Skin and soft tissue infection (SSTI) is an inflammatory condition caused by bacteria, and the eradication of biofilms is an important problem when treating such infections. Because of the low dispersibility and biofilm permeability of magnetic antibacterial materials, biofilm removal is difficult and infection persists. To solve these problems, inspired by conventional cloud bombs, a magnetic “nano‐cloud bomb” by adjusting the synthesis ratio to alter the shape of an assembled zeolitic imidazolate framework (ZIF), namely ZIF‐L‐Fe, is synthesized simply and rapidly. ZIF‐L‐Fe has a flower‐like clustered structure with sharp edges, which prevents the stacking of 2D ZIF nanoleaves, thereby enhancing the dispersion of Fe nanoparticles and increasing biofilm penetration under the action of magnetism. Additionally, ZIF‐L‐Fe retains the photothermal and catalytic properties of nanoparticles, which can kill methicillin‐resistant Staphylococcus aureus (MRSA) at low temperature and efficiently catalyze hydrogen peroxide (H2O2). Because of its magnetic effect, ZIF‐L‐Fe can rapidly penetrate biofilm, thus forming craters and destroying the local biofilm structure. Accordingly, the proposed strategy of clustered ZIF‐loaded delivery of Fe provides a novel concept that requires further development for clinical application to the treatment of biofilm infections.

Safe and effective biomaterials are in urgent clinical need for tissue regeneration and bone repair. While numerous advances have been made on hydrogels promoting osteogenesis in bone formation, co-stimulation of the angiogenic pathways in this process remains to be exploited. Here, we have developed a gelatin-based blue-light-curable hydrogel system, functionalized with an angiogenic vascular endothelial growth factor (VEGF) mimetic peptide, KLTWQELYQLKYKGI (KLT), and an osteoanabolic peptide, parathyroid hormone (PTH) 1–34. We have discovered that the covalent modification of gelatin scaffold with peptides can modulate the physical properties and biological activities of the produced hydrogels. Furthermore, we have demonstrated that those two peptides orchestrate synergistically and promote bone regeneration in a rat cranial bone defect model with remarkable efficacy. This dual-peptide-functionalized hydrogel system may serve as a promising lead to functional biomaterials in bone repair and tissue engineering.

Recently, single‐atom nanozymes have made significant progress in the fields of sterilization and treatment, but their catalytic performance as substitutes for natural enzymes and drugs are far from satisfactory. Here, we report a method to improve enzyme activity by adjusting the spatial position of a single‐atom site on the nanoplatforms. We synthesized two types of Cu single atom site nanozymes in the interlayer (CuL/PHI) and in‐plane (CuP/PHI) of poly (heptazine imide) (PHI) through different synthesis pathways. Experimental and theoretical analysis indicates that the interlayer position of PHI can effectively adjust the coordination number, coordination bond length, and electronic structure of Cu single atoms compared to the in‐plane position, thereby promoting photoinduced electron migration and O2 activation, enabling effective generate reactive oxygen species. Under visible light irradiation, the photocatalytic bactericidal activity of CuL/PHI against aureus was nearly 100%, achieving the same antibacterial effect as antibiotics, after 10 minutes of low‐dose light exposure and 2 hours of incubation.This article is protected by copyright. All rights reserved

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