Biomedical Microdevices

, Volume 13, Issue 4, pp 671–682

Lipid bilayer coated Al2O3 nanopore sensors: towards a hybrid biological solid-state nanopore

Authors

  • Bala Murali Venkatesan
    • Department of Electrical and Computer EngineeringUniversity of Illinois at Urbana Champaign
    • Micro and Nanotechnology LaboratoryUniversity of Illinois at Urbana Champaign
  • James Polans
    • Department of Electrical and Computer EngineeringUniversity of Illinois at Urbana Champaign
    • Micro and Nanotechnology LaboratoryUniversity of Illinois at Urbana Champaign
  • Jeffrey Comer
    • Department of PhysicsUniversity of Illinois at Urbana Champaign
    • Beckman InstituteUniversity of Illinois at Urbana Champaign
  • Supriya Sridhar
    • Department of Electrical and Computer EngineeringUniversity of Illinois at Urbana Champaign
    • Micro and Nanotechnology LaboratoryUniversity of Illinois at Urbana Champaign
  • David Wendell
    • College of MedicineUniversity of Cincinnati
    • College of EngineeringUniversity of Cincinnati
  • Aleksei Aksimentiev
    • Department of PhysicsUniversity of Illinois at Urbana Champaign
    • Beckman InstituteUniversity of Illinois at Urbana Champaign
    • Department of Electrical and Computer EngineeringUniversity of Illinois at Urbana Champaign
    • Micro and Nanotechnology LaboratoryUniversity of Illinois at Urbana Champaign
    • Department of PhysicsUniversity of Illinois at Urbana Champaign
    • Department of BioengineeringUniversity of Illinois at Urbana Champaign
Article

DOI: 10.1007/s10544-011-9537-3

Cite this article as:
Venkatesan, B.M., Polans, J., Comer, J. et al. Biomed Microdevices (2011) 13: 671. doi:10.1007/s10544-011-9537-3

Abstract

Solid-state nanopore sensors are highly versatile platforms for the rapid, label-free electrical detection and analysis of single molecules, applicable to next generation DNA sequencing. The versatility of this technology allows for both large scale device integration and interfacing with biological systems. Here we report on the development of a hybrid biological solid-state nanopore platform that incorporates a highly mobile lipid bilayer on a single solid-state Al2O3 nanopore sensor, for the potential reconstitution of ion channels and biological nanopores. Such a system seeks to combine the superior electrical, thermal, and mechanical stability of Al2O3 solid-state nanopores with the chemical specificity of biological nanopores. Bilayers on Al2O3 exhibit higher diffusivity than those formed on TiO2 and SiO2 substrates, attributed to the presence of a thick hydration layer on Al2O3, a key requirement to preserving the biological functionality of reconstituted membrane proteins. Molecular dynamics simulations demonstrate that the electrostatic repulsion between the dipole of the DOPC headgroup and the positively charged Al2O3 surface may be responsible for the enhanced thickness of this hydration layer. Lipid bilayer coated Al2O3 nanopore sensors exhibit excellent electrical properties and enhanced mechanical stability (GΩ seals for over 50 h), making this technology ideal for use in ion channel electrophysiology, the screening of ion channel active drugs and future integration with biological nanopores such as α-hemolysin and MspA for rapid single molecule DNA sequencing. This technology can find broad application in bio-nanotechnology.

Keywords

NanoporeAl2O3Lipid bilayerHybrid biological solid-state Nanopore

Supplementary material

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Copyright information

© Springer Science+Business Media, LLC 2011