Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Development of GDH-glucose Sensor using Ferrate Complex

철 화합물을 이용한 당 탈수소화 효소-혈당센서의 연구

  • Choi, Young-Bong (Department of chemistry, College of Advanced Science, Dankook University) ;
  • Lee, Jung-Min (Department of chemistry, College of Advanced Science, Dankook University) ;
  • Kim, Samantha Saeyoung (Gyeonggi Suwon International School) ;
  • Kim, Hyug-Han (Department of chemistry, College of Advanced Science, Dankook University)
  • 최영봉 (단국대학교 자연과학대학 화학과) ;
  • 이정민 (단국대학교 자연과학대학 화학과) ;
  • 김세영 (경기수원외국인학교) ;
  • 김혁한 (단국대학교 자연과학대학 화학과)
  • Received : 2013.12.04
  • Accepted : 2013.01.08
  • Published : 2014.02.28
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Abstract

Redox complexes to transport electrons from enzyme to electrodes are very important part in glucose sensor. Pentacyanoferrate-bound aniline ($Fe(CN)_5$-aminopyridine), was prepared as a potential redox mediator in a glucose dehydrogenase (GDH)-glucose sensor. The synthesized pyridyl-$NH_2$ to pentacyanoferrate was characterized by the electrochemical and spectroscopic methods. A amperometric enzyme-linked electrode was developed based on GDH, which catalyses the oxidation of glucose. Glucose was detected using GDH that was co-immobilized with an $Fe(CN)_5$-aminopyridine and gold nano-particles (AuNPs) on ITO electrodes. The $Fe(CN)_5$-aminopyridine and AuNPs immobilized onto ITO electrodes provided about a two times higher electrochemical response compared to that of a bare ITO electrode. As glucose was catalyzed by wired GDH, the electrical signal was monitored at 0.4 V versus Ag/AgCl by cyclic voltammetry. The anode currents was linearly increased in proportion to the glucose concentration over the 0~10 mM range.

산화/환원 매개체는 혈당 센서의 구성에서 전극과 효소 반응의 전자 전달 매개체로서 중요한 역할을 담당한다. 본 연구에서는 기존의 산화/환원 매개체보다 전자 전달 반응이 용이하며, 높은 민감도를 위해 페레이트에 아닐린을 결합시켜, 1차 아민기를 갖는 $Fe(CN)_5$-aminopyridine를 합성하였다. 합성된 $Fe(CN)_5$-aminopyridine 는 순환 전압 전류 법과 분광학적 방법을 이용하여 합성 결과를 확인하였다. 합성된 물질과 포도당을 측정하기 위한 당 탈 수소 효소를 ITO 전극위에 고정시켜 효소전극을 제작하였고, 또한 신호 증폭을 위하여 금 나노 입자를 함께 고정시켰다. 금 나노 입자가 고정된 효소 전극은 그렇지 않은 전극에 비해 약 2배 가량의 전류 밀도가 증가함을 확인하였다. 만들어진 효소 전극에서 포도당의 농도 별 산화 촉매 전류를 순환 전압 전류 법으로 측정한 결과 0.4 V (vs. Ag/AgCl)에서 전기적 신호가 발생되었으며, 포도당 0~10 mM의 농도 범위에서 전기적 신호가 선형 증가함을 확인할 수 있었다.

Keywords

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