21 research outputs found
Dataset of the work “Normal or parallel configuration in spectroelectrochemistry? Bidimensional spectroelectroanalysis in presence of an antioxidant compound”
No full textThis work demonstrates how the way a chemical system is sampled plays a key role in spectroelectroanalysis, illustrated by the quantification of an analyte in presence of an antioxidant compound. For this purpose, bidimensional spectroelectrochemistry experiments were performed using epinephrine as the model analyte and ascorbic acid as antioxidant and interfering compound, as a proof of concept. This is the first time that three calibration curves are obtained simultaneously on a single spectroelectrochemistry data set, one for the electrochemical signal and two for the optical responses in normal and parallel configurations. The differences between the two optical arrangements, that are related to the diffusion process which is an essential feature for the spectroelectrochemical detection of compounds, have been experimentally demonstrated. As can be observed, the spectral signal in parallel configuration allows us to obtain the best analytical results, since in this configuration only the first micrometers of the solution adjacent to the electrode surface are sampled, thus removing the interfering effect of the antioxidant compound. This fact does not occur with either the electrochemical signal or the spectral response in normal configuration. Furthermore, it has been shown that the parallel configuration provides better results than the normal configuration in terms of sensitivity. In summary, epinephrine is successfully detected in a simple and effective way, even in the presence of a direct antioxidant compound such as ascorbic acid at different concentrations levels, which makes spectroelectrochemistry a good choice for quantitative analysis.Authors acknowledge the financial support given by Ministerio de Ciencia e Innovación and Agencia Estatal de Investigacion (MCIN/AEI/ 10.13039/501100011033, PID2020-113154RB-C21) and Ministerio de Ciencia, Innovacion y Universidades (Grant RED2018-102412-T). Fabiola Olmo is grateful for the contract funded by Junta de Castilla y Leon, the European Social Fund, and the Youth Employment Initiative
Normal or parallel configuration in spectroelectrochemistry? Bidimensional spectroelectroanalysis in presence of an antioxidant compound
No full textThis work demonstrates how the way a chemical system is sampled plays a key role in spectroelectroanalysis, illustrated by the quantification of an analyte in presence of an antioxidant compound. For this purpose, bidimensional spectroelectrochemistry experiments were performed using epinephrine as the model analyte and ascorbic acid as antioxidant and interfering compound, as a proof of concept. This is the first time that three calibration curves are obtained simultaneously on a single spectroelectrochemistry data set, one for the electrochemical signal and two for the optical responses in normal and parallel configurations. The differences between the two optical arrangements, that are related to the diffusion process which is an essential feature for the spectroelectrochemical detection of compounds, have been experimentally demonstrated. As can be observed, the spectral signal in parallel configuration allows us to obtain the best analytical results, since in this configuration only the first micrometers of the solution adjacent to the electrode surface are sampled, thus removing the interfering effect of the antioxidant compound. This fact does not occur with either the electrochemical signal or the spectral response in normal configuration. Furthermore, it has been shown that the parallel configuration provides better results than the normal configuration in terms of sensitivity. In summary, epinephrine is successfully detected in a simple and effective way, even in the presence of a direct antioxidant compound such as ascorbic acid at different concentrations levels, which makes spectroelectrochemistry a good choice for quantitative analysis.Authors acknowledge the financial support given by Ministerio de Ciencia e Innovación and Agencia Estatal de Investigación (MCIN/AEI/ 10.13039/501100011033, PID2020-113154RB-C21) and Ministerio de Ciencia, Innovación y Universidades (Grant RED2018-102412-T). Fabiola Olmo is grateful for the contract funded by Junta de Castilla y León, the European Social Fund, and the Youth Employment Initiative
Spectroelectrochemistry techniques applied to chemical analysis
