2
|
Morawski FDM, Xavier BB, Virgili AH, Caetano KDS, de Menezes EW, Benvenutti EV, Costa TMH, Arenas LT. A novel electrochemical platform based on mesoporous silica/titania and gold nanoparticles for simultaneous determination of norepinephrine and dopamine. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 120:111646. [PMID: 33545818 DOI: 10.1016/j.msec.2020.111646] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 09/11/2020] [Accepted: 10/14/2020] [Indexed: 12/11/2022]
Abstract
An amorphous and mesoporous silica/titania (SiTi) material was synthesized by sol-gel method and its surface was modified with gold nanoparticles (AuNP) previously stabilized in a chitosan solution. The presence of small AuNP, with diameter lower than 10 nm was confirmed by transmission electron microscopy (TEM) and UV-Vis spectroscopy. Carbon paste electrodes were prepared to test the electrochemical properties by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in [Fe(CN)6]3-/4- solution probe whereby the material silica-titania/gold nanoparticles (SiTi/AuNP) showed a huge improvement in the redox peak current and low charge transfer resistance. This electrode presented a good response for both norepinephrine and dopamine by means of square wave voltammetry (SWV) measurements; great sensitivity for both analytes, in an extensive linear range, was obtained. The limits of detection were 0.35 μmol L-1 and 0.57 μmol L-1 for norepinephrine and dopamine, respectively. Additionally, this electrode showed high selectivity for both analytes and it was applied in the simultaneous determination of norepinephrine and dopamine. The sensor was also tested in simulated biological fluids presenting a good recovery. The SWV electrochemical response of norepinephrine was also investigated in the presence of possible interferers such as uric acid, ascorbic acid and glucose and there was no significant interference. The prepared electrode also exhibits good reproducibility for norepinephrine detection, with relative standard deviation of 5.19%.
Collapse
Affiliation(s)
- Franciele de Matos Morawski
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Brenda Borges Xavier
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Anike Hübner Virgili
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Karine Dos Santos Caetano
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Eliana Weber de Menezes
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Edilson Valmir Benvenutti
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Tania Maria Haas Costa
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Leliz Ticona Arenas
- Laboratory of Solids and Surfaces (LSS), Institute of Chemistry, UFRGS, CP 15003, CEP 91501-970 Porto Alegre, RS, Brazil.
| |
Collapse
|
4
|
Dal Magro L, de Moura KS, Backes BE, de Menezes EW, Benvenutti EV, Nicolodi S, Klein MP, Fernandez-Lafuente R, Rodrigues RC. Immobilization of pectinase on chitosan-magnetic particles: Influence of particle preparation protocol on enzyme properties for fruit juice clarification. ACTA ACUST UNITED AC 2019; 24:e00373. [PMID: 31516853 PMCID: PMC6728273 DOI: 10.1016/j.btre.2019.e00373] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 08/19/2019] [Accepted: 08/22/2019] [Indexed: 12/16/2022]
Abstract
Magnetic-chitosan particles were prepared following three different protocols enabling the preparation of particles with different sizes - nano (Nano-CMag, Micro (Micro-CMag) and Macro (Macro-CMag) - and used for pectinase immobilization and clarification of grape, apple and orange juices. The particle size had a great effect in the kinetic parameters, Nano-CMag biocatalyst presented the highest Vmax value (78.95 mg. min-1), followed by Micro-CMag and Macro-CMag, with Vmax of 57.20 mg.min-1 and 46.03 mg.min-1, respectively. However, the highest thermal stability was achieved using Macro-CMag, that was 8 and 3-times more stable than Nano-CMag and Micro-CMag biocatalysts, respectively. Pectinase immobilized on Macro-CMag kept 85% of its initial activity after 25 batch cycles in orange juice clarification. These results suggested that the chitosan magnetic biocatalysts presented great potential application as clarifying catalysts for the fruit juice industry and the great importance of the chitosan particles preparation on the final biocatalyst properties.
