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A Contribution on the Elucidation of the Electrooxidation Mechanism of Gentisaldehyde on a Glassy Carbon Electrode
Estévez Brito, Rafael; Rodríguez Mellado, José Miguel; Palma López, Alberto; Ruiz Montoya, Mercedes; Rodríguez Amaro, Rafael; Mayén, Manuel (The Electrochemical Society, 2016-10-28)The electrochemical behavior of gentisaldehyde (2,5-dihydroxibenzaldehyde) on a glassy carbon electrode is studied by linear-sweep cyclic voltammetry finding one to three oxidation peaks, depending on both the number of ... -
Actas de las V Jornadas ScienCity 2022. Fomento de la Cultura Científica, Tecnológica y de Innovación en Ciudades Inteligentes
Álvarez Polegre, Alberto; Troncoso, E.; Robles Romero, José Miguel; Cislowska, Anna Izabela; Peña Acuña, Beatriz; Rodríguez Sánchez, María Cristina; Ramiro, Julio; Villoria, Pablo; Morales, Gabriel; Orellana, Javier; Melero Hernández, Juan Antonio; Castro Ortiz, Juan Carlos; Rodríguez Pérez, Ángel Mariano; Márquez Rodríguez, Alba; Pulido Calvo, Inmaculada; Pino Fernández, Joaquín del; Ríos Gutiérrez, Juan Adelaido; Barragán Piña, Antonio Javier; Enrique Gómez, Juan Manuel; Ruiz Castilla, Daniel; Andújar Márquez, José Manuel; Semião, Jorge; Oliveira, L.; Masiá Montalvá, Vicente; Bermejo Muñoz, Jesús; Maestro Molina, G.; Corralejo Mora, José María; Lozano Domínguez, José Manuel; Mateo Sanguino, Tomás Jesús; Redondo González, Manuel Joaquín; Perdigones Gómez, Mercedes; Caparrós Mancera, Julio José; Tejada Guzmán, Diego; Isorna Llerena, Fernando; Naz García, Carlos; López González, Eduardo; Rengel Gálvez, Rosa María; Vargas Vázquez, Laura; Delgado Sánchez, Clara; Tenorio Alfonso, Adrián; Cortés Triviño, Esperanza; Martín Alfonso, María José; Cuadri Vega, Antonio Abad; Clemente Castro, Sergio; Palma López, Alberto; Ruiz Montoya, Mercedes; Díaz Blanco, Manuel Jesús; Giráldez Díaz, Inmaculada; Figueiredo Dias, A.F. de; Lopes da Silva Afonso dos Santos, C.M.; Barrera Rodríguez, Águeda; Padilla Rebollo, G.; García Villagrán, J.; Romero Molina, J.J.; Wendy, R.; Arola, A.; Martínez Luna, Macarena; Segura Manzano, Francisca; Ceada Garrido, Yolanda; Candeias, Viviane; Rodrigues, Elsa; Luz, Luís; Tomaz, Alexandra; Almeida, António; Brito, Isabel Sofia; Hernández Torres, José Antonio; Rodríguez González, César Antonio; Faria, Maria Inês; Furtado, Diana Sofia; Martins, Ana Margarida; Morillo Reina, Juan Diego; Al-Jaliel, Ali; Sánchez Herrera, María Reyes; Pérez Torreglosa, Juan; Rey, Jesús; Vivas Fernández, Francisco José; Mora Macías, Juan; Cruz Viejo, Victoria; Perea, David; Bailoa, Sandra; Cravo, Pedro; Hernández Garrido, Rocío; Pérez Calañas, Cinta; Iranzo Llopis, Carlos Enrique; Loaiza Rodríguez, Javier Mauricio; González Duque, José Antonio; Pedro, Celso; Luiz, Pedro; Pian, Lívia; Caldinhas, Maria; Guerrero, Carlos; Dias, Cristina; Santos, Carla; Morón Monge, María Carmen; Trabajo Rite, Mónica; Morón Monge, Hortensia; Pardo Garrido, David; Rivera Moreno, Leticia; González Sánchez, Luis; Dias, Ana; Toro Peral, Marcos del (Universidad de Huelva, 2023)ScienCity es una actividad que viene siendo continuada desde 2018 con el objetivo de dar a conocer los conocimientos y tecnologías emergentes siendo investigados en las universidades, informar de experiencias, servicios e ... -
An Electrochemical Method for the Determination of Antioxidant Capacities Applied to Components of Spices and Condiments
Rivas Romero, María Pilar; Estévez Brito, Rafael; Palma López, Alberto; Ruiz Montoya, Mercedes; Rodríguez Mellado, José Miguel; Rodríguez Amaro, Rafael (The Electrochemical Society, 2017-01-24)The antioxidant activity of a set of 17 active principles present in foods is studied by using two sets of methods: i) spectrophotometric, DPPH radical scavenging method and CUPRAC assay; ii) electrochemical, using either ... -
Analysis of the Interaction of Radical Scavengers with ROS Electrogenerated from Hydrogen Peroxide
