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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.)

Sensitive Colorimetric Assay Based on Peroxidase-Like Activity of CeO2 Nanoparticles Supported on SBA-15 Mesoporous Silica to Determination of H2O2

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Author(s):
Oliveira, Larissa H. [1] ; de Barros, Anerise [1, 2] ; Pinto, Lidiane O. [1] ; Oliveira, Cristine S. [1] ; Kubota, Lauro T. [3] ; Sigoli, Fernando A. [1] ; Mazali, Italo O. [1]
Total Authors: 7
Affiliation:
[1] Univ Estadual Campinas, Inst Chem, Lab Funct Mat LMF, POb 6154, BR-13083970 Campinas, SP - Brazil
[2] Univ Dallas Texas, Dept Mat Sci & Engn, Dallas, TX 75080 - USA
[3] Univ Estadual Campinas, Inst Chem, Lab Electrochem Electroanalyt & Sensor Dev LEEDS, POb 6154, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: CHEMISTRYSELECT; v. 4, n. 7, p. 2160-2167, FEB 21 2019.
Web of Science Citations: 0
Abstract

We report a novel combination of nanomaterial proposed as a peroxidase-like enzymatic mimic for detection of H2O2, where CeO2 nanoparticles dispersed on SBA-15 through synthesis by the impregnation-decomposition cycles method (IDC). The system displays a good peroxidase-like activity and catalyzes to the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2. K-M values were calculated between 0.04 and 0.08 mM for different (CeO2/SBA-15)(x) catalyst system, the results demonstrates that the combination of these materials displayed a good affinity to TMB substrate, consequently improving the colorimetric assay, due to uniform mesostructures of SBA-15 and their high surface areas. A detailed study of synergistic effects between CeO(2)NPs and SBA-15 support were held in order to understand how these effects can improve the colorimetric assay. Additionally, high resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, thermogravimetric analysis (TGA), small angle X-ray scattering (SAXS) and textural properties were utilized for characterization of the prepared catalysts systems. (AU)

FAPESP's process: 14/26420-9 - Development and optimization of plasmonic catalysts for enzyme mimic based on CeO2/Au system.
Grantee:Larissa Helena de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
Grantee:Lauro Tatsuo Kubota
Support Opportunities: Research Projects - Thematic Grants