Facultad Regional Córdoba
Permanent URI for this communityhttp://48.217.138.120/handle/20.500.12272/94
Browse
1265 results
Search Results
Item Mesoporous materials funtionalized with noble metals for bio-oil treatment.(Universidad Tecnológica Nacional Regional Córdoba., 2017) Rivoira , Lorena Paola; Martínez , María Laura; Beltramone, Andrea Raquel; Beltramone, Andrea Raquel; Martínez , María LauraBio-oil obtained by pyrolysis of biomass can be consider as a renewable petroleum alternative. Liquid fuel obtained by this process presents high oxygen content, becoming into a corrosive and unstable fuel. Hydrodeoxygenation (HDO) is a catalytic treatment that improves the bio-oil characteristics. There are more than 400 organic compounds that can be found in bio-oil. For that reason we selected guayacol (2-methoxyphenol ó 4-hydroxy-3-methoxybenzyl) as model compound to test the catalytic activity of the developed catalysts. The catalysts tested for hydrodeoxygenation (HDO) of guayacol to produce deoxygenated products such as benzene, toluene, ciclohexene and ciclohexane were platinum modified mesoporous SBA-15 and Ga-SBA-15. The synthetized catalysts were obtained by sol-gel method. Active platinum sites were incorporated by wet impregnation. The system reaction used for HDO is a 600 mL stirred autoclave (Parr Pressure Reactor 4536). Reaction conditions were carried out at 230°C and 12 atm of H2 under 500 rpm. Reactor feed consisted in 50 mL of a 1% w/v solution of guayacol in dodecane. Then, 200 mg of the catalyst was transferred to the reactor. Samples were taken every hour. Products were analysed with HP Series II GC and HP-5 capillary column and identified by GC/MS.Item Preparation, charactrization and mathematical modeling of keterolac reléase conteined in LP-SBA-15 host.(Universidad Tecnológica Nacional Regional Córdoba., 2017) Cussa , Jorgelina; Juárez , Juliana María; Gómez Costa, Marcos Bruno; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaDrug-controlled release systems can keep the level of drugs in precise doses in the body above the optimal level and with low toxicity. We propose the LP-SBA-15 nanomaterial as a promising new host for drug delivery systems because of its high biocompatibility, in vivo biodegradability, and low toxicity. Ketorolac-LP-SBA-15 was prepared and characterized by XRD, FTIR, UV-Vis DRS, TEM, and texture analysis, determining the adsorption capacity and its release, achieving the required therapeutic efficacy. The host shows ordered mesoporous nanochannels with a diameter of 11-12 nm, maintaining the structure with the incorporation of Keto. The mechanism of drug release the LP-SBA-15 host was evaluated. Different mathematical models were used to adjust the experimental data, being the Ritger-Peppas model followed by the Weibull model the best ones. In this work, we show a promising drug storage material for effective encapsulation and controlled release of KETO, achieving the required therapeutic efficacy. Studies indicate that KETO was adsorbed on the channel surface of LP-SBA-15 without affecting the structure or chemical composition of KETO. Controlled drug delivery systems can achieve precise delivery at the time and place of destination, keeping the concentration of the drug at points in the body within the optimal range and below the toxicity threshold. The study also demonstrates the storage capacity and release properties of LP SBA-15 containing KETO. The release of KETO contained in LP-SBA-15 can offer a significant improvement in the controlled release of the drug and the analgesic and anti-inflammatory effects, positively influenced, by the links formed between the host and drug molecules and by diffusion through the host porosity. The promising results we obtained for the release of the drug thoroughly using the new material, reaching a rapid initial release rate, and maintaining a constant rate afterward, allow us to maintain the concentration of the drug in the therapeutic efficacy range, applying it largely to the treatment of diseases that require a rapid response.Item KETO/LP-SBA-15 Composite as a drug release system.(Universidad Tecnológica Nacional Regional Córdoba., 2017) Cussa , Jorgelina; Juárez , Juliana María; Prados, Antonela; Gómez Costa, Marcos Bruno; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaControlled drug delivery systems can maintain the concentration of drugs in the exact sites of the body within the optimum range and below the toxicity threshold, improving therapeutic efficacy and reducing toxicity. SBA-15 with larger pore sizes material (LP-SBA-15) is a new promising host for drug delivery systems due to high biocompatibility, in vivo biodegradability and low toxicity. Large pore mesoporous silica supports has been applied in studies of ketorolac tromethamine (KETO) adsorption and release. KETO/LP-SBA-15 composite was synthesized. The material synthesis and loading of KETO into LP-SBA-15 pores were successful. We obtained promising results for controlled drug release using the novel LP-SBA-15 material. The ability of KETO/LP-SBA-15 release was measured. The concentration of KETO in HCl solution or buffer in a specific time was determined by UV-Vis. First-order, Higuchi and Ritger-Peppas (or Korsmeyer-Peppas) models were used to fit experimental release data. Figure 1 show the fitting results, where Qt/Q? is the release fraction per unit mass in time t, k represents release rate in all models and n is a measure of desorption intensity in Ritger-Peppas regression. In this work, we have shown a promising drug storage material for the effective encapsulation and controlled release of KETO, achieving the required therapeutic efficacy. KETO was adsorbed into LP-SBA-15 channel surface without affecting the chemical structure or composition of KETO. The study also demonstrates the storage capacity and release properties of LP-SBA-15 containing KETO. The release of KETO contained in LP-SBA-15 can offer significant improve in controlled drug release and enhance a good analgesia effect.Item Ketorolac-trometamina/mcf: aplicación en sistemas de liberación de fármacos.(Universidad Tecnológica Nacional Regional Córdoba., 2018) Cussa , jorgelina; Juárez , Juliana María; Prados, Antonela; Gómez Costa, Marcos Bruno; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaEn los últimos años, la atención se ha dirigido significativamente a la nanociencia y la nanotecnología. La administración de fármacos basados en nanomateriales se ha puesto en relieve por los investigadores académicos e industriales. Diversos materiales nanoestructurados se produjeron y se aplican a la administración de fármacos tales como nanopartículas, nanocápsulas, nanotubos, micelas, microemulsiones y liposomas (Wu et al., 2011). Los sistemas de liberación controlada de fármacos pueden lograr la entrega espacial y temporal precisa de agentes terapéuticos al sitio de destino. Generalmente, los sistemas de administración de fármacos controlada pueden mantener la concentración de fármacos en los sitios precisos del cuerpo dentro de la gama óptima y bajo el umbral de toxicidad, mejorar la eficacia terapéutica y reducir la toxicidad (Wang, 2009). Un sistema de administración de fármacos se puede definir como un sistema capaz de liberar un agente bioactivo portador en una ubicación específica a una velocidad específica. El objetivo principal de este tipo de sistema es la de facilitar la dosificación y la duración del efecto del fármaco, minimizando el daño al paciente y mejorar la salud humana, ya que permiten la reducción de la frecuencia de la dosis (Wang, 2009).Item Composite MCF/KETO. Aplicación en sistemas de liberación de fármacos.(Universidad Tecnológica Nacional Regional Córdoba., 2019) Cussa , jorgelina; Juárez , Juliana María; Prados, Antonela; Gómez Costa, Marcos Bruno; Juárez , Juliana MaríaLa espuma celular mesoestructurada (MCF) es un prometedor material para los sistemas de administración de fármacos dado a la alta biocompatibilidad, biodegradabilidad y baja toxicidad. Sus propiedades incluyen una gran área superficial, poro grande uniforme. En este trabajo, MCF como material de almacenamiento de drogas fue sintetizado con éxito y cargado con la droga ketorolaco-trometamina, obteniendo el composite MCF/ KETO. La síntesis del material y el proceso de carga de ketorolaco-trometamina en los poros de la MCF fueron exitosos tal como se muestra en los análisis de XRD, FTIR, TGA, TEM y texturales. Hemos obtenido resultados prometedores para la liberación controlada de fármacos utilizando el noble material MCF. La aplicación de estos materiales en la liberación de KETO es innovadora, logrando una alta tasa de liberación inicial y manteniendo una tasa constante en los tiempos altos.Item Nanocomposite aplicados a la liberación controlada de fármacos.(Universidad Tecnológica Nacional Regional Córdoba., 2020) Cussa, Jorgelina; Prados, Antonella; Gómez Costa , Marcos Bruno; Juárez , Juliana María; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaLas nanomedicinas terapéuticas pueden transportar Principio Activo (PA) hasta los tejidos patológicos, consiguiendo que las células enfermas reciban una gran descarga de PA y disminuyendo el acceso del PA sobre las células sanas. El objetivo principal de este estudio es determinar la capacidad adsorción y las propiedades de almacenamiento de la LP-SBA 15/KETO y la liberación logrando la eficacia terapéutica requeridaItem LP-SBA-15/Ketorolac Nanocomposite: Development, Characterization, and Mathematical Modeling of Controlled Keto Release.