Palma López, Alberto; Ruiz Montoya, Mercedes; Fernández Arteaga, Jesús; Rodríguez Mellado, José Miguel (The Electrochemical Society, 2013-02-05)The polarographic (direct current, dc, and differential pulse, DP) and voltammetric oxidation of hydrogen peroxide on mercury electrodes has been examined. The electrooxidation of H2O2 involves hydroperoxide radical and ... -
Comparative study of the combustion, pyrolysis and gasification processes of Leucaena leucocephala: Kinetics and gases obtained
Clemente Castro, Sergio; Palma López, Alberto; Ruiz Montoya, Mercedes; Giráldez Díaz, Inmaculada; Díaz Blanco, Manuel Jesús (Elsevier, 2023-07)Leucaena leucocephala is a fast-growing leguminous biomass with great energetical and valueadded chemical compounds potential (saccharides, biogas, bio-oil, etc.). Using the thermogravimetric and derivative thermogravimetric ... -
Comparison of the Simple Cyclic Voltammetry (CV) and DPPH Assays for the Determination of Antioxidant Capacity of Active Principles
Fernández Arteaga, Jesús; Ruiz Montoya, Mercedes; Palma López, Alberto; Alonso Garrido, Gema; Pintado, Sara; Rodríguez Mellado, José Miguel (MDPI, 2012)Antioxidant activity of a number of small (low molecular weight) natural compounds found in spices, condiments or drugs (gallic acid, sesamol, eugenol, thymol, carvacrol, vanillin, salicylaldehyde, limonene, geraniol, ... -
Desarrollo e implementación de métodos electroquímicos para determinar la capacidad antioxidante de muestras orgánicas
Palma López, Alberto (Universidad de Huelva, 2015)El estrés oxidativo es uno de los procesos bioquímicos estudiados de mayor relevancia en los últimos años que surge como consecuencia de un desequilibrio entre las sustancias antioxldantes y prooxidantes. Este fenómeno ... -
Determination of antioxidant activity of spices and their active principles by Differential Pulse Voltammetry
Palma López, Alberto; Ruiz Montoya, Mercedes; Fernández Arteaga, Jesús; Rodríguez Mellado, José Miguel (American Chemical Society, 2014)The anodic oxidation of mercury in the presence of hydrogen peroxide in differential pulse voltammetry (DPV) was used to determine the antioxidant (AO) character of radical scavengers. Hydroperoxide radical is formed at ... -
Determination of booster biocides in sediments by focused ultrasoundassisted extraction and stir bar sorptive extraction–thermal desorption–gas chromatography–mass spectrometry
García Lorenzo, Elisa; Giráldez Díaz, Inmaculada; Ruiz Montoya, Mercedes; Morales Carrillo de Albornoz, Emilio (Elsevier, 2020)Booster biocides present in natural waters may be captured by the sediments. Highly sensitive, robust, selective and reliable analytical methods are required to evaluate their presence in the sediments. A focused ultrasound ... -
Effect of autohydrolysis on hemicellulose extraction and pyrolytic hydrogen production from Eucalyptus urograndis
Loaiza Rodríguez, Javier Mauricio; Palma López, Alberto; Díaz Blanco, Manuel Jesús; Ruiz Montoya, Mercedes; García Domínguez, María Trinidad; García Domínguez, Juan Carlos (Springer, 2020-07)Ensuring environmental and social-economic sustainability in the use of materials from lignocellulosic biomass requires their fractionation and valorization of their main components. In this work, we used Eucalyptus ... -
Electrochemical Determination of Glyphosate in Waters Using Electrogenerated Copper Ions
Pintado, Sara; Ruiz Montoya, Mercedes; Rodríguez Amaro, Rafael; Mayén, Manuel; Rodríguez Mellado, José Miguel (ESG, 2012)Carbon electrodes with in situ electrodeposited copper are used to the determination of Glyphosate (N-(phosphonomethyl) glycine) in drinking waters. The oxidation signal to form Cu(II) ions is enhanced after the addition ... -
Electrochemical oxidation of isothiazolinone biocides and their interaction with cysteine
Ruiz Montoya, Mercedes; Giráldez Díaz, Inmaculada; Morales Carrillo de Albornoz, Emilio; Estévez Brito, Rafael; Rodríguez Mellado, José Miguel (Elsevier, 2020)This paper presents voltammetric studies on carbon electrodes (linear-sweep cyclic voltammetry and differencial pulse voltammetry) on the electrooxidation of methylisothiazolinone (MIT), Chloromethylisothiazolinone (CMIT) ... -
