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Journal for Biophysical Chemistry

Biointerphases Cover Image
  • Open Access

Surface plasmon optical study of the interfacial phase transition of elastinlike polypeptide grafted on gold

  • 1,
  • 1,
  • 2,
  • 2 and
  • 1, 3

  • Received: 14 May 2008
  • Accepted: 7 July 2008
  • Published:


The conformational changes in elastinlike polypeptides (ELPs) grafted to a solid/solution interface via different architectures were studied using surface plasmon resonance spectroscopy and surface plasmon field-enhanced fluorescence spectroscopy (SPFS). SPFS provides a simple and convenient optical method to study the influence of the grafting method and the graft density on the conformational changes in ELPs at the solid-solution interface as a function of environmental variables. A typical response of the ELP, consistent with its stimuli responsiveness, was a gradual collapse upon increasing the ionic strength; this effect was inversely correlated with the surface graft density of the ELP.