Reactive oxygen species (ROS)-induced
nanosystems represent one
of the most essential, efficient, and encouraging nanobactericides
for eliminating bacterial infection concerning the increasing resistance
threats of existing antibiotics. Among them, Fenton-type metal peroxide
nanoparticles are exciting nanomaterials with intriguing physiochemical
properties, yet the study of this antimicrobial agent is still in
its infancy. Herein, a robust pH-responsive Fenton nanosystem is constructed
by the assembly of copper peroxide nanodots in pomegranate-like mesoporous
silica nanoshells (CuO2@SiO2) that are capable
of self-supplying H2O2 and sustainably generating
O2. The enhanced antimicrobial performance is attributed
to the pH responsiveness and excellent Fenton catalytic activity through
either the Cu2+-catalyzed conversion of H2O2 to detrimental ROS under acid treatment or in situ O2 evolution in neutral media. Moreover, in vitro and in vivo
investigations demonstrate that this nanocomposite can exhibit boosted
antimicrobial capabilities and can significantly accelerate skin wound
closure, while retaining outstanding cytocompatibility and hemocompatibility.
Given its excellent physicochemical and antimicrobial properties,
the broad application of this nanocomposite in bacteria-associated
wound management is anticipated.
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