Browsing by Author "Squella Serrano, Juan"
Now showing items 101-120 of 231
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Becerra Guzmán, Marcia Irene (Universidad de Chile, 2008)En la presente memoria se informa la caracterización electroquímica de 2 derivados nitroimidazolicos 1-alil-2-metil-4-nitroimidazol y 1-etil-2-metil-4- nitroimidazol utilizando técnicas electroquímicas como voltamperometría ...
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Turchán Labbé, Mariella Jéssica (Universidad de Chile, 2006)
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Basualdo Legüe, Julio Manuel (Universidad de Chile, 2006)La presente tesis contempla el estudio electroquímico y cromatográfico de la interacción de estrona con β-ciclodextrina (β-CD) y sulfobutileter-βciclodextrina (SBE-β-CD) en solución. El estudio se efectuó en un medio ...
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Zamora Figueroa, Claudia Carolina (Universidad de ChilePrograma Cybertesis, 2006)
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Sierra Rosales, Paulina; Berríos, Cristhian; Miranda Rojas, Sebastián; Squella Serrano, Juan (Elsevier Ltd, 2018)Sunset yellow, Allura red and Ponceau 4R are azo-colorants with similar chemical structures. These colorants were studied by electrochemical methods at a glassy carbon electrode in phosphate buffer solution (pH 7.0), ...
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Squella Serrano, Juan; Perna, S.; Núñez Vergara, Luis (1988)Nifedipine, a calcium antagonist drug, produces a well-defined polarographic wave due to the four-electron, four-proton reduction of the nitro group. This peak is diffusion-controlled and shows a linear dependence on the ...
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Núñez Vergara, Luis; Bollo Dragnic, Soledad; Atria Salas, Ana María; Carbajo, J.; Gunckel, S.; Squella Serrano, Juan (ELECTROCHEMICAL SOC INC, 2002-10)A comprehensive study of the electrochemical characteristics of 2-, 3-, and 4-nitroanisole isomers in three different electrolytic media has been carried out. Furthermore, kinetic characterization of the one-electron ...
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López Alarcón, Camilo; Squella Serrano, Juan; Núñez Vergara, Luis; Báez Guerrero, Hernán; Camargo Grandón, Rodrigo (JOHN WILEY, 2002)A gas chromatography/mass spectrometry (GC/MS) method for the qualitative and quantitative determination of the calcium-channel antagonists C-4-substituted 1,4-dihydropyridines, and their corresponding N-ethyl derivatives, ...
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Álvarez Lueje, Alejandro; Vásquez,; Núñez Vergara, Luis; Squella Serrano, Juan (Taylor and Francis Inc., 1998)An analytical chromatographic method for the determination of nimesulide in pharmaceutical forms has been developed. The method is based on high performance liquid chromatographic (HPLC) and electrochemical detection. ...
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Hydrogen-bonded supramolecular structures of three related 4-(5-nitro-2-furyl)-1,4-dihydropyridines Quesada, Antonio; Argüello da Silva, Jacqueline; Squella Serrano, Juan; Wardell, James L.; Low, John N.; Glidewell, Christopher (BLACKWELL, 2006-01)In ethyl 5-cyano-2,6-dimethyl-4-(5-nitro-2-furyl)-1,4-dihydropyridine-3-carboxylate, C15H15N3O5, the molecules are linked into chains by a single N-H (...) O hydrogen bond. The molecules in diethyl 2,6-dimethyl-4-(5-nitr ...
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Álvarez Lueje, Alejandro; Sturm Schaub, Juan; Squella Serrano, Juan; Núñez Vergara, Luis (PERGAMON-ELSEVIER SCIENCE, 2002-06-01)The development of a new HPLC-UV diode array procedure applied to follow the hydrolytic degradation of two well-known 4-nitrophenyl-1,4-dihydropyridine derivatives, nitrendipine and nisoldipine is reported. Hydrolysis of ...
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Álvarez Lueje, Alejandro; Sturm Schaub, Juan; Núñez Vergara, Luis; Squella Serrano, Juan (PERGAMON-ELSEVIER SCIENCE LTD, 2002-06-01)The development of a new HPLC-UV diode array procedure applied to follow the hydrolytic degradation of two well-known 4-nitrophenyl-1,4-dihydropyridine derivatives, nitrendipine and nisoldipine is reported. Hydrolysis of ...
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Núñez Vergara, Luis; García, F.; Domínguez, M. M.; Fuente Urrutia, Julio de la; Squella Serrano, Juan (1995)
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Squella Serrano, Juan; Núñez Vergara, Luis; Barría, J.; Echegaray, E. (1983)The interaction of glutathione with cloxacillin was investigated by a new a.c. polarographic procedure. The theoretical treatment used to describe the interaction is strongly consistent with the experimental results. The ...
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Inclusion complexes of estrone and estradiol with beta-cyclodextrin: Voltammetric and HPLC studies Yáñez Soto, Claudia; Basualdo Legüe, