Electrochemical impedimetric biosensors for food safety
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Electrochemical impedimetric biosensors for food safety Changhoon Chai1 • Se-Wook Oh2
Received: 26 February 2020 / Revised: 12 May 2020 / Accepted: 17 May 2020 Ó The Korean Society of Food Science and Technology 2020
Abstract Electrochemical impedimetric biosensors (EIBs) have a simple structure and can be used to rapidly and sensitively detect and measure hazards in food. EIBs detect and measure target molecules by transducing biochemical reactions on their surface to electrical signal outputs responding to a sinusoidal electrical signal input. Due to their structural simplicity and analytical sensitivity, EIBs are regarded as the most potent method of food hazard monitoring that can be implemented in the food supply chain. This paper discusses the theoretical background, structure, and construction of EIB and its applications in food safety.
Zre Zim Zmin re Zmax re Rs Cdl Rct e d
Keywords Electrochemical impedance spectroscopy Biosensor Food safety Pathogen Mycotoxin
Food safety is a key public health issue that begins with monitoring food hazards in including pathogens and chemical contaminants, and is achieved by eliminating or reducing food hazards to acceptable levels. As food hazards can enter the food supply chain at any point from farm to table, monitoring should be implemented at all points. Therefore, methods for monitoring food safety that can be easily implemented within the food supply chain are required. There have been marked advances in food safety monitoring technology over the past two decades, and various monitoring methods have been developed and are currently in use. In particular, electrochemical impedimetric biosensors (EIBs) have attracted a great deal of attention from food safety scientists and administrators. EIBs directly detect and measure target molecules with no sample preparation requirement, and can therefore be used for inline monitoring of hazards in the food supply chain. The sensitivity of EIBs for the detection and measurement of food hazards is comparable to or better than that of other biosensors and traditional methods (Ahmed et al., 2014; Bahadır and Sezgintu¨rk, 2016; Malvano et al., 2019). EIBs can detect and measure food hazards in less than 1 h
List of symbols V The sinusoidal voltage input V0 The maximum amplitude of V I The current output I0 The maximum amplitude of I f The linear frequency t Time x The radial frequency / The phase shift of I Z The impedance |Z| The absolute value of Z & Se-Wook Oh [email protected] 1
Department of Applied Animal Science, Kangwon National University, Chuncheon 24341, Republic of Korea
2
Department of Food and Nutrition, Kookmin University, Seoul 02707, Republic of Korea
The The The The The The The The The
real part of Z imaginary part of Z minimum value of Zre maximum value of Zre electrolyte resistance double-layer capacitance charge-transfer resistance dielectric constant thickness of the electrical double layer
Introduction
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C. Chai, S.-W. Oh
(Ahmed et al., 2014; Chai et al., 2010; Malvano et al., 2019)
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