Issue 42, 2023

A nanozyme-reinforced injectable photodynamic hydrogel for combating biofilm infection

Abstract

Bacterial biofilm-associated infectious diseases remain serious menaces to human health. Recently, photodynamic therapy (PDT) has become a prospective strategy for combating biofilm infection. However, anaerobic conditions in a biofilm greatly inhibit its therapeutic efficacy. Here, a nanozyme-reinforced injectable hydrogel is prepared using Ca2+-crosslinked sodium alginate incorporated with photosensitizer-loaded MnO2 nanosheets and CaO2 nanoparticles for O2 self-sufficient PDT to eradicate biofilm infection. In our design, CaO2 reacts with water to produce locally concentrated H2O2, which could be catalyzed by MnO2 nanosheets (catalase-mimic nanozymes) to generate O2 and greatly relieve the hypoxic conditions in the biofilm, thus significantly strengthening PDT efficacy. In vitro assays confirmed that the hybrid hydrogel not only exhibits high-performance bactericidal activity in combating both Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli but also shows great efficacy in eliminating biofilm infection. Moreover, benefiting from its good syringeability, the hybrid hydrogel is prone to fit irregular wounds and exhibits high efficiency in promoting wound healing in a biofilm-infected mice model. Besides, no obvious toxicity is detected in the hybrid hydrogel. Overall, we envision that our designed hydrogel could provide a prospective solution for combating biofilm-associated infections.

Graphical abstract: A nanozyme-reinforced injectable photodynamic hydrogel for combating biofilm infection

Supplementary files

Article information

Article type
Paper
Submitted
27 jul 2023
Accepted
04 out 2023
First published
04 out 2023

J. Mater. Chem. B, 2023,11, 10108-10120

A nanozyme-reinforced injectable photodynamic hydrogel for combating biofilm infection

J. Zhang, S. Zhao, S. Zhang, H. Zhu, Y. Zhang, L. Li, C. Liu and J. Shi, J. Mater. Chem. B, 2023, 11, 10108 DOI: 10.1039/D3TB01688A

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