具有协同抗菌能力的抗褐变纳米银-氧化铈复合材料的制备与表征
Preparation and Characterization of an Antibrowning Nanosized Ag-CeO Composite with Synergistic Antibacterial Ability.
作者信息
Yang Min, Liu Mi, Shen Genli, Gong Yan, Wang Zhen, Ji Daiyu, Li Jianqiang, Yuan Min, Wang Qi
机构信息
School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, China.
出版信息
Materials (Basel). 2023 Aug 8;16(16):5505. doi: 10.3390/ma16165505.
Nanosized Ag and CeO particles obtained through the hydrothermal method were physically mixed to obtain composite antibacterial agents. The comparative experiments of antibacterial properties showed that the antibacterial activity of the nanocomposites was improved compared to the nanoparticles alone, which indicated that the synergistic antibacterial effect existed between Ag and CeO. On the one hand, ICP-MS results showed that the existence of CeO suppressed the silver ion release rate and provided the composite with the ability of antibrowning; on the other, EPR data indicated that more hydroxyl radicals (·OH) were generated by the interfacial interaction between nanosized Ag and nanosized CeO. Hence, for the Ag-CeO composite antibacterial agent, hydroxyl radicals played an important role in causing bacterial death.
通过水热法获得的纳米银和氧化铈颗粒进行物理混合，以得到复合抗菌剂。抗菌性能的对比实验表明，与单独的纳米颗粒相比，纳米复合材料的抗菌活性有所提高，这表明银和氧化铈之间存在协同抗菌作用。一方面，电感耦合等离子体质谱（ICP-MS）结果表明，氧化铈的存在抑制了银离子的释放速率，并赋予复合材料抗褐变能力；另一方面，电子顺磁共振（EPR）数据表明，纳米银与纳米氧化铈之间的界面相互作用产生了更多的羟基自由基（·OH）。因此，对于银-氧化铈复合抗菌剂，羟基自由基在导致细菌死亡中起重要作用。
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