No full textLa presente tesis doctoral describe diversos avances significativos de la espectroelectroquímica. Desde sus inicios, en los que sólo obtener una respuesta óptica relacionada con un proceso electroquímico suponía un avance significativo en la comprensión del proceso electródico, hasta este trabajo, en el que se obtienen respuestas ópticas con muy elevada reproducibilidad. En la tesis se demuestra el gran avance de la espectroelectroquímica, pasando de ser una técnica de caracterización hasta convertirse en una técnica analítica fiable y prometedora. Se presentan diversos estudios en los cuales se ha conseguido cuantificar de modo muy reproducible compuestos de interés biológico en matrices complejas, permitiendo resolver mezclas multicomponente sin necesidad de separaciones previas. Además, se han llevado a cabo experimentos espectroelectroquímicos combinando simultáneamente tres técnicas espectroscópicas, obteniendo cuatro respuestas de distinta naturaleza en un único experimento. Esta combinación de técnicas espectroelectroquímicas proporciona una gran cantidad de información sobre el estudio de los sistemas químicos.This doctoral thesis describes several significant advances in spectroelectrochemistry. From its beginnings, in which only obtaining an optical response related to an electrochemical process meant a significant advance in the understanding of the electrochemical process, to this work, in which optical responses with very high reproducibility are obtained. The thesis demonstrates the great progress of spectroelectrochemistry, from being a characterization technique to becoming a reliable and promising analytical technique. Several studies are presented in which compounds of biological interest in complex matrices have been quantified in a very reproducible way, allowing the resolution of multicomponent mixtures without the need of previous separations. In addition, spectroelectrochemical experiments have been carried out combining simultaneously three spectroscopic techniques, obtaining four responses of different nature in a single experiment. This combination of spectroelectrochemical techniques provides a wealth of information on the study of chemical systems.Programa de Doctorado en Química Avanzad
Dataset of the work “Determination of ofloxacin in urine using UV/Vis absorption spectroelectrochemistry”
No full textUV–Vis absorption spectroelectrochemistry has been selected as a suitable multiresponse technique to determine the fluoroquinolone ofloxacin in urine samples without any previous pretreatment. Due to the modification of the working electrode surface during the oxidation of this antibiotic, the electrode has to be replaced or polished between measurements. A new spectroelectrochemistry cell has been developed, which allows in a simple way to perform reproducible experiments with different screen-printed electrodes. The new cell has been used to perform analysis in a complex matrix such as urine. Due to the trilinear character of the spectroelectrochemical data, PARAFAC has been used to determine ofloxacin with very good figures of merit, demonstrating the capability of trilinear methods to avoid the influence of some interfering compounds.Ministerio de Ciencia e Innovación and Agencia Estatal de Investigación (Grant numbers: MCIN/AEI/10.13039/501100011033, PID2020-113154RB-C21), Ministerio de Ciencia, Innovación y Universidades (Grant number: RED2022-134120-T), Junta de Castilla y León and European Regional Development Fund (Grant number: BU036P23) are gratefully acknowledged for funding this work. F.O. acknowledges Junta de Castilla y León and European Social Found for his predoctoral contract
Determination of ofloxacin in urine using UV/Vis absorption spectroelectrochemistry
No full textUV–Vis absorption spectroelectrochemistry has been selected as a suitable multiresponse technique to determine
the fluoroquinolone ofloxacin in urine samples without any previous pretreatment. Due to the modification of the
working electrode surface during the oxidation of this antibiotic, the electrode has to be replaced or polished
between measurements. A new spectroelectrochemistry cell has been developed, which allows in an simple way
to perform reproducible experiments with different screen-printed electrodes. The new cell has been used to
perform analysis in a complex matrix such as urine. Due to the trilinear character of the spectroelectrochemical
data, PARAFAC has been used to determine ofloxacin with very good figures of merit, demonstrating the
capability of trilinear methods to avoid the influence of some interfering compounds.Ministerio de Ciencia e Innovacion ´ and Agencia Estatal de Inves tigacion ´ (Grant numbers: MCIN/AEI/10.13039/501100011033, PID2020-113154RB-C21), Ministerio de Ciencia, Innovacion ´ y Uni versidades (Grant number: RED2022-134120-T), Junta de Castilla y Leon ´ and European Regional Development Fund (Grant number: BU036P23) are gratefully acknowledged for funding this work
Dataset of the work “UV Vis absorption spectroelectrochemistry of folic acid”
