Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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A Study on the Electrochemical Characteristics of Biosensor with HRP Enzyme Immobilized on SPCE

SPCE에 HRP 효소가 고정화된 바이오센서의 전기화학적 특성에 관한 연구

  • Han, Kyoung Ho (Department of Chemical Engineering, Kwangwoon University) ;
  • Lee, Dae Hyun (GM Technical center Korea) ;
  • Yoon, Do Young (Department of Chemical Engineering, Kwangwoon University) ;
  • Choi, Sangil (Department of Environmental Engineering, Kwangwoon University)
  • 한경호 (광운대학교 공과대학 화학공학과) ;
  • 이대현 ;
  • 윤도영 (광운대학교 공과대학 화학공학과) ;
  • 최상일 (광운대학교 공과대학 환경공학과)
  • Received : 2020.07.10
  • Accepted : 2020.07.21
  • Published : 2020.08.31
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Abstract

Fenton oxidation method using hydrogen peroxide is an eco-friendly oxidation method used in water treatment and soil restoration. When removing pollutants by this method, it is quite important to properly regulate the concentration of hydrogen peroxide according to the concentration of the contaminants. In this study, electrochemical biosensors using HRP (horseradish peroxidase) enzymes were manufactured and studies were conducted on the activity of enzymes and the detection characteristics of hydrogen peroxide. HRP were electro deposited with chitosan and AuNP on the working electrode surface of the SPCE (Screen Printed Carbon Electrode). Then, the fixation of enzymes was confirmed using the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The activity of HRP enzymes was also identified from chronoamperometry (CA) and UV spectroscopy. After immersing the biosensor in PBS solution the current generated from electrodes by titrating hydrogen peroxide was measured from CA analysis. The generated current increased linearly for the concentration of hydrogen peroxide, and a calibration curve was derived that could predict the concentration of hydrogen peroxide from the current.

과산화수소를 이용한 펜톤(Fenton)산화법은 수처리 및 토양 복원분야에서 활용되는 친환경 산화방법이다. 이 방법으로 오염물질을 제거할 때, 오염물의 농도에 따라 과산화수소의 농도를 적절하게 조절하는 것이 상당히 중요하다. 이에 본 연구에서는 HRP (horseradish peroxidase) 효소를 이용한 전기화학적 바이오센서를 제조하고 효소의 활성과 과산화수소의 검출 특성에 대한 연구를 수행하였다. SPCE (Screen Printed Carbon Electrode)의 작업 전극 표면에 키토산과 AuNP를 이용하여 HRP를 전착하였다. 이 후, 전위주사법(CV)과 전기화학적 임피던스 분광법(EIS)을 이용하여 효소의 고정화를 확인하였다. 또한 시간대전류법(CA)과 UV 분광법으로부터 HRP 효소의 활성을 확인하였다. 본 연구에서 제조한 바이오센서를 PBS 전해질에 담그고 과산화수소를 적정하여 CA 분석으로부터 전극에서 발생하는 전류를 측정하였다. 발생 전류는 과산화수소의 농도에 대하여 선형적으로 증가하였으며, 전류로부터 과산화수소의 농도를 예측할 수 있는 검정곡선을 도출하였다.

Keywords

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