Microfabrication of PMMA sensor chips for an incubation-type planar patch clamp
by Noriko Takada; Masaki Aoyama; Mitsukazu Suzui; Yosuke Hachisu; Hitoshi Ohmori; Zhi-Hong Wang; Hidetaka Uno; Obuliraj Senthil Kumar; Yasutaka Nagaoka; Miho Goto-Satoh; Tsuneo Urisu
International Journal of Nanomanufacturing (IJNM), Vol. 10, No. 3, 2014

Abstract: A sensor chip for use in an ion channel biosensor based on an incubation-type planar patch clamp was formed using both side hot embossing and focused ion beam (FIB) processing. A biosensor was constructed using the PMMA chip, and the performance of this chip was investigated by measuring the laser-stimulated ion channel current of a channel rhodopsin wide receiver (ChRWR) expressed on HEK293 cells. The observed current profile and membrane potential dependences agreed well with the data measured using a pipette patch clamp. The noise level of the channel current recorded using a 1 kHz low pass filter was 7 pA (rms). The sensor chip fabrication processes are readily modified to permit multi-point measurements; therefore, the excellent performance of the PMMA chip indicates that the chip is suitable for use in high-throughput ion channel biosensor screening applications.

Online publication date: Sat, 17-May-2014

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