2D AuPd alloy nanosheets: one-step synthesis as imaging-guided photonic nano-antibiotics.

2D AuPd alloy nanosheets: one-step synthesis as imaging-guided photonic nano-antibiotics.
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二维 AuPd 合金纳米片:成像引导光子纳米抗生素的一步合成

DOI:
10.1039/d0na00342e
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发表时间:
2020-08-11
期刊:
影响因子:
4.7
通讯作者:
--
中科院分区:
材料科学3区
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纳米材料复杂的合成工艺和不良的生物相容性阻碍了光热/光动力协同治疗细菌感染。因此,我们开发了一种一步制备二维AuPd合金纳米片的方法,作为成像引导的光子纳米抗生素。二维AuPd合金纳米片具有非常小的厚度(约1.5 nm),表现出显著的光热效应(η = 76.6%)、优异的ROS生成、强的光声信号和良好的生物相容性。当使用808 nm激光以1 W cm−2照射5分钟时,AuPd纳米片可以消除100%的代表性革兰氏阳性菌(金黄色葡萄球菌)和革兰氏阴性菌(大肠杆菌)。在光声成像的引导下,利用细菌靶向肽修饰AuPd纳米片,对金黄色葡萄球菌感染的小鼠具有良好的光热/光动力协同治疗效果。这项工作将二维贵金属纳米材料的生物医学应用扩展到光子纳米抗生素领域。
The complicated synthesis and undesirable biocompatibility of nanomaterials hinder the synergistic photothermal/photodynamic therapy for bacterial infections. Herein, we develop a one-step preparation method of 2D AuPd alloy nanosheets as imaging-guided photonic nano-antibiotics. 2D AuPd alloy nanosheets with an extremely small thickness (∼1.5 nm) exhibit prominent photothermal effects (η = 76.6%), excellent ROS generation, strong photoacoustic signals and desirable biocompatibility. AuPd nanosheets can eliminate 100% of representative Gram-positive (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli) when irradiated using an 808 nm laser at 1 W cm−2 for 5 minutes. After being modified with a bacterial targeting peptide, under the guidance of photoacoustic imaging, AuPd nanosheets achieve promising synergistic photothermal/photodynamic therapeutic efficacy in treating Staphylococcus aureus infected mice. This work expands the biomedical application of 2D noble metal nanomaterials to the field of photonic nano-antibiotics.
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