Superwetting comonomers reduce adhesion of E. coli BL21

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Microbiology

Background:

• Bacterial adhesion to biomaterials is a significant challenge in medical applications.
• Understanding the surface properties that influence bacterial adhesion is crucial for developing anti-fouling materials.

Purpose of the Study:

• To investigate the effect of trisiloxane-polyether acrylate surfactant concentration on Escherichia coli adhesion to methacrylate copolymers.
• To identify the key factors governing bacterial adhesion to these modified polymer surfaces.

Main Methods:

• Synthesis of methacrylate copolymers with varying fractions of a trisiloxane-polyether acrylate surfactant.
• Quantification of Escherichia coli adhesion to the synthesized copolymers.
• Analysis of surface properties including wettability, hardness, and water uptake.
• Investigation of the interaction between bound surfactant and bacterial surface domains.

Main Results:

• Copolymers with a low (20%) fraction of the surfactant monomer exhibited minimum Escherichia coli adhesion.
• Bacterial adhesion was not primarily correlated with wettability, hardness, or water uptake.
• Low concentrations of bound surfactant were identified as the limiting factor, interacting with hydrophobic bacterial domains and inhibiting surface anchoring.

Conclusions:

• Surface-bound surfactant, even at low concentrations, plays a critical role in modulating bacterial adhesion to methacrylate copolymers.
• The interaction between surfactant and bacterial hydrophobic domains is a key mechanism controlling adhesion, rather than bulk material properties.
• These findings offer insights for designing advanced biomaterials with reduced bacterial colonization.