Electrochemical Oxidation Pathways of Hydroxycoumarins on Carbon Electrodes Examined by LSCV and LC–MS/MS
Estévez Brito, Rafael; Priego Capote, F.; Ledesma Escobar, C. A.; Ruiz Montoya, Mercedes; Rodríguez Mellado, José Miguel (The Electrochemical Society, 2019-05-03)It is reported the voltammetric behavior and the identification of the oxidation products of four different hydroxycoumarins, namely, 3-, 4-, 6- and 7-hydroxycoumarin (3HC, 4HC, 6HC and 7HC), on carbon electrodes by ... -
Elucidation of the Electrochemical Oxidation Mechanism of the Antioxidant Sesamol on a Glassy Carbon Electrode
Estévez Brito, Rafael; Rodríguez Mellado, José Miguel; Maldonado, Pilar; Ruiz Montoya, Mercedes; Palma López, Alberto; Morales Carrillo de Albornoz, Emilio (The Electrochemical Society, 2014-03-13)The dissociation constant of Sesamol (5-hydroxy-1,3-benzodioxol) was determined from the dependence of the UV-visible spectra with the medium acidity. A pK value of 10.1 ± 0.1, corresponding to the hydroxyl group, was ... -
Energetic valorization of MSW compost valorization by selecting the maturity conditions.
Doña Grimaldi, Victor; Palma López, Alberto; Ruiz Montoya, Mercedes; Morales Carrillo de Albornoz, Emilio; Díaz Blanco, Manuel Jesús (Elsevier, 2019-03)MSW compost valorization under combustion, at two different composting process conditions, have been studied by thermogravimetric analysis (TGA). The composting operating parameters such as aeration and moisture affect the ... -
Evaluation of synergistic and antagonistic effects between some selected antioxidants by means of an electrochemical technique
Palma López, Alberto; Ruiz Montoya, Mercedes; Díaz Blanco, Manuel Jesús; Fernández Arteaga, Jesús; Estévez Brito, Rafael; Rodríguez Mellado, José Miguel (Wiley, 2017-02-21)This work presents a systematic study of the possible interactions in mixtures of the natural antioxidants eugenol, thymol, sesamol and limonene. The antioxidant capacity is measured from the decrease of the DPV signal ... -
Influence of Cellulose Characteristics on Pyrolysis Suitability
Eugenio, María Eugenia; Ruiz Montoya, Mercedes; Martín Sampedro, Raquel; Ibarra, David; Díaz Blanco, Manuel Jesús (MDPI, 2021): Cellulose is the most abundant component of biomass and the one that requires the most activation energy (Ea) for pyrolysis. In this study, the dependence of Ea on the intrinsic cellulose characteristics, such as the ... -
Influencia de las variables de operación en la composición de los Compuestos Orgánicos Volátiles generadores de olor emitidos en el compostaje de RSU
Delgado Rodríguez, Margarita; Cabeza, I. O.; Ruiz Montoya, Mercedes; Giráldez Díaz, Inmaculada; López, Rafael; Madejón Rodríguez, Engracia; Díaz Blanco, Manuel Jesús (Olores.org, 2012)En el presente estudio se ha evaluado la influencia de los parámetros de control utilizados en el compostaje de Residuos Sólidos Urbanos (RSU), como son la aireación (0.05-0.300 Laire kg-1 min-1) y la humedad (40-70%) en ... -
Kinetic synergistic effect in co-pyrolysis of Eucalyptus globulus with high and low density polyethylene
Ruiz Montoya, Mercedes; Palma López, Alberto; Lozano Calvo, Susana; Morales Carrillo de Albornoz, Emilio; Díaz Blanco, Manuel Jesús (Elsevier, 2022-08-13)The pyrolysis of Eucalyptus globulus (EG) with different blends of high density polyethylene (HDPE) and low density polyethylene (LDPE) by thermogravimetry has been studied. ASTM-E1641-16 standard method has been used to ... -
Mechanism of Mercury Electrooxidation in the Presence of Hydrogen Peroxide and Antioxidants
Estévez Brito, Rafael; Rodríguez Mellado, José Miguel; Palma López, Alberto; Ruiz Montoya, Mercedes; Fernández Arteaga, Jesús (The Electrochemical Society, 2014-09-18)The oxidation process occurring on mercury electrodes in the presence of hydrogen peroxide has been analized in basic solutions by polarography and voltammetry in their linear scan and differential pulse modes. The process ...