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Related Experiment Videos

Surface molecular imprinting by atom transfer radical polymerization.

Xiaolin Wei1, Xiao Li, Scott M Husson

  • 1Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634-0909, USA.

Biomacromolecules
|March 15, 2005
PubMed
Summary
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Researchers successfully created ultrathin molecularly imprinted polymer (MIP) films on gold surfaces using atom transfer radical polymerization (ATRP). These MIP films show enhanced binding capacity for template molecules compared to nonimprinted polymers.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Molecularly imprinted polymers (MIPs) are synthetic receptors with tailored binding sites.
  • Surface-confined MIPs offer advantages for sensing and separation applications.
  • Atom Transfer Radical Polymerization (ATRP) enables controlled polymer synthesis.

Purpose of the Study:

  • To prepare ultrathin, surface-confined MIP films on gold substrates.
  • To investigate the binding capacity and selectivity of MIPs for specific template molecules.
  • To evaluate the efficiency of template removal from the MIP films.

Main Methods:

  • Atom Transfer Radical Polymerization (ATRP) for film synthesis.
  • Use of 2-Vinylpyridine (2Vpy) as functional monomer and Ethylene Glycol Dimethacrylate (EGDMA) as cross-linker.

Related Experiment Videos

  • Fluorescently labeled N,N'-didansyl-L-cystine and N,N'-didansyl-L-lysine as template molecules.
  • Spectroscopic and ellipsometric techniques for film characterization.
  • Fluorescence spectroscopy for adsorption capacity and selectivity studies.

    • Main Results:

    • Successful preparation of ultrathin (< 10 nm) MIP films on gold.
    • MIP films demonstrated significantly higher binding capacities than nonimprinted polymer (NIP) films.
    • Template removal was found to be 100% efficient.
    • MIPs exhibited selectivity for their respective templates, with selectivity coefficients of 1.13 and 1.51 for N,N'-didansyl-L-lysine and N,N'-didansyl-L-cystine, respectively.
    • Some cross-reactivity between the two template molecules was observed.

    Conclusions:

    • Ultrathin, surface-confined MIPs can be effectively prepared using ATRP on gold substrates.
    • These MIP films show promising potential for selective molecular recognition and binding applications.
    • The developed MIPs offer efficient template binding and removal, suitable for sensor development.