Uric acid electrochemical sensing in biofluids based on Ni/Zn hydroxide nanocatalyst

Author(s)

Azeredo, Nathalia F. B. ^{[1, 2]} ; Goncalves, Josue M. ^{[1, 3]} ; Rossini, Pamela O. ^{[1, 3]} ; Araki, Koiti ^{[1, 3]} ; Wang, Joseph ^[2] ; Angnes, Lucio ^{[1, 3]}

Affiliation

^[1] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Sao Paulo - Brazil

^[2] Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 - USA

^[3] Wang, Joseph, Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 USA.Azeredo, Nathalia F. B., Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Sao Paulo - Brazil

• Document type: Journal article
• Source: Microchimica Acta; v. 187, n. 7 JUN 9 2020.
• Web of Science Citations: 0

Abstract

A highly sensitive sensor for quantification of uric acid (UA) directly in body fluids (saliva and sweat) is reported, working at a potential as low as 0.0 V vs Ag/AgCl. New mixed hydroxide materials exhibiting stable electrocatalytic responses from alkaline to acidic media were prepared, their structure was thoroughly characterized, and the electrochemical properties of the modified FTO (fluorine-doped tin oxide) electrodes were evaluated for UA determination by cyclic voltammetry, chronoamperometry,and batch injection analysis. A very low limit of detection (2.3 x 10(-8) mol L-1) with good repeatability (RSD = 3.2% for 30 successive analyses)was achieved based on a fast and simple BIA procedure. Finally, alpha-Ni0.75Zn0.25(OH)(2)screen-printed electrodes (SPE) were developed for the measurement of UA directly in real saliva and sweat samples, without interference of ascorbic acid, acetaminophen, lactate,and glucose at their typical concentrations present in those body fluids, revealing high potential for application as disposable sensors in biological systems. (AU)

• FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
• Grantee: Lauro Tatsuo Kubota
• Support type: Research Projects - Thematic Grants
• FAPESP's process: 17/13137-5 - Formation and properties of hemiesters of carbonic acid in aqueous medium
• Grantee: Claudimir Lucio Do Lago
• Support type: Research Projects - Thematic Grants
• FAPESP's process: 18/21489-1 - Supramolecular nanotechnology: design, materials and devices
• Grantee: Henrique Eisi Toma
• Support type: Research Projects - Thematic Grants
• FAPESP's process: 18/16896-7 - Development of amperometric and impedimetric sensors based on double hydroxides of nickel and vanadium (alpha-NixV1-x(OH)2) and their nanocomposites with expandable graphite/graphene
• Grantee: Josué Martins Gonçalves
• Support type: Scholarships in Brazil - Post-Doctorate