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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Voltammetric determination of ethinylestradiol using screen-printed electrode modified with functionalized graphene, graphene quantum dots and magnetic nanoparticles coated with molecularly imprinted polymers

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Santos, Anderson M. [1] ; Wong, Ademar [1, 2, 3] ; Prado, Thiago M. [1] ; Fava, Elson L. [1] ; Fatibello-Filho, Orlando [1] ; Sotomayor, Maria D. P. T. [2, 3] ; Moraes, Fernando C. [1]
Total Authors: 7
[1] Univ Fed Sao Carlos, Dept Chem, Rod Washington Luis Km 235, POB 676, BR-13560970 Sao Carlos, SP - Brazil
[2] State Univ Sao Paulo, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil
[3] INCT DATREM, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Talanta; v. 224, MAR 1 2021.
Web of Science Citations: 0

The present work reports the development of a sensitive and selective method for ethinylestradiol detection using screen-printed electrode (SPE) modified with functionalized graphene (FG), graphene quantum dots (GQDs) and magnetic nanoparticles coated with molecularly imprinted polymers (mag@MIP). The performance of the mag@MIP sensor was compared with that of a non-molecularly imprinted sensor (mag@NIP). Chemical and physical characterizations of the mag@NIP and mag@MIP sensors were performed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Brunauer-Emmett-Teller (BET) techniques. The electrochemical behavior of the electrodes investigated, which included (mag@MIP)-GQDs-FG-NF/SPE, (mag@NIP)-GQDs-FG-NF/SPE, GQDs-FG-NF/SPE and FG-NF/SPE, was evaluated by cyclic voltammetry. The results obtained show a significant increase in peak current magnitude for (mag@MIP)-GQDs-FG-NF/SPE. Using square wave voltammetry experiments, the efficiency of the (mag@MIP)-GQDs-FG-NF/SPE sensor was also tested under optimized conditions. The linear response range obtained for ethinylestradiol concentration was 10 nmol L-1 to 2.5 mu mol L-1, with limit of detection of 2.6 nmol L-1. The analytical signal of the (mag@MIP)-GQDs-FG-NF/SPE sensor suffered no interference from different compounds and the sensor exhibited good repeatability. The proposed sensor was successfully applied for ethynilestradiol detection in river water, serum and urine samples, where recovery rates between 96 to 105% and 97-104% were obtained for environmental and biological samples, respectively. (AU)

FAPESP's process: 16/10012-4 - Development of a disposable biosensors array with a microfluidic device for multiplex determination of species of biological interest in different matrices
Grantee:Elson Luiz Fava
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 20/01050-5 - Development and application of electrochemical and photoelectrochemical sensors for the determination of emerging contaminants in environmental samples
Grantee:Orlando Fatibello Filho
Support type: Regular Research Grants
FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
Grantee:Marcos Roberto de Vasconcelos Lanza
Support type: Research Projects - Thematic Grants
FAPESP's process: 19/00677-7 - RADes-MIP - preparation and synthesis of materials for development of rapid analysis devices for monitoring emerging pollutants using highly selective biomimetic polymers based on molecular printing technology
Grantee:Maria Del Pilar Taboada Sotomayor
Support type: Regular Research Grants