No full textUV/Vis absorption spectroelectrochemistry is a very promising analytical technique due to the complementary information that is simultaneously obtained from electrochemistry and spectroscopy. In this work, this technique is used in a parallel configuration to study the oxidation of folic acid in alkaline medium. Herein, UV/Vis absorption spectroelectrochemistry has been used to detect both the oxidation products and the folic acid consumed at the electrode/solution interface, allowing us to develop an analytical protocol to quantify vitamin B9 in pharmaceutical tablets. Linear ranges of three orders of magnitude have been achieved in basic medium (pH = 12.9), obtaining high repeatability and low detection limits. The spectroelectrochemical determination of folic acid in pharmaceutical tablets at alkaline pH values is particularly interesting because of the changes that occur in the optical signal during the electrochemical oxidation of FA, providing results with very good figures of merit and demonstrating the utility and versatility of this hyphenated technique, UV/Vis absorption spectroelectrochemistry.Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. Authors acknowledge the financial support from Ministerio de Economía y Competitividad (Grant CTQ2017-83935-R-AEI/FEDERUE), Junta de Castilla y León (Grant BU297P18), and Ministerio de Ciencia, Innovación y Universidades (Grant RED2018-102412-T). F.O. is grateful for the contract funded by Junta de Castilla y León, the European Social Fund, and the Youth Employment Initiative
UV/Vis absorption spectroelectrochemistry of folic acid
No full textUV/Vis absorption spectroelectrochemistry is a very promising analytical technique due to the complementary information
that is simultaneously obtained from electrochemistry and spectroscopy. In this work, this technique is used in a parallel
configuration to study the oxidation of folic acid in alkaline medium. Herein, UV/Vis absorption spectroelectrochemistry
has been used to detect both the oxidation products and the folic acid consumed at the electrode/solution interface, allowing
us to develop an analytical protocol to quantify vitamin B9 in pharmaceutical tablets. Linear ranges of three orders of
magnitude have been achieved in basic medium (pH = 12.9), obtaining high repeatability and low detection limits. The
spectroelectrochemical determination of folic acid in pharmaceutical tablets at alkaline pH values is particularly interesting
because of the changes that occur in the optical signal during the electrochemical oxidation of FA, providing results with
very good figures of merit and demonstrating the utility and versatility of this hyphenated technique, UV/Vis absorption
spectroelectrochemistry.Ministerio de Economía y Competitividad (Grant
CTQ2017-83935-R-AEI/FEDERUE), Junta de Castilla y León (Grant
BU297P18), and Ministerio de Ciencia, Innovación y Universidades
(Grant RED2018-102412-T). F.O. is grateful for the contract funded
by Junta de Castilla y León, the European Social Fund, and the Youth
Employment Initiative.Publicación en abierto financiada por el Consorcio de Bibliotecas Universitarias de Castilla y León (BUCLE), con cargo al Programa Operativo 2014ES16RFOP009 FEDER 2014-2020 DE CASTILLA Y LEÓN, Actuación:20007-CL - Apoyo Consorcio BUCL
Derivative UV/Vis spectroelectrochemistry in a thin-layer regime: deconvolution and simultaneous quantification of ascorbic acid, dopamine and uric acid
No full textIn this work, UV/Vis spectroelectrochemistry (SEC), in a thin-layer regime and parallel configuration, is selected to solve a
complex mixture that contains dopamine (DA), ascorbic acid (AA) and uric acid (UA). These molecules, like many other
biological compounds, are assuming a highly important place in analytical and biomedical fields due to the fundamental role
that they play in human metabolism. In addition, low or high levels of these compounds are associated with diseases such as
Parkinson’s disease. For this reason, the quantification of these biomolecules is becoming increasingly critical. However, some
drawbacks must be overcome, because the three molecules coexist in the human body, and the species are subject to mutual
interference. In fact, they are all oxidized at similar potentials, and their UV/Vis absorption bands overlap, greatly complicating
their quantification. For this reason, derivative SEC together with suitable chemometric tools such as PARAFAC are proposed to
solve this complex matrix. This technique allows us to separate the contribution of each of these molecules present in a sample
and to quantify all of them, achieving high resolution and reproducibility. Besides, detection limits at the micromolar level are
achieved for DA, AA and UA in mixture solutions. This work thus demonstrates the great potential for derivative potentiodynamic
SEC combined with the appropriate chemometric tools in solving complex mixtures, a field where SEC is still taking the
first steps.Ministerio de Economía y Competitividad (Grants CTQ2017-83935-RAEI/
FEDER, UE), Junta de Castilla y León (Grant BU297P18) and
Ministerio de Ciencia, Innovación y Universidades (RED2018-102412-
T). F.O. is grateful for the contract funded by Junta de Castilla y León, the
European Social Fund and the Youth Employment Initiative. J.G.R.
