Browsing by Author "Aguirre, Maria J."
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- ItemA New Modified Electrode with a Copolymer of Aniline/Fe(III)-Tetrakis(Para-Aminophenyl)Porphyrin: Test of Its Electrocatalytic Activity Toward the Reduction of Molecular Oxygen and Oxidation of Ascorbic Acid and Sulfite Ion.(2012) Lucero, Mauricio; Riquelme Valenzuela, Maritza; Ramírez Jofré, Galo; Goya, M. Carmen; Gonzalez Orive, Alejandro; Hernandez Creus, Alberto; Arevalo, M. Carmen; Aguirre, Maria J.
- ItemA potentiometric hydrazine sensor: para-Ni-tetraaminophenyl-porphyrin/Co-cobaltite/SNO2 : F modified electrode(2007) Bravo, Paz; Isaacs, Fabiola; Ramírez Jofré, Galo; Azocar, Ignacio; Trollund, Ejnar; Aguirre, Maria J.
- ItemCharacterization of PVC-Tetraruthenated Metalloporphyrins Modified Electrodes: Application as Electrocatalyst in the Nitrite Reduction(2011) Calfuman, Karla; Dreyse, Paulina A.; Garcia, Camilo; Aguirre, Maria J.; Beltran, Tomas; Guillamon, Eva; Sorribes, Ivan; Vicent, Cristian; Llusar, Rosa; Isaacs Casanova, Mauricio
- ItemDETERMINATION OF LOW MOLECULAR WEIGHT CARBOHYDRATES IN CABERNET SAUVIGNON RED WINES(2009) Matsuhiro, Betty; Torres, Rodrigo; Zuniga, Elisa A.; Aguirre, Maria J.; Mendoza, Leonora; Isaacs Casanova, Mauricio
- ItemElectrical and Electrochemical Behavior of Carbon Paste Electrodes Modified with Ionic Liquids Based in N-Octylpyridinium Bis(Trifluoromethylsulfonyl)Imide. A Theoretical and Experimental Study(2019) Baez, Carla; Navarro, Freddy; Fuenzalida, Francesca; Aguirre, Maria J.; Carmen Arevalo, M.; Afonso, Maria; Garcia, Camilo; Ramirez, Galo; Antonio Palenzuela, J.In this work, we studied carbon paste electrodes (CPEs) with two kinds of binders: mineral oil or ionic liquids (IL) derived from N-substituted octyl pyridinium bis(trifluoromethylsulfonyl)imide with the substituents H-, CH3-, CN- and CF3-. The work aims to study this series of IL and determine a possible effect of the substituent of the cation in the behavior of the IL as a binder of graphite for obtaining IL-CPEs. The electrochemical response and the electrical behavior were measured by cyclic voltammetry and electrochemical impedance spectroscopy, respectively. Surprisingly, the substituent does not affect the cyclic voltammetry response because in all the cases, high resistance and high capacitive currents were obtained. The best response in terms of conductivity is obtained by CPE. In the case of impedance measurements, the substituent does not cause differences, and in all the cases, the IL-CPEs show nearly the same responses. CPE shows lower capacitance and higher resistance for diffusion compared to the IL-CPEs due to his lower porosity. The high resistance showed by the IL-CPEs by cyclic voltammetry can be attributed to poorly intermolecular forces among graphite, water, electrolyte, and ILs as demonstrated by theoretical calculations.
- ItemElectro-Reduction of Molecular Oxygen Mediated by a Cobalt(II) octaethylporphyrin System onto Oxidized Glassy Carbon/Oxidized Graphene Substrate(2018) Canales Oyarzo, Camila Pía; Gidi Chomalí, Leyla Denisse; Arce, Roxana; Armijo Mancilla, Juan Francisco; Aguirre, Maria J.; Ramírez Jofré, Galo
- ItemElectrochemical behaviour and antioxidant capacity of anthocyanins from Chilean red wine, grape and raspberry(2010) Aguirre, Maria J.; Chen Carrillo, Yo-Ying Adriana; Isaacs Casanova, Mauricio; Matsuhiro, Betty; Mendoza, Leonora; Torres, Simonet
- ItemELECTROCHEMICAL METHOD FOR SULFITE DETERMINATION IN WINES BY ELECTROCHEMICAL RESPONSE USING A MEMBRANE ABSORBER SYSTEM(SOC CHILENA QUIMICA, 2016) Arce, Roxana; Baez, Carla; Muena, J. P.; Aguirre, Maria J.; Romero, JulioThis research demonstrates how the sulfite content can be measured by cyclic voltammetry using a previously reported membrane absorber system, which separates efficiently sulfite present in wine. Results obtained show notably similar values to those obtained for the same wine samples using modified MonierWilliams method (aspiration method) and Ripper method. The membrane absorber system allows the release of the free SO2, and can be used to determine the sulfur dioxide present in juices and other foods that contain high concentrations of phenols, polyphenols and other structurally related compounds that act as interferers in the electrochemical oxidation of sulfite. The absorber solution allows a direct measurement without change in pH or added electrolyte, facilitating the determination of great amounts of samples from diverse wines using only one calibration curve. In this way, a system that allows the detection of sulfite and that can be used in vineyards is obtained.
