Effective Antibacterial Activity of Degradable Copper-Doped Phosphate-Based Glass Nanozymes

Abstract

Copper-containing antimicrobials are highly valuable in the field of medical disinfectants owing to their well-known high antimicrobial efficacy. Artificially synthesized nanozymes which can increase the level of reactive oxygen species (ROS) in the bacterial system have become research hotspots. Herein, we describe the design and fabrication of degradable Cu-doped phosphate-based glass (Cu-PBG) nanozyme, which can achieve excellent antibacterial effects against Gram-positive and Gram-negative bacteria. The antibacterial mechanism is based on the generation of ROS storm and the release of copper. It behaves like a peroxidase in wounds which are acidic and exerts lethal oxidative stress on bacteria via catalyzing the decomposition of H2O2 into hydroxyl radicals (•OH). Quite different from any other reported nanozymes, the Cu-PBG is intrinsically degradable due to its phosphate glass nature. It gradually degrades and releases copper ions in a physiological environment, which further enhances the inhibition efficiency. Satisfactory antibacterial effects are verified both in vitro and in vivo. Being biodegradable, the prepared Cu-PBG exhibits excellent in vivo biocompatibility and does not cause any adverse effects caused by its long-time residence time in living organisms. Collectively, these results indicate that the Cu-PBG nanozyme could be used as an efficient copper-containing antimicrobial with great potential for clinical translation.

Selective strategies for antibacterial regulation of nanomaterials

“…3 ). 54 Different from silver and copper, gold does not readily dissociate into ions due to its higher inertness and stability. 55 It is necessary to endow AuNPs with antibacterial activity by grafting some compounds on their surface.…”

The Effects of Natural Products and Environmental Conditions on Antimicrobial Resistance

“…Similarly, degradable Cu-doped phosphate-based glass (Cu-PBG) nanozyme has an effective antibacterial activity against Gram-positive and Gram-negative bacteria both in vitro and in vivo, by increasing the level of ROSs and releasing copper [99].…”

“…One of them is AGXX ® —which is composed of two transition metals, silver and ruthenium—causes an oxidative and metal stress response as well as strong protein damage to kill MRSA [ 16 ]. Similarly, degradable Cu-doped phosphate-based glass (Cu-PBG) nanozyme has an effective antibacterial activity against Gram-positive and Gram-negative bacteria both in vitro and in vivo, by increasing the level of ROSs and releasing copper [ 99 ].…”

Cross‐Linked but Self‐Healing and Entirely Degradable Poly‐Schiff Base Metal Complex Materials for Potential Anti‐Biofouling

“…On the one hand, some metal ions with anti-biofouling capabilities, such as Cu 2+ and Ag + , are also released into the water system along with the degradation of PSB polymer, which can effectively enhance the anti-biofouling performance. [27,28] On the other hand, the regulation of metal ions is a feasible method to control the mechanical properties and degradation properties of the material. 2) Degradation causes change in the chemical composition of the material interface.…”