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Updated: Mar 31, 2026
Multi-analyte Biochip MAB Based on All-solid-state Ion-selective Electrodes ASSISE for Physiological Research
Published on: April 18, 2013
Potentiometric bioimaging with a large-scale integration (LSI)-based electrochemical device for detection of enzyme
Yusuke Kanno1, Kosuke Ino1, Chika Sakamoto1
1Graduate School of Environmental Studies, Tohoku University, 6-6-11-604 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan.
Abstract:
This paper describes potentiometric bioimaging for enzyme activity using a large-scale integration (LSI)-based electrochemical device with 400 sensors. Potentiometric detection is useful for bioimaging because redox species are not consumed or produced during the detection process; therefore, there is no effect on cell activity and the detectable signal is sustained. In this study, the potentiometer mode of the LSI-based device was applied for the detection of glucose oxidase (GOx) and alkaline phosphatase (ALP) activity. The enzyme activities were quantitatively detected within the concentration ranges of 25-250 μg/mL and 0.10-5.0 ng/mL. In addition, GOx activity in hydrogels and the ALP activity of embryoid bodies (EBs) from embryonic stem (ES) cells were successfully imaged based on detection of the open circuit potentials of individual sensors in real time. To the best of our knowledge, this is the first report of potentiometric imaging using LSI-based electrochemical arrays to detect enzyme activity in ES cells. The LSI-based device is thus demonstrated to be a promising tool for bioimaging of enzyme activity.
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