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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: CHEMISTRYSELECT; v. 4, n. 7, p. 2160-2167, FEB 21 2019.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 14/26420-9 - Desenvolvimento e otimização de catalisadores plasmônicos para mimetização enzimática baseados no sistema CeO2/Au.
• Beneficiário: Larissa Helena de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/22127-2 - Desenvolvimento de novos materiais estratégicos para dispositivos analíticos integrados
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Temático