An ultra-sensitive and selective electrochemical sensor based on GOCS composite and ion imprinted polymer for the rapid detection of Cd2+ in food samples. (1st June 2023)

• Record Type: Journal Article
• Authors: Yin, Fengqin; Mo, Yeling; Liu, Xueting; Yang, Hongzhi; Zhou, Dianli; Cao, Hui; Ye, Tai; Xu, Fei
• Is Part Of: Food chemistry. Volume 410(2023)
• Publication Date: 2023-06-01
• Subjects: Cadmium -- GOCS composites -- Ion-imprinted polymers -- Electrochemical sensor -- Differential pulse voltammetry; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2022.135293
• Languages: English
• ISSNs: 0308-8146

Abstract

Graphical abstract: Highlights: A electrochemical sensor based on GOCS composites and IIP was fabricated for Cd 2+ detection. The proposed sensor exhibited impressive selectivity and reusability. A low detection limit of 0.23 μg/L was obtained through the ultrasensitive sensor. The established method was reliable for Cd 2+ determination in real samples. Abstract: An ultra-sensitive and selective electrochemical sensor was proposed through the combination of carbon disulfide-functionalized graphene oxide (GOCS) composite with high conductivity and cadmium ion-imprinted polymer (IIP). Using pyrrole as the functional monomer and Cd 2+ as the template ion, the IIP was formed by in situ electropolymerization on GOCS composite. Under the optimized experimental conditions, the sensor exhibited a good linear relationship in the range of 0.5–50 μg/L Cd 2+ concentration, with the lowest detection limit of 0.23 μg/L. The sensor exhibited not only good selectivity for the determination of Cd 2+, but also good repeatability with current response remaining 87.6 % after four cycles. Furthermore, the sensor exhibited similar sensing performance in lettuce, orange and peach with recovery ranging from 82.6 % to 110.63 %. This work is expected to provide an electrochemical sensor with excellent selectivity, good stability and sensitivity for the detection of trace amounts of Cd 2+ in real samples.