Acetylcholinesterase biosensor based on chitosan/ZnO nanocomposites modified electrode for amperometric detection of pesticides

DOI

10.2991/mebe-15.2015.39How to use a DOI?

Keywords

ZnO; Pesiticides; Biosensors; Acetylcholinesterase; Liposomes

Abstract

A novel photoelectrochemical biosensor incorporating nanosized ZnO semiconductor crystals with enzyme to enhance photochemical reaction has been investigated. In this work, the ZnO nanoparticles and acetylcholinesterase (AChE) were immobilized on Pt electrode by chitosan (CHI) via layer-by-layer technique (LbL) to fabricate a biological-inorganic hybrid system. Micrographs of (ZnO/CHI/AChE) films were obtained by scanning electron microscope, and photoelectrochemical properties of the resulting biosensors were measured by a three electrodes system and an ultraviolet lamp. Under ultraviolet light, the photo-effect of the ZnO nanoparticles showed enhancement of the biosensor to detect pesticide. Based on the inhibition of organophosphate pesticides on the AChE activity, using malathion as a model compound, the inhibition of malathion was proportional to its concentration ranging from 0.25 to 1.50 and from 1.75 to 10.00 M, with a detection limit of 10 nM estimated at a signal-to-noise ratio of 3. The developed biosensor exhibited good reproducibility, thus providing a new promising tool for analysis of enzyme inhibitors.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Huanan Guan
AU  - Jialiang Jiang
AU  - Dandan Chen
AU  - Wei Wang
AU  - Yan Wang
AU  - Jiaying Xin
PY  - 2015/04
DA  - 2015/04
TI  - Acetylcholinesterase biosensor based on chitosan/ZnO nanocomposites modified electrode for amperometric detection of pesticides
BT  - Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering
PB  - Atlantis Press
SP  - 163
EP  - 166
SN  - 2352-5401
UR  - https://doi.org/10.2991/mebe-15.2015.39
DO  - 10.2991/mebe-15.2015.39
ID  - Guan2015/04
ER  -