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A polycationic antimicrobial and biocompatible hydrogel with microbe membrane suctioning ability

Nature Materials volume 10, pages 149–156 (2011)Cite this article

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Abstract

Despite advanced sterilization and aseptic techniques, infections associated with medical implants have not been eradicated. Most present coatings cannot simultaneously fulfil the requirements of antibacterial and antifungal activity as well as biocompatibility and reusability. Here, we report an antimicrobial hydrogel based on dimethyldecylammonium chitosan (with high quaternization)-graft-poly(ethylene glycol) methacrylate (DMDC-Q-g-EM) and poly(ethylene glycol) diacrylate, which has excellent antimicrobial efficacy against Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus and Fusarium solani. The proposed mechanism of the antimicrobial activity of the polycationic hydrogel is by attraction of sections of anionic microbial membrane into the internal nanopores of the hydrogel, like an ‘anion sponge’, leading to microbial membrane disruption and then microbe death. We have also demonstrated a thin uniform adherent coating of the hydrogel by simple ultraviolet immobilization. An animal study shows that DMDC-Q-g-EM hydrogel coating is biocompatible with rabbit conjunctiva and has no toxicity to the epithelial cells or the underlying stroma.

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Figure 1: qC-g-EM polymers and the antimicrobial killing mechanism of their hydrogels.
Figure 2: Antimicrobial activities of qC-g-EM hydrogels against various bacteria and fungi.
Figure 3: Coating of DMDC-Q-g-EM hydrogel on fluoropolymer substrate.
Figure 4: In vitro and in vivo biocompatibility studies.

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Acknowledgements

This work was funded and supported by Menicon Holdings (Japan), a Singapore Ministry of Education Tier 2 grant (M45120007), Nanyang Technological University (Singapore) and a Singapore SingHealth Foundation grant (SHF/09/GMC(1)/012(R) (R705)). R.W.B. and H-Y.Z. were supported by NMRC/TCR/002-SERI/2008 R618. Y.C. was supported by SingHealth Foundation SHF/09/GMC(1)/012(R) (R705). W.L. and Y.M. were supported by a Singapore Ministry of Education Tier 2 grant (T206B3210RS). We acknowledge the Singapore General Hospital (Pathology Department) for carrying out some of the early antimicrobial tests. We thank Y. Shucong, W. Xiujuan and F. Ning for their help in using field emission scanning electron microscopy, scanning electron microscopy and atomic force microscopy. The provision of computation time from the NTU HPC centre is gratefully acknowledged.

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Author notes

  1. Peng Li and Yin Fun Poon: These two authors contributed equally to the paper

Authors and Affiliations

  1. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore

    Peng Li, Yin Fun Poon, Siew Hooi Yeap, Ye Cao, Xiaobao Qi, Chuncai Zhou, Chang Ming Li, Matthew W. Chang, Susanna Su Jan Leong & Mary B. Chan-Park

  2. School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore

    Weifeng Li

  3. Singapore Eye Research Institute, 11 Third Hospital Avenue, Singapore 168751, Singapore

    Hong-Yuan Zhu & Roger W. Beuerman

  4. Menicon Co. Ltd., Immeuble Espace Cordelier, 2 Président Carnot, Lyon 69002, France

    Mouad Lamrani

  5. Duke-NUS, SRP Neuroscience and Behavioral Disorders, 8 College Road, Singapore 169857, Singapore

    Roger W. Beuerman

  6. Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge, Singapore 119260, Singapore

    En-Tang Kang

  7. School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore

    Yuguang Mu

Authors
  1. Peng Li
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Contributions

P.L. carried out the testing and coating experiments. Y.F.P., P.L. and S.H.Y. did the syntheses and characterization of all the polymers. Y.C. carried out the in vitro biocompatibility studies. X.Q. carried out some early antimicrobial testing. W.L. and Y.M. did the computer simulation and related writing. H-Y.Z. and R.W.B. did the animal study and related writing. C.Z., E-T.K., M.L., M.W.C., S.S.J.L., C.M.L. and M.B.C-P. advised on the design and interpretation of the experiments. M.B.C-P. directed the overall project. P.L., Y.F.P. and M.B.C-P. did the main writing of the manuscript.

Corresponding author

Correspondence to Mary B. Chan-Park.

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Competing interests

M.B.C-P. was the PI of this project funded by Menicon, which was directly interested in this product.

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Li, P., Poon, Y., Li, W. et al. A polycationic antimicrobial and biocompatible hydrogel with microbe membrane suctioning ability. Nature Mater 10, 149–156 (2011). https://doi.org/10.1038/nmat2915

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