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Biomimetic Materials to Characterize Bacteria-host Interactions
Published on: November 16, 2015
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Bacterial adhesion to polyvinylamine-modified nanocellulose films
Jonatan Henschen1, Per A Larsson1, Josefin Illergård1
1Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden.
Colloids and Surfaces. B, Biointerfaces
|December 26, 2016
Summary
Researchers explored bacterial adhesion on cellulose nanofibril (CNF) materials modified with polyelectrolyte multilayers. Tailoring surface charge and structure effectively controls bacterial interaction with CNF, enabling customized material properties for various applications.
Area of Science:
- Materials Science
- Biotechnology
- Surface Chemistry
Background:
- Cellulose nanofibril (CNF) materials are increasingly studied for applications in medical and hygiene products.
- Understanding and controlling bacterial adhesion to CNF materials is crucial for their safe and effective use.
- Limited research exists on the interaction between bacteria and modified CNF surfaces.
Purpose of the Study:
- To investigate how bacteria adhere to CNF materials modified with polyelectrolyte multilayers (PEMs).
- To determine the influence of CNF surface properties (charge, water interaction, structure) on PEM adsorption and bacterial adhesion.
- To demonstrate the potential for tailoring bacterial adhesion on CNF using PEMs.
Main Methods:
- CNF materials were modified via TEMPO-oxidation (surface charge), periodate-oxidation (water interaction), and hot-pressing (surface structure).
- Polyelectrolyte multilayers (PEMs) of polyvinylamine (PVAm) and polyacrylic acid (PAA) were constructed on CNF surfaces.
- Bacterial adhesion was quantified using microscopy after incubating samples with bacterial suspensions.
Main Results:
- Surface charge and water interaction significantly affected PEM adsorption; higher surface charge reduced adsorption after the first PVAm layer.
- Periodate-oxidized and crosslinked films showed low initial PEM adsorption due to reduced swelling.
- Bacterial adhesion was significantly reduced on CNF materials with lower surface charges and increased anionic surface charge from PEMs.
- Hot-pressing of CNF films substantially increased bacterial adhesion.
- Both the amount of PVAm and PAA in PEMs influenced net surface charge and bacterial adhesion.
Conclusions:
- Bacterial adhesion to CNF materials can be effectively controlled by modifying surface properties and applying polyelectrolyte multilayers.
- The study demonstrates a method for tailoring CNF materials to either promote or inhibit bacterial adhesion.
- These findings have implications for designing advanced CNF-based materials for specific biomedical and hygiene applications.
