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Microcantilever sensing and actuation with end-grafted stimulus-responsive elastin-like polypeptides.
Alexei Valiaev1, Nehal I Abu-Lail, Dong Woo Lim
1Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 28, 2006
Summary
Surface-grafted elastin-like polypeptides (ELPs) show tunable properties for sensing. Changes in pH and ionic strength alter ELP conformation, leading to detectable microcantilever deflection for biosensing applications.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Nanotechnology
Background:
- Stimulus-responsive elastin-like polypeptides (ELPs) are polymers with tunable properties.
- Grafting ELPs onto surfaces enables applications in force generation, sensing, and molecular switching.
- Conformational changes in ELPs induce surface stress, detectable via microcantilever deflection.
Purpose of the Study:
- To investigate the conformational mechanics of surface-grafted ELPs.
- To explore the response of ELPs to changes in solution pH and ionic strength.
- To evaluate ELPs for cantilever actuation and sensing applications.
Main Methods:
- Atomic Force Microscopy (AFM) microcantilever deflection measurements.
- Quartz Crystal Microbalance (QCM) measurements.
- Utilizing genetically encoded, surface-grafted ELPs.
Main Results:
- ELP conformational changes were observed in response to varying pH and ionic strength.
- Microcantilever deflection correlated with ELP conformational state changes.
- Demonstrated the potential of ELPs for detecting changes in solvent type, temperature, and pH.
Conclusions:
- Surface-grafted ELPs are effective for microcantilever actuation and sensing.
- Microfabricated cantilevers provide a nonintrusive method for detecting ELP-based environmental changes.
- ELPs hold significant promise for sensing applications in microfluidic devices.