- ItemElectrochemical preparation of conductive films of tetrapyridylporphyrins coordinated to four [Ru(5-NO2-phen)2Cl]+ groups(2010) Dreyse, Paulina A.; Isaacs Casanova, Mauricio; Iturriaga, Patricio E.; Villagra, Diego A.; Aguirre, Maria J.; Kubiak, Clifford P.; Glover, Starla D.; Goeltz, John C.
- ItemElectrochemical Properties of a Conducting Film Derived from Iron(II) Tris(diaminopolypyridyl) Complex in the S(IV) Oxoanions Reduction(2011) Garcia, Camilo; Dominguez, Cristian; Aliaga, Alvaro; Matsuhiro, Betty; Mendoza, Leonora; Aguirre, Maria J.; Isaacs Casanova, Mauricio
- ItemElectrochemical reduction of SO2 on poly-Co-3-tetraaminophenylporphyrin glassy carbon modified electrode(2009) Fuenzalida, Francesca; Dreyse, Paulina A.; Villagra, Diego; Matsuhiro, Betty; Mendoza, Leonora; Aguirre, Maria J.; Isaacs Casanova, Mauricio
- ItemELECTROOXIDATION AND DETERMINATION OF SULFITE IN ETHANOL-WATER SOLUTIONS USING POLY-Cu(II)-TETRAKIS(x-AMINOPHENYL)PORPHYRIN/GLASSY CARBON MODIFIED ELECTRODES(2009) Bravo, Paz; Chen Carrillo, Yo-Ying Adriana; Ramírez Jofré, Galo; Canales, Maria J.; Matsuhiro, Betty; Mendoza, Leonora; Isaacs Casanova, Mauricio; García, Macarena; Arevalo, Maria C.; Aguirre, Maria J.
- ItemElectrooxidation of Nitrite Mediated by Cu-x-Tetraaminophenylporphyrin (x=2, 3, and 4) Glassy Carbon-Modified Electrodes: Effect of Substituent Position(2008) Camargo, Andres; Aguirre, Maria J.; Cheuquepan, William; Chen Carrillo, Yo-Ying Adriana; Ramírez Jofré, Galo
- ItemEvidence for the Formation of a Copolymer by Simultaneous Electropolymerization of p-Tetraaminophenyl Porphyrin Cobalt (II)) and o-Phenylenediamine on Glassy Carbon(2012) Arce, Roxana; Río Quero, Rodrigo del; Ruiz-Leon, Domingo; Vélez Cifuentes, Jorge; Isaacs Casanova, Mauricio; Valle de la Cortina, María Angélica del; Aguirre, Maria J.
- ItemFour-electron reduction of oxygen electrocatalyzed by a mixture of porphyrin complexes onto glassy carbon electrode(2018) Gidi Chomalí, Leyla Denisse; Canales Oyarzo, Camila Pía; Aguirre, Maria J.; Armijo Mancilla, Juan Francisco; Ramírez Jofré, Galo
- ItemLeyla Gidi, Camila Canales, Maria J. Aguirre, Francisco Armijo, and Galo Ramirez, Four-Electron Reduction of Oxygen Electrocatalyzed by a Mixture of Porphyrin Complexes onto Glassy Carbon Electrode (vol 13, pg 1666, 2018)(ESG, 2018) Gidi, Leyla; Canales, Camila; Aguirre, Maria J.; Armijo, Francisco; Ramirez, Galo© 2018 The Authors.The exact received date of the paper is 24 October 2017 year.
- ItemNitrite reduction on a multimetallic porphyrin/polyoxotungstate layer-by-layer modified electrodes(2016) García, Macarena; Honores Sotelo, Jessica Scarlet; Quezada Sandoval, Diego Alonso; Díaz Navarro, Carlos Patricio; Dreyse, Paulina A.; Celis, Freddy; Canzi, Gabriele; Guzman, Fernando; Isaacs Casanova, Mauricio; Kubiak, Clifford P.; Aguirre, Maria J.