(Universidad Tecnológica Nacional Regional Córdoba., 2023) Cussa, Jorgelina; Juárez , Juliana María; Gómez Costa, Marcos Bruno; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaDrug-controlled release systems can keep the level of drugs in precise doses in the body above the optimal level and with low toxicity. We propose the nanomaterial LP-SBA-15 as an attractive new host for drug delivery systems due to its high biocompatibility, in vivo biodegradability, and low toxicity. LP-SBA-15/Ketorolac was prepared and characterized by XRD, FTIR, UV-Vis DRS, TEM, and texture analysis, determining the adsorption capacity and its release and achieving the required therapeutic efficacy. The host shows the ordered mesoporous nanochannels with a diameter of 11-12 nm, maintaining the structure with the incorporation of Keto. The mechanism of drug release from the LP-SBA-15 host was evaluated. Different mathematical models were used to adjust the experimental data, the Ritger-Peppas model followed by the Weibull model the best ones. The promising results we obtained for the release of the drug thoroughly using the new material, reaching a rapid initial release rate, and maintaining a constant rate afterward, allow us to maintain the concentration of the drug in the therapeutic efficacy range, applying it largely to the treatment of diseases that require a rapid responseItem Bimetallic platinum/iridium modified mesoporous catalysts applied in the hydrogenation of HMF.(Universidad Tecnológica Nacional Regional Córdoba., 2018) Ledesma , Brenda Cecilia; Juárez , Juliana María; Beltramone , Andrea Raquel; Beltramone , Andrea Raquel; Juárez , Juliana MaríaThe catalytic transformation of 5-hydroxymethylfurfural (HMF) to produce 2,5-dimethylfuran (DMF) was studied over bimetallic (PtIr) and monometallic (Pt) catalysts supported on CMK-3 and SBA-15 mesoporous materials. The optimum temperature and pressure for the maximum production of DMF were 120° and 15 atm. Increases in temperature and pressure decreased the selectivity to DMF. The catalysts were broadly characterized by XRD, N2-isotherms, XPS, TPR, TEM and NH3-TPD. It was found that the metal particles were well reduced and highly dispersed on the surface of the support of large surface area and narrow pore distribution. The PtIr alloy species active sites were very active and selective towards the formation of the desired DMF. PtIr-CMK-3 showed an excellent activity, selectivity and stability to be applied in this process.Item HDT del modelo de alimentación diesel sobre catalizadores Zr-SBA-15 modificados con Ir.(Universidad Tecnológica Nacional Regional Córdoba., 2019) Vallés , Verónica Alejandra; Yanika , Sa-ngasaeng; Martínez , María Laura; Siriporn, Jongpatiwut; Beltramone, Andrea Raquel; Beltramone, Andrea RaquelCatalizadores de iridio con diferentes soportes de SBA-15 modificados con circonio se probaron en el HDT de tetralin y los compuestos típicos de azufre presentes en la alimentación de diesel. Los soportes se sintetizaron mediante el método sol-gel utilizando dos fuentes de circonio, cloruro de circonilo y propóxido de circonio (IV). El circonio se incorporó principalmente como especies tetraédricas de Zr+4 . El NH3-TPD de los catalizadores mostró una mayor acidez cuando están presentes las especies tetraédricas de Zr+ 4 . Entre los catalizadores preparados, el catalizador sintetizado utilizando propóxido de circonio y ácido láctico presentó la dispersión más alta y el tamaño de cluster más bajo. En consecuencia, este fue el catalizador más activo para la hidrogenación de tetralina y la HDS de dibenzotiofeno (DBT) y 4,6-dimetildibenzotiofeno (4,6-DMDBT). La presencia de Zr+4 tuvo un efecto notable en la capacidad de dispersión de las partículas de Ir. Además, la presencia de acidez moderada en este material proporciona el mejor catalizador para HDS en las condiciones estudiadas, lo que hace que sea un catalizador potencial para la reacción de HDT en condiciones suavesItem Catalizadores bimetálicos Platino/Iridio sobre soportes mesoporosos aplicados en la hidrogenación de HMF para la obtención de DMF.(Universidad Tecnológica Nacional Regional Córdoba., 2019) Ledesma , Brenda Cecilia; Juárez , Juliana María; Mazario, Jaime; Domine, Marcelo; Beltramone, Andrea Raquel; Beltramone, Andrea Raquel; Juárez , Juliana MaríaLa transformación catalítica de 5-hidroximetilfurfural (HMF) para producir 2,5-dimetilfurano (DMF) se estudió sobre catalizadores bimetálicos (PtIr) y monometálicos (Pt) soportados en materiales mesoporosos CMK-3 y SBA-15. La temperatura y presión óptimas para la producción máxima de DMF fueron 120 ° y 15 atm. Los aumentos de temperatura y presión disminuyeron la selectividad a DMF. Los catalizadores se caracterizaron ampliamente por XRD, N2-isotermas, XPS, TPR, TEM y NH3-TPD. Los sitios activos de la aleación PtIr fueron muy activos y selectivos hacia la formación de la DMF deseada. El catalizador PtIr-CMK-3 mostró una excelente actividad y selectividad.