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Convenient method for modifying poly(dimethylsiloxane) with poly(ethylene glycol) in microfluidics.

Jianhua Zhou1, Hui Yan, Kangning Ren

  • 1Department of Chemistry, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Analytical Chemistry
|July 16, 2009
PubMed
Summary

This study presents a simple method to covalently attach poly(ethylene glycol) (PEG) to poly(dimethylsiloxane) (PDMS) surfaces. This modification effectively suppresses protein adsorption, improving material performance in biological applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biomaterials Engineering

Background:

  • Poly(dimethylsiloxane) (PDMS) is widely used in microfluidics and biomedical devices.
  • Nonspecific protein adsorption onto PDMS surfaces can compromise device function and lead to inaccurate results.
  • Covalent modification strategies are needed to create protein-resistant PDMS surfaces.

Purpose of the Study:

  • To develop a convenient and reproducible method for covalently modifying PDMS with poly(ethylene glycol) (PEG) chains.
  • To enhance the protein resistance of PDMS surfaces.
  • To elucidate the molecular mechanism behind the observed surface properties.

Main Methods:

  • Incorporation of vinyl-terminated PEG additives into PDMS prepolymer.
  • Thermal curing of PDMS to induce covalent linkage of PEG via reaction with silane groups.
  • Surface characterization using Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and contact angle measurements.
  • Evaluation of protein adsorption resistance using bovine serum albumin (BSA) in capillary electrophoresis applications.

Main Results:

  • Successful covalent attachment of PEG chains to the PDMS network.
  • Demonstrated reduction in nonspecific protein adsorption on modified PDMS surfaces.
  • Characterization confirmed successful surface modification and altered surface properties.
  • The modified PDMS showed improved performance in on-chip capillary electrophoresis.

Conclusions:

  • A facile and effective method for creating protein-resistant PDMS surfaces via covalent PEGylation has been established.
  • The covalent PEG-PDMS modification significantly suppresses nonspecific protein adsorption.
  • The developed method offers a promising approach for fabricating advanced biomaterials and microfluidic devices with enhanced biocompatibility.