Development of a molecularly imprinted polymer for uric acid sensing based on a conductive azopolymer: Unusual approaches using electrochemical impedance/capacitance spectroscopy without a soluble redox probe

Author(s)

Trevizan, Heitor Furlan ^[1] ; Olean-Oliveira, Andre ^[1] ; Cardoso, Celso Xavier ^[1] ; Teixeira, Marcos F. S. ^[1]

Affiliation

^[1] Sao Paulo State Univ UNESP, Sch Sci & Technol, Dept Chem & Biochem, Rua Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil

• Document type: Journal article
• Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 343, SEP 15 2021.
• Web of Science Citations: 2

Abstract

In the present study, we report the use of an electrochemical sensor for uric acid using a molecularly imprinted polymer (MIP) as a molecular recognition platform. The MIP was based on an azopolymer electropolymerized in the presence of uric acid used as a template molecule. The azo group of the polymer contributes to the quantifiable redox capacitance of the electrode surface, which can be probed by impedance/capacitance spectroscopy. Thus, the advantage of the developed sensor is its ability to perform direct measurements without a soluble redox probe. The molecularly imprinted polymer can sensitively transduce the recognition and binding of specific analytes by redox capacitance. Through electrochemical impedance spectroscopy (EIS) and electrochemical capacitive spectroscopy (ECS), unusual approaches were able to obtain different analytical curves with distinct characteristics, reaching a limit of detection of 0.160 mu mol L-1. (AU)

• FAPESP's process: 16/09017-1 - STUDY OF THE FILM FORMATION OF SCHIFF BASE METALLIC COMPLEXES
• Grantee: Marcos Fernando de Souza Teixeira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC