| Institution: | 1. Department of Food Sciences and Engineering, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, P.R. China
Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standard and Testing Technology for Agro-Product, Chinese Academy of Agricultural Sciences, Beijing, P.R. China;2. Department of Food Sciences and Engineering, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, P.R. China;3. State Key Laboratory of Biobased Material and Green Papermaking, College of Food Science and Engineering, Shandong Academy of Science, Qilu University of Technology, Jinan, P.R. China;4. International Research Centre "Biotechnologies of the Third Millennium", ITMO University, St. Petersburg, Russia;5. Department of Medical Pharmacology, Medical Faculty, Ataturk University, Erzurum, Turkey;6. Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standard and Testing Technology for Agro-Product, Chinese Academy of Agricultural Sciences, Beijing, P.R. China |
| Abstract: | A simple sensor based on an oligosaccharide-modified three-dimensional graphene (OCS-3D-G) free-standing electrode was developed for the electrochemical determination of the insecticide imidacloprid (IDP). OCS can interact with graphene oxide sheets by π–π and electrostatic interactions, leading to graphene oxide sheets arranged as regular and dense porous structures. T herefore, compared with other modifier carbohydrates, OCS-3D-G is more suitable for electrochemical sensing. OCS-3D-G was synthesized by a hydrothermal method and then fabricated as an electrochemical sensor, and its characterization was done and electrochemical behavior studied in detail. T he optimized sensor showed good reproducibility, selectivity, and stability, and responded linearly over a wide concentration range (1.0–50.0 μM) w ith a limit of detection (LOD) of 0.51 μM. F inally, the proposed sensor was used for the determination of IDP in brown rice, and the results were in line with those obtained from high-performance liquid chromatography (HPLC). It is thereby shown that the developed free-standing electrode is simple and cheap and can be used as a disposable electrode. |
