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Vol. 149, No. 2, February 2013, pp. 116-122

 

Bullet

 

A Design of Portable Pesticide Residue Detection System Based on the Enzyme Electrode
 
Xia SUN, Xiaoxu SUN, * Xiangyou WANG

School of Agriculture and Food Engineering, Shandong University of Technology,

No. 12, Zhangzhou Road, Zibo 255049, Shandong Province, P. R. China

Tel.:+86-533-2786558, fax: +86-533-2786558

E-mail: wxy@sdut.edu.cn

 

Received: 18 October 2012   /Accepted: 14 February 2013   /Published: 28 February 2013

Digital Sensors and Sensor Sysstems

 

Abstract: In this paper, a portable detection system was designed based on amperometric acetylcholinesterase biosensor for rapidly detecting pesticide residues in fruits and vegetables. There were potentiostat, three electrode system, differential amplification circuit and double integral analog to digital (A/D) circuit modules in this system. The measurement principle of this system was depended on the weak current from enzyme catalyzing substrate in acetylcholinesterase biosensor for detecting pesticide residues. The weak current generated by the enzyme biosensor was changed into 0-5 V standard voltage signal by this system as an output signal. The proposed system was investigated with eight kinds of standard pesticide of different concentrations, the results showed that the detection limits were all lower than 10 ng/kg. Thus, a new effective home-made system of detecting pesticide residues with portable, easy-to-use, fast response was developed. The pesticide residues rapid detection system can collect the weak current signal generated by electrochemical reaction and on-site detect the concentration of pesticide residues in real fruits and vegetables samples.

 

Keywords: Enzyme biosensor, Pesticide detection system, Double integral A/D converter, Three electrode system

 

 

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