Journal
ACS BIOMATERIALS SCIENCE & ENGINEERING
Volume 8, Issue 2, Pages 560-569Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.1c01406
Keywords
lignin; photothermal; reactive oxygen species; biofilm; copper sulfide
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Funding
- National Key Research and Development Program of China [2018YFB1501503]
- National Natural Science Foundation of China [22038004, 21878114]
- Natural Science Foundation of Guangdong Province of China [2018B030311052]
- Key-Area Research and Development Program of Guangdong Province [2020B1111380002]
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This study addresses the challenges of antibiotic-resistant bacteria and biofilms by fabricating a LS-CuS@PVA composite hydrogel. The LS-CuS@PVA hydrogel exhibits excellent antibacterial and antibiofilm activity under near-infrared light irradiation, attributed to the synergistic effects of photothermal and photodynamic effects, as well as reactive oxygen species.
Antibiotic-resistant bacteria and biofilms are among the most difficult challenges in infection treatment. Herein, lignin-copper sulfide (LS-CuS) nanocomposites were incorporated into a poly(vinyl alcohol) (PVA) hydrogel to fabricate a LS-CuS@PVA composite hydrogel with near-infrared-activated photothermal, photodynamic, and peroxidase-like performance. The antibacterial tests of LS-CuS@PVA exhibited the highest antibacterial rate that caused 3.8-log and 4.8-log reductions of colony forming units (CFUs) against Escherichia coli and Staphylococcus aureus in the presence of H2O2 under near-infrared (NIR) light irradiation for 10 min. The significantly improved bactericidal performance could be attributed to the synergistic effects of hyperthermia and reactive oxygen species (ROS). Furthermore, the LS-CuS@PVA hydrogel could eradicate the already formed biofilm and inhibit biofilm formation. Considering the highly effective antibacterial and antibiofilm activity of the LS-CuS@PVA hydrogel, this work could provide new insights for the design of poly(vinyl alcohol)-based composite hydrogels for wound healing and wound dressing.
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