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Uncoupling bacterial attachment on and detachment from polydimethylsiloxane surfaces through empirical and simulation
Fei Pan1, Mengdi Liu2, Stefanie Altenried1
1Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland.
Journal of Colloid and Interface Science
|May 7, 2022
Summary
Surface chemistry, not material stiffness, dictates bacterial detachment from medical devices. Understanding these interactions aids in preventing device-related infections and projecting bacterial colonization on surfaces.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Microbiology
Background:
- Bacterial infections linked to medical devices pose significant health risks.
- Effective prevention strategies necessitate a deep understanding of bacteria-surface interactions.
Purpose of the Study:
- To investigate how surface physicochemical properties influence bacterial attachment and detachment under flow conditions.
- To differentiate the roles of surface chemistry and material mechanics in bacterial adhesion and removal.
Main Methods:
- Utilized polydimethylsiloxane (PDMS) substrates with varying crosslinking densities.
- Employed empirical studies combined with simulations using the extended Derjaguin–Landau–Verwey–Overbeek (DLVO) model.
- Analyzed bacterial detachment from PDMS substrates after removal of non-crosslinked polymer chains.
Main Results:
- Similar bacterial attachment was observed across PDMS substrates with different crosslinking degrees, consistent with simulated identical energy barriers.
- Significant differences in residual bacteria after detachment were observed, indicating detachment is governed by interfacial physicochemistry.
- Experiments with extracted PDMS substrates confirmed that surface chemistry, not bulk mechanical properties, determines bacterial detachment.
Conclusions:
- Bacterial detachment from surfaces is primarily dictated by interfacial physicochemical properties rather than the bulk mechanical characteristics of the material.
- This research provides crucial insights for predicting bacterial colonization on medical device surfaces.
- Findings can inform the design of materials and surfaces to mitigate device-associated bacterial infections.
