Electrodeless QCM-D for lipid bilayer applications
Journal article, 2011

An electrodeless quartz crystal microbalance with dissipation monitoring (QCM-D) setup is used to monitor the formation of supported lipid bilayers (SLBs) on bare quartz crystal sensor surfaces. The kinetic behavior of the formation of a 1-palmitoyl-2-oleoyl-sn-glycero-3-Phosphocholine (POPC) SLB on SiO2 surfaces is discussed and compared for three cases: (i) a standard SiO2 film deposited onto the gold electrode of a quartz crystal, (ii) an electrodeless quartz crystal with a sputter-coated SiO2 film, and (iii) an uncoated electrodeless quartz crystal sensor surface. We demonstrate, supported by imaging the SLB on an uncoated electrodeless surface using atomic force microscopy (AFM), that a defect-free, completely covering bilayer is formed in all three cases. Differences in the kinetics of the SLB formation on the different sensor surfaces are attributed to differences in surface roughness. The latter assumption is supported by imaging the different surfaces using AFM. We show furthermore that electrodeless quartz crystal sensors can be used not only for the formation of neutral SLBs but also for positively and negatively charged SLBs. Based on our results we propose electrodeless QCM-D to be a valuable technique for lipid bilayer and related applications providing several advantages compared to electrode-coated surfaces like optical transparency, longer lifetime, and reduced costs.

SiO2

supported lipid bilayer

Electrodeless quartz crystal microbalance

surface roughness

atomic force microscopy

Author

Angelika Kunze

Chalmers, Applied Physics, Biological Physics

Michael Zäch

Chalmers, Applied Physics, Chemical Physics

Sofia Svedhem

Chalmers, Applied Physics, Biological Physics

Bengt Herbert Kasemo

Chalmers, Applied Physics, Chemical Physics

Biosensors and Bioelectronics

0956-5663 (ISSN)

Vol. 26 5 1833-1838

Areas of Advance

Nanoscience and Nanotechnology

Materials Science

Subject Categories

Atom and Molecular Physics and Optics

DOI

10.1016/j.bios.2010.01.018

More information

Created

10/6/2017