thanks theMinisterio de Economía y Competitividad for his postdoctoral
contract (CTQ2017-83935-R AEI/FEDER, UE)
Spectroelectrochemical Determination of Isoprenaline in a Pharmaceutical Sample
No full textUV/Vis absorption spectroelectrochemistry (SEC) is a multi-response technique that has
been commonly used for the characterization of materials and the study of reaction mechanisms.
However, it has been scarcely used for quantitative purposes. SEC allows us to obtain two analytical
signals simultaneously, yielding a dual sensor in just one experiment. In the last years, our group
has developed new devices useful for analysis. In this work, a SEC device in parallel configuration,
based on optical fibers fixed on screen-printed electrodes, was used to determine isoprenaline
in a commercial drug, using both, the electrochemical and the spectroscopic signals. In this
commercial drug, isoprenaline is accompanied in solution by other compounds. Among them is
sodium metabisulfite, an antioxidant that strongly interferes in the isoprenaline determination. A
simple pretreatment of the drug sample by bubbling wet-air allows us to avoid the interference of
metabisulfite. Here, we demonstrate again the capabilities of UV/Vis absorption SEC as double sensor
for analysis and we propose a simple pretreatment to remove interfering compounds.Ministerio de Economía y Competitividad (Grant CTQ2017-83935-R-AEI/FEDERUE), Junta de Castilla y León (Grant BU297P18), and Ministerio de Ciencia, Innovación y Universidades (Grant RED2018-102412-T). F.O. is grateful for the contract funded by Junta de Castilla y León, the European Social Fund and the Youth Employment Initiative. J.G.R. thanks Ministerio de Economía y Competitividad for his postdoctoral contract (Grant CTQ2017-83935-R AEI/FEDER, UE)
Museo Regional de Guadalajara Hacia su Centenario 1918-2018: Regiones Culturales Sur, Norte, Costa y Centro
No full text- Prólogo por Roberto Velasco Alonso. – Introducción por Daniel Ruiz Cancino y Ricardo Ortega González. - Conferencia magistral I. "Dos regiones, dos culturas, dos identidades: Los Altos y el Sur de Jalisco" por Guillermo de la Peña. - Conferencia magistral II. "Identidad a partir del patrimonio. El INAH 1939-2000" por Aída Montes de Oca Hernández. - Mesa 1. Organización económica y social en la Nueva Galicia y sus relaciones con las otras provincias: - "No juraremos la Constitución". El intento del cabildo eclesiástico por revertir el artículo séptimo de la Constitución de Jalisco, 1824 por Paulina Gutiérrez Sánchez. - Las unidades productivas de los condes de Miravalle en la Provincia de Nayarit (1644-1713) por Liliana Judith Vizcaíno Monroy. - Reformas en la ciudad: orden, urbanización y saneamiento en Guadalajara durante el siglo XVIII por María Guadalupe Candelas Granados. - Mesa 3. Procesos de conquista y resistencia: - La resistencia a la conquista espiritual de las comunidades wixarikaria través de la correspondencia de religiosos franciscanos en el siglo XIX por Lourdes Celina Vázquez Parada. - En este pueblo sí hay indígenas, los nahuas del sur de Jalisco por Luis Gabriel Hernández Valencia. - El náhuatl en el estado de Jalisco. La pérdida de la identidad por Victoriano de la Cruz Cruz. – Mesa 4. Periodo prehispánico y sus características medioambientales II: - La tradición constructiva en el Clásico terminal en el Valle de Atemajac, Jalisco por Elizabeth Rangel Roque. – Mesa 5. Organización económica y social en la Nueva Galicia y sus relaciones con las otras provincias II: - La sombra de la Santísima Cruz en las misiones jesuitas del septentrión por Guillermo García Mar. - Lucha de la orden agustina para poderse asentar en Guadalajara por Yamit Rodríguez Pérez. - Continuidades y cambios en torno a la producción, la venta y el consumo de bebidas embriagantes en la