Portable Electrochemical Sensing System Attached to Smartphones and Its Incorporation with Paper-based Electrochemical Glucose Sensor

Takuya Fujimoto (Ritsumeikan Universityi, Kusatsu, Shiga, Japan)
Shogo Kawahara (Ritsumeikan Universityi, Kusatsu, Shiga, Japan)
Yukio Fuchigami (Ritsumeikan Universityi, Kusatsu, Shiga, Japan)
Shoji Shimokawa (Ritsumeikan Universityi, Kusatsu, Shiga, Japan)
Yosuke Nakamura (Ritsumeikan Universityi, Kusatsu, Shiga, Japan)
Kenichi Fukayama (Ritsumeikan Universityi, Kusatsu, Shiga, Japan)
Masao Kamahori (Hitachi Ltd, Japan)
Shigeyasu Uno (Ritsumeikan Universityi, Kusatsu, Shiga, Japan)

International Journal of Electrical and Computer Engineering
Vol 7, No 3: June 2017

This paper described the development of a small and low cost biosensor consisting of a smartphone-based electrochemical biosensor device and a paper-based biosensor. The device harvested power from the smartphone and transferred data through audio jack. We designed CMOS circuits including a power supply circuit, a potentiostat, and a ΔΣ modulator. The fabrication of a paper-based biosensor was simple: the three electrodes were directly drawn on chromatography paper using a carbon pencil. The paper-based biosensor was low cost, disposable, portable and friendly to the environment. The sensing system was designed to perform the chronoamperometry measurement, and the glucose concentration in a liquid specimen was detected. Results showed that the sensing system was capable of measuring the glucose concentration as precisely as expensive equipments.