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Updated: Jun 14, 2025
High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
Published on: November 5, 2016
Guanidine-modified polysaccharide conditioning layer designed for regulating bacterial attachment behaviors
Jianxin Wen1, Xiaomei Liu2, Zhuoyue Han2
1Zhejiang-Japan Joint Laboratory for Antibacterial and Antifouling Technology, Zhejiang Engineering Research Center for Biomedical Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
A new guanidine-modified polysaccharide conditioning layer effectively combats biofouling by disrupting bacterial cell membranes. This innovative coating significantly reduces bacterial survival on surfaces, offering a promising solution for long-term applications.
Area of Science:
- Materials Science
- Biotechnology
- Environmental Science
Background:
- Biofouling is a persistent global challenge, primarily driven by bacterial attachment and biofilm formation on material surfaces.
- Conditioning layers of organic macromolecules significantly influence bacterial adhesion by altering surface physicochemical properties.
Purpose of the Study:
- To construct and characterize a novel guanidine-modified polysaccharide conditioning layer.
- To investigate the layer's capability in tuning bacterial attachment and combating biofouling.
Main Methods:
- Dextran was oxidized and modified with polyhexamethylene guanidine hydrochloride (PHMG) via Schiff base reaction to create the guanidine-based dextran conditioning layer.
- Atomic Force Microscopy (AFM) was used to characterize morphological changes.
- Bacterial attachment and survival assays were performed using Pseudomonas aeruginosa and Staphylococcus aureus.
Main Results:
- PHMG modification altered the conditioning layer morphology from a tangled chain to an island conformation.
- The guanidine-based layer promoted bacterial attachment but caused significant disruption of bacterial cytomembranes due to electrostatic interactions.
- Survival ratios for P. aeruginosa and S. aureus were reduced to 22–34% and 1–4%, respectively, after 72 hours.
Conclusions:
- The developed guanidine-based dextran conditioning layer demonstrates potent antibacterial activity by disrupting bacterial membranes.
- This study provides insights into the application of modified polysaccharides for effective biofouling control.
