Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 22, Pages 25042-25049Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c00434
Keywords
nanozymes; CuxO-PDA; NIR irradiation; peroxidase-mimicking activity; antibacterial effect
Funding
- National Natural Science Foundation of China [22174047, 22074043]
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In this study, a multifunctional nanozyme, CuxO-PDA, was designed to enhance the antibacterial effect. CuxO-PDA showed enhanced catalytic activity under near-infrared irradiation, and had the ability to target bacteria and trap them together.
Bacterial infection is still a thorny problem threatening human health, and nanozymes offer a promising alternative strategy to combat the health threat posed by bacterial infection. However, the antibacterial efficacies of nanozymes are unsatisfactory because of low catalytic activity of nanozymes and their inability to trap bacteria. Herein, a multifunctional nanozyme, polydopamine (PDA)-modified copper oxide (CuxO-PDA) is designed to overcome this challenge. CuxO-PDA showed peroxidase-mimicking activity and the catalytic activity was enhanced upon near-infrared (NIR) irradiation. CuxO-PDA was negatively charged under neutral or alkaline condition and showed no obvious peroxidase-mimicking activity. On the contrary, the surface charge of CuxO-PDA can be switched to positive under acidic conditions, which can target negatively charged bacteria. More interestingly, well-dispersed CuxO-PDA can aggregate rapidly under NIR irradiation, which trapped the bacteria and nanozymes together. It was found that shortening the distance between nanozyme and bacteria could improve the antibacterial effect. The obtained CuxO-PDA can cause DNA degradation, lipid peroxidation, and biofilm eradication. CuxO-PDA showed good antibacterial effect against two kinds of representative bacteria, Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive). The experiment in vivo further proved favorable antibacterial activity of CuxO-PDA nanozyme.
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