| Title | Dialdehyde cellulose films covalently crosslinked with porphyrin-based covalent organic polymers for photodynamic sterilization |
|---|---|
| ID_Doc | 16124 |
| Authors | Fu, QB; Li, HS; An, MZ; Sun, X; Zhang, SK; Zhang, TT; Yang, WJ; Li, YJ; Waterhouse, GIN; Liu, XA; Ai, SY |
| Title | Dialdehyde cellulose films covalently crosslinked with porphyrin-based covalent organic polymers for photodynamic sterilization |
| Year | 2024 |
| Published | |
| Abstract | Foodborne pathogens result in a great harm to human, which is an urgent problem to be addressed. Herein, a novel cellulose -based packaging films with excellent anti -bacterial properties under visible light were prepared. A porphyrin-based covalent organic polymer (Por-COPs) was constructed, then covalently grafted onto dialdehyde cellulose (DAC). The addition of Por-COPs enhanced the mechanical, hydrophobicity, and water resistance of the DAC-based composite films. DAC/Por-COP-2.5 film exhibited outstanding properties for the photodynamic inactivation of bacteria under visible light irradiation, delivering inactivation efficiencies of 99.90 % and 99.45 % towards Staphylococcus aureus and Escherichia coli within 20 min. The DAC/Por-COPs films efficiently generated center dot O-2(-) and O-1(2) under visible light, thereby causing oxidative stress to cell membranes for bacterial inactivation. The prepared composite film forms a protective barrier against bacterial contamination. Results guide the development of high performance and more sustainable packaging films for the food sector. |
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