A portable acetylcholinesterase-based electrochemical sensor for field detection of organophosphorus

Long Wen; Jianfang Wang; Zhuoliang Liu; Cheng-An Tao; Jialing Rao; Jian Hang; Yujiao Li

doi:10.1039/d2ra05383g

A portable acetylcholinesterase-based electrochemical sensor for field detection of organophosphorus

RSC Adv. 2023 Mar 3;13(10):6389-6395. doi: 10.1039/d2ra05383g. eCollection 2023 Feb 21.

Authors

Long Wen¹, Jianfang Wang¹, Zhuoliang Liu¹, Cheng-An Tao¹, Jialing Rao¹, Jian Hang¹, Yujiao Li¹

Affiliation

¹ College of Science, National University of Defense Technology Changsha 410073 P. R. China wangjianfang@nudt.edu.cn.

Abstract

A portable acetylcholinesterase (AChE)-based electrochemical sensor based on a screen-printed carbon electrode (SPCE) and a miniature potentiostat was constructed for the rapid field detection of organophosphorus pesticides (OPs). Graphene (GR) and gold nanoparticles (AuNPs) were successively introduced onto SPCE for surface modification. Due to the synergistic effect of the two nanomaterials, the signal of the sensor has a significant enhancement. Take isocarbophos (ICP) as a model for chemical warfare agents (CAWs) and Ops; the SPCE/GR/AuNPs/AChE/Nafion sensor shows a wider linear range (0.1-2000 μg L^-1), and a lower limit of detection (0.012 μg L^-1) than SPCE/AChE/Nafion and SPCE/GR/AChE/Nafion sensors. Tests in actual fruit and tap water samples also yielded satisfactory results. Therefore, the proposed method can be used as a simple and cost-effective strategy for construction of portable electrochemical sensors for OP field detection.