协同杀菌作用:基于石墨烯氧化物/银/胶原蛋白涂层的光动力和物理联合作用。

Synergistic Bacteria Killing through Photodynamic and Physical Actions of Graphene Oxide/Ag/Collagen Coating.

机构信息

Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University , Wuhan 430062, China.

School of Materials Science & Engineering, Tianjin University , Tianjin 300072, China.

出版信息

ACS Appl Mater Interfaces. 2017 Aug 9;9(31):26417-26428. doi: 10.1021/acsami.7b06702. Epub 2017 Jul 28.

Abstract

Researchers have widely agreed that the broad spectrum antibacterial activity of silver nanoparticles (AgNPs) can be predominantly ascribed to the action of Ag. This study marks the first report detailing the rapid and highly efficient synergistic bacteria killing of AgNPs, which is achieved by inspiring AgNPs' strong photocatalytic capability to rapidly produce radical oxygen species using 660 nm visible light together with the innate antimicrobial ability of Ag. These AgNPs were uniformly distributed into well-defined graphene oxide (GO) nanosheets through an in situ reduction of Ag and subsequently wrapped with a thin layer of type I collagen. In vivo subcutaneous tests demonstrated that 20 min irradiation of 660 nm visible light could achieve a high antibacterial efficacy of 96.3% and 99.4% on the implant surface against Escherichia coli and Staphylococcus aureus, respectively. In addition, the collagen could reduce the coatings' possible cytotoxicity. The results of this work can provide a highly effective and universal GO-based bioplatform for combination with inorganic antimicrobial NPs (i.e., AgNPs) with excellent photocatalytic properties, which can be utilized for facile and rapid in situ disinfection, as well as long-term prevention of bacterial infection through the synergistic bacteria killing of both 660-nm light-inspired photodynamic action and their innate physical antimicrobial ability.

摘要

研究人员普遍认为,银纳米粒子(AgNPs)的广谱抗菌活性主要归因于 Ag 的作用。本研究首次详细报告了 AgNPs 的快速高效协同杀菌作用,这是通过激发 AgNPs 的强光催化能力,利用 660nm 可见光快速产生自由基氧物种,同时利用 Ag 的固有抗菌能力来实现的。这些 AgNPs 通过 Ag 的原位还原均匀分布在定义明确的氧化石墨烯(GO)纳米片上,随后用一层薄的 I 型胶原蛋白包裹。体内皮下试验表明,660nm 可见光照射 20min 即可分别实现对植入物表面大肠杆菌和金黄色葡萄球菌的高效抗菌效果,分别达到 96.3%和 99.4%。此外,胶原蛋白可以降低涂层的可能细胞毒性。这项工作的结果可以为具有优异光催化性能的无机抗菌 NPs(即 AgNPs)提供一种高效通用的 GO 基生物平台,可通过 660nm 光激发的光动力作用和固有物理抗菌能力的协同杀菌作用,实现简便快速的原位消毒以及长期预防细菌感染。

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