Abstract
The bacterial infection has a significant impact on the human health. With the widespread use of antibiotics, the bacterial resistance has increased significantly, which necessitates the urgent identification of novel antibacterial materials. In this study, a hydrogel with an inherent antibacterial ability, self-assembled from a heterochiral peptide C16-DL4LR4, has been reported. The hydrogel demonstrated optimal rheological and injectable properties. It revealed a time-dependent antibacterial activity against Gram-positive Staphylococcus aureus and Bacillus subtilis as well as Gram-negative Escherichia coli and Shigella sonnei. After 5 h treatment with the hydrogel, the survival rate of S. aureus, B. subtilis, E. coli and Sh. sonnei bacteria was decreased to 5.9%, 0%, 5.3% and 11.09%, respectively. The chiral nanofibers with a diameter of 15–20 nm in the hydrogel were observed to be conducive to the aggregation of bacteria and destruction of the cell membrane to achieve the antibacterial effect. In addition, the in vitro analysis on the mouse embryonic fibroblasts confirmed the superior biocompatibility of the hydrogel. The results obtained in this study provide the basis for the development of the functional antibacterial hydrogels by the self-assembly of the heterochiral peptides.
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Acknowledgements
This work was supported by Scientific Research Plan Project of Tianjin Municipal Education Commission (Nos. 2018KJ121).
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Scientific Research Plan Project of Tianjin Municipal Education Commission,2018KJ121,Yan-Yan Xie
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Xie, YY., Wang, XQ., Sun, MY. et al. Heterochiral peptide-based biocompatible and injectable supramolecular hydrogel with antibacterial activity. J Mater Sci 57, 5198–5209 (2022). https://doi.org/10.1007/s10853-022-06982-7
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DOI: https://doi.org/10.1007/s10853-022-06982-7