Collapse
Affiliation(s)
- Lucas Dal Magro
- Biotechnology, Bioprocess and Biocatalysis Group, Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, P.O. Box 15090, ZC 91501-970, Porto Alegre, RS, Brazil
- Department of Biocatalysis, ICP-CSIC, Campus UAM-CSIC, Cantoblanco, ZC 28049, Madrid, Spain
| | - Kelly Silva de Moura
- Biotechnology, Bioprocess and Biocatalysis Group, Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, P.O. Box 15090, ZC 91501-970, Porto Alegre, RS, Brazil
| | - Betina Elys Backes
- Biotechnology, Bioprocess and Biocatalysis Group, Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, P.O. Box 15090, ZC 91501-970, Porto Alegre, RS, Brazil
| | - Eliana Weber de Menezes
- Laboratory of Solids and Surfaces, Institute of Chemistry, UFRGS, P.O. Box 15003, ZC 91501-970, Porto Alegre, RS, Brazil
| | - Edilson Valmir Benvenutti
- Laboratory of Solids and Surfaces, Institute of Chemistry, UFRGS, P.O. Box 15003, ZC 91501-970, Porto Alegre, RS, Brazil
| | - Sabrina Nicolodi
- Magnetism Laboratory, Institute of Physics, Federal University of Rio Grande do Sul, P.O. Box 15051, ZC 91501-970, Porto Alegre, RS, Brazil
| | - Manuela P. Klein
- Department of Nutrition, Federal University of Health Sciences of Porto Alegre (UFCSPA), ZC 90050-170, Porto Alegre, RS, Brazil
| | - Roberto Fernandez-Lafuente
- Department of Biocatalysis, ICP-CSIC, Campus UAM-CSIC, Cantoblanco, ZC 28049, Madrid, Spain
- Corresponding authors.
| | - Rafael C. Rodrigues
- Biotechnology, Bioprocess and Biocatalysis Group, Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, P.O. Box 15090, ZC 91501-970, Porto Alegre, RS, Brazil
- Corresponding authors.
| |
Collapse
|
5
|
Luza L, Gual A, Fernandes JA, Eberhardt D, Dupont J. Tunneling effects in confined gold nanoparticle hydrogenation catalysts. Phys Chem Chem Phys 2019; 21:16615-16622. [PMID: 31317171 DOI: 10.1039/c9cp03012c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Clean surface gold nanoparticles (AuNPs) of ∼6.6 nm that were confined in ionic liquid (IL) cages of hybrid γ-alumina (γ-Al2O3) displayed hydrogenation pathways in the reduction of trans-cinnamaldehyde distinct from those imprinted directly onto γ-Al2O3. Hydrogen activation proceeded via homolytic activation in IL-encapsulated AuNPs and via heterolytic cleavage for IL-free supported AuNPs. Higher negative apparent entropy (ΔSapp) values were obtained for the IL-confined AuNPs compared to the non-hybrid catalyst (Au/γ-Al2O3), suggesting a decrease in the number of microstates induced by the nano-confined environment. High kinetic isotope effect (KIE) values (kH/kD = 2.5-2.9 at 273 K) and Arrhenius convex curves were observed. Furthermore, differences of 5.6 and 6.2 kJ mol-1 between the apparent activation energies of the deuteration and hydrogenation reactions (E-E) associated with pre-exponential factor ratios (AD/AH) of 4.6 and 5.1 provided strong evidence of the possible involvement of a tunneling pathway in the case of the confined AuNPs.
Collapse
Affiliation(s)
- Leandro Luza
- Laboratory of Molecular Catalysis, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, Brazil.
| | - Aitor Gual
- Unitat de Tecnología Química (UTQ)-EURECAT, Centre Tecnològic de la Química de Catalunya (CTQC), c/Marcel.lí Domingo, s/n, Building N5, Tarragona 43007, Spain
| | | | - Dario Eberhardt
- PUCRS, Centro Interdisciplinar de Nanociências e Micro-Nanotecnologia, Av. Ipiranga, 6681, Porto Alegre, Brazil
| | - Jairton Dupont
- Laboratory of Molecular Catalysis, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, Brazil.
| |
Collapse
|