Abstract
Hydrogels, comprising 3D hydrophilic polymer networks, have emerged as promising biomaterial candidates for emulating the structure of biological tissues and delivering drugs through topical administration with good biocompatibility. Nanozymes can catalyze endogenous biomolecules, thereby initiating or inhibiting in vivo biological processes. A nanozyme-hydrogel composite inherits the biological functions of hydrogels and nanozymes, where the nanozyme serves as the catalytic core and the hydrogel forms the structural scaffold. Moreover, the composite can concentrate nanozymes in targeted lesions and catalyze the binding of a specific group of substrates, resulting in pathological microenvironment remodeling and drug-penetrating barrier impairment. The composite also shields nanozymes to prevent burst release during catalytic production and reduce related toxicity. Currently, the application of these composites has been extended to antibacterial, anti-inflammatory, anticancer, and tissue repair applications. In this review, we elucidate the preparation methods for nanozyme-hydrogel composites, provide compelling evidence of their advantages in drug delivery and provide a comprehensive overview of their biological application.
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