steel.

Citation: YAN Xin’an, Walter M Chirume, FANG Yue. Effect of silver nanoparticles on Staphylococcus aureus biofilm formation on different orthopedic biomaterials. West China Medical Journal, 2023, 38(7): 1047-1052. doi: 10.7507/1002-0179.202110174 Copy

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