Development of a Cheap and Portable Sensing System for Electrochemical Genotyping

Sungbo Cho, Nakseon Seong, James Jungho Pak

Research output: Contribution to conferencePaperpeer-review

3 Citations (Scopus)


This paper reports a cheap and portable electrochemical sensing system, which is based on AT90S8535 one-chip micro-controller, for electrochemical genotyping using a DNA chip. The proposed electrochemical sensing system consists of a signal input part including 555-timer based circuit, a signal detection part including T-feedback amplifier based circuit, a signal control part including AT90S8535, and an output display part. Au was used as electrode material, 2-mercaptoethanol was used as self-assembled monolayer for linking DNA to Au electrode, and methylene blue was used as an indicator that can be selectively bound to double stranded DNAs. By this sensing system, the measured reductive peak voltage of double stranded DNAs (148mV) was larger by approximately 74 mV than that of the single stranded DNAs (74mV). Through the analysis of these values measured from DNA modified electrodes, it is possible to distinguish double stranded DNAs from single stranded DNAs. Thus, the result of genotyping is able to be displayed onto LCD or to be transmitted to a computer in just several seconds.

Original languageEnglish
Number of pages4
Publication statusPublished - 2002
EventFirst IEEE International Conference on Sensors - IEEE Sensors 2002 - Orlando, FL, United States
Duration: 2002 Jun 122002 Jun 14


OtherFirst IEEE International Conference on Sensors - IEEE Sensors 2002
Country/TerritoryUnited States
CityOrlando, FL


  • AT90S8535 one-chip micro-controller
  • Double stranded DNA
  • Methylene blue

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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