958 resultados para 2306 Química orgánica
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Mode of access: Internet.
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Mode of access: Internet.
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Contiene: T. 2.
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Mode of access: Internet.
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El t. III fue publicado en la Imp. del Diccionario Geográfico, a cargo de D. José de Rojas, y T.IV, Imprenta La Ilustración.
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Tesis de la Universidad Central (Madrid), Facultad de Farmacia, leída el 20-09-1866.
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Mode of access: Internet.
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Programa de doctorado de Oceanografía, Bienio 2003-2005. La fecha de publicación es la fecha de lectura
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[ES]Los polifenoles se caracterizan por su capacidad antioxidante. En este trabajo se ha desarrollado un método para determinar el perfil fenólico de extractos de diatomea de la especie Phaeodactylum tricornutum. Dicho método combina la preconcentración mediante SPE y HPLC para la identificación y cuantificación de los polifenoles. El estudio de extractos de ésta diatomea cultivada en agua de mar enriquecida con cobre evidencia una acumulación de compuestos fenólicos inducida por las altas concentraciones del metal. Si comparamos las concentraciones de polifenoles con las obtenidas para un blanco, éstas aumentan cuando aumenta la concentración de cobre.
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[EN] The study investigates the phenolic profile of exudates and extracts of several microalgae harvested in natural seawater in the presence and absence of Cu and Fe additions, at metal levels of environmental relevance. The experimental findings show changes in the concentrations and types of polyphenols as a function of the metal added and its spiked concentrations. The results shown might be useful to help explaining the dynamics of this important class of compounds in seawater and also encourage further studies aimed at using algae as a source of chemical principles to be used in the health, food and pharmaceutical industry.
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[EN]Policyclyc aromatic hydrocarbons (PAHs) are a potential risk for human health and marine biota in general that make necessary the monitorization of them. A miniaturized extraction system capable to extract PAHs from seawater was developed and optimized with the objective of implement it in an oceanographic buoy in the future. An analytical method was optimized by high performance liquid chromatography for the determination of extracted PAHs by the extraction system. The analytical method was validated and applicated to real samples of differents points of Gran Canaria. The method has enough sensitivity to detect and quantify concentrations below the concentrations established in the legislation. In some places where samples were taken some compounds exceed the legislation while other compounds follow it
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Tesis (Maestría en Ciencias, con Especialidad en Química Orgánica) UANL