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Electrochemical Detection of Self-Assembled Viologen Modified Electrode as Mediator of Glucose Sensor

  • Lee, Dong-Yun (Dept. of Electrical Engineering & NTRC, Dong-A University) ;
  • Choi, Won-Suk (Dept. of Electrical Engineering & NTRC, Dong-A University) ;
  • Park, Sang-Hyun (Dept. of Electrical Engineering & NTRC, Dong-A University) ;
  • Kwon, Young-Soo (Dept. of Electrical Engineering & NTRC, Dong-A University)
  • Published : 2009.03.01

Abstract

An amperometric glucose biosensor has been developed using viologen derivatives as a charge transfer mediator between a glucose oxidase (GOD) and a gold electrode. A highly stable self-assembled monolayer (SAM) of thiol-based viologen was immobilized onto the gold electrode of a quartz crystal microbalance (QCM) and GOD was immobilized onto the viologen modified electrode. This biosensor response to glucose was evaluated amperometrically in the potential of -300mV. Upon immobilization of the glucose oxidase onto the viologen modified electrode, the biosensor showed rapid response towards glucose. Experimental conditions influencing the biosensor performance, such as pH potential, were optimized and assessed. This biosensor offered excellent electrochemical responses for glucose concentration below ${\mu}$ mol level with high sensitivity and selectivity and short response time. The levels of the RSDs (<5%) for the entire analyses reflected the highly reproducible sensor performance. A linear calibration range between the current and the glucose concentration was obtained up to $4.5{\times}10^{-4}M$. The detection limit was determined to be $3.0{\times}10^{-6}M$.

Keywords

References

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