Nueva España con las reformas borbónicas por Betania Rodríguez Pérez. - El noble arte de la platería en la Nueva Galicia por Ricardo Cruzaley Herrera. - La Vuelta del Poniente: una proeza marítima, neogallega, que comunicó a la Nueva España con Filipinas por Fabián Acosta Rico. - Mesa 7. Patrimonio cultural y el desarrollo urbano/Historia sociocultural: - Peligro en la morada. El robo domiciliado en Jalisco, 1846-1861 por Sebastián Porfirio Herrera Guevara. - Las transformaciones de la Penitenciaría de Escobedo durante la Intervención Francesa y el Segundo Imperio en Guadalajara (1864-1866) por lván Segura Muñoz. – Mesa 8. Patrimonio cultural y el desarrollo urbano/Arquitectura II: - Arquitectura de bajareque, en el sureste de Jalisco por Diego Antonio Toscano Alcántar. – Mesa 9. Patrimonio cultural y el desarrollo urbano/Artes plásticas: - Antonio Enríquez. Su obra pictórica en las regiones culturales de Jalisco por Alena Robin. - Mesa 10. Patrimonio cultural y el desarrollo urbano/Temas diversos I: - Importancia de la microhistoria en la preservación del patrimonio cultural e histórico. La Casa Museo de Doña Conchita Encarnación. San Sebastián del Oeste, Jalisco por Raúl Fabricio Torres M. - La Museografía. Comunicadora de los discursos curatoriales María de Guadalupe Núñez Figueroa y Ana Laura Treja Martín. - Conservar, documentar y difundir por Elián Elizabeth Orozco Ríos. - El coleccionismo de obras artísticas: un acercamiento al Museo de Arte Peter Gray de Puerto Vallarta, Jalisco por María del Pilar Herrera Guevara y Carlos W. Haro Reyes. - Mesa 11. Patrimonio cultural y el desarrollo urbano/Territorio e Identidad: - Las estrategias de vida de mujeres zapotecas del Istmo de Tehuantepec en la Zona Metropolitana de Guadalajara - ZMG: Na' Amelia, un estudio de caso por Fabiola Sevilla Hernández. - Ser indígena en Mezcala, una comunidad del occidente de México por Santiago Bastos. - La fiesta de "La Cruz" como parte del patrimonio cultural local de Mezcala de la Asunción, Jalisco por Carolina Benítez. - Mesa 12. Patrimonio cultural y el desarrollo urbano/Temas diversos II: - "Entre intangibilidad y materialidad: las revistas Eos y Pan y sus espacios de desarrollo (1943-1946)" por Francisco Joel Guzmán Anguiano. - Cultura artística y educación estética a favor del desarrollo de la cultura artística de la sociedad por Brahiman Saganogo. - Los imaginarios en torno al músico jalisciense Clemente Aguirre, consolidación simbólica e identidad por Eduardo Escoto Robledo. - Mesa 13. Patrimonio cultural y el desarrollo urbano/Territorio e Identidad II: - La fiesta patronal "entre-medio" institucional e identidad comunitaria: producción cultural en San Francisco Tesistán por Samuel Hernández Vásquez. - Mesa 14. Patrimonio cultural y el desarrollo urbano/Producción Artesanal: - Loza de Sayula, el devenir de un arte cerámico: reapropiación y reproducción del patrimonio cultural por Ricardo Cortez Guzmán. - Los maestros escultores en barro de San Pedro Tlaquepaque y Tonalá, Jalisco por lsaías Hernández Estrada. - Resumen curricular.Conjugar, agrupar, asociar, no siempre resulta fácil… y menos en cuestiones tan vastas como es lo cultural. Esto es lo que ha logrado el Coloquio del Museo Regional de Guadalajara a lo largo de sus emisiones, consolidándose en este, su tercer encuentro; donde investigadores emergentes y con experiencia comparten visiones de temas tan fascinantes como complejos de la historia cultural y social de Jalisco. Dentro de este volumen se encuentran 16 disertaciones que muestran esa gran variedad de Jalisco, no sólo dentro de su territorio, sino en la interacción con sus regiones vecinas. Así en el marco del centenario del MRG la actividad académica se refuerza, crece y se convierte en lugar de encuentro de diversas instituciones académicas del país
