Mechanically stable free-standing bilayer lipid membranes in microfabricated silicon chips

Azusa Oshima, Ayumi Hirano-Iwata, Yasuo Kimura, Michio Niwano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we will discuss our recent approaches for improving the mechanical stability of free-standing bilayer lipid membranes (BLMs) by combining with BLM formation and microfabrication techniques. BLMs were prepared across a microaperture fabricated in a silicon (Si) chip and their mechanical stability and electric properties were investigated. BLMs suspended in a thin Si 3N 4 septum showed a dramatic improvement of BLM stability. The BLMs were resistant to voltage of ±1 V and the membrane lifetime was 15- ∼40 h with and without incorporated channels. The membrane containing gramicidin channel exhibited tolerance to repetitive solution exchanges. At first, electric properties of the BLMs, such as noise level and current transient, were necessary to be improved. However, after coating the chip with insulator layers of Teflon and SiO 2, total chip capacitance was reduced, leading to noise reduction (1-2 pA in peak-to-peak after low-pass filtering at 1 kHz) and elimination of current transients (< 0.5 ms). Since the vicinity of the aperture edge was remained uncoated, the BLMs formed in the Si chips still showed high mechanical stability after the insulator coatings. The mechanically stable BLMs having electric properties suitable for recording activities of biological channels will open up a variety of applications including high-throughput analysis of ion-channel proteins.

Original languageEnglish
Title of host publicationMEMS, BioMEMS and Bioelectronics - Materials and Devices
Pages93-98
Number of pages6
DOIs
Publication statusPublished - 2012
Event2011 MRS Fall Meeting - Boston, MA, United States
Duration: 2011 Nov 282012 Dec 2

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1415
ISSN (Print)0272-9172

Other

Other2011 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/11/2812/12/2

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Mechanically stable free-standing bilayer lipid membranes in microfabricated silicon chips'. Together they form a unique fingerprint.

Cite this