基于正电荷和光热协同效应的新型半导体聚合物纳米抗菌材料

由于抗生素的不当使用和细菌多药耐药的出现, 迫切需要开发新的抗菌剂. 本文制备了具有光热转换性能的正电荷半导体高分子材料及具有协同抗菌活性的半导体聚合物纳米粒子(SP-PPh₃ NPs). SP-PPh₃ NPs的光热转化效率为43.8%. 带正电荷的SP-PPh₃ NPs可以附着在细菌上, 有助于将热量有效传递给细菌. 在热和正电荷的协同作用下, SP-PPh₃ NPs对革兰氏阴性大肠杆菌(E. coli)和革兰氏阳性金黄色葡萄球菌(S. aureus)均具有抗菌活性, 其对二者的体外抑菌率分别为99.9%和98.6%. 此外, SP-PPh₃ NPs具有良好的生物相容性, 对小鼠的主要器官几乎无副作用. 对细菌感染的小鼠皮肤伤口用SP-PPh₃ NPs治疗12 d后, 伤口可以很好地愈合.

New Semiconducting Polymer Nanoparticles for Antibacterial Agent by the Synergetic Effect of Positive Charge and Photothermal Conversion

Because of the abuse of antibiotics and the emergence of bacterial resistance,the new antibacterial agents are required urgently.Herein,we prepared semiconducting polymer nanoparticles(SP-PPh 3 NPs)with synergistic antibacterial activity due to photothermal properties and positive charge.SP-PPh 3 NPs have broad-spectrum antibacterial properties against Gram-negative Escherichia coli(E.coli)and Gram-positive Staphylococcus aureus(S.aureus).The photothermal conversion efficiency of SP-PPh 3 NPs is 43.8%.Moreover,the positive charge of SP-PPh 3 NPs can adhere to bacteria,which is helpful to transmit heat to bacteria effectively.Under the synergistic effect of heat and positive charge,the antibacterial rates of E.coli and S.aureus treated with SP-PPh 3 NPs are 99.9%and 98.6%in vitro,respectively.In addition,SP-PPh 3 NPs have good biocompatibility and have almost no side effects on the major organs of mice.The bacteria-infected skin wounds on mice can completely heal after 12 d treated with SP-PPh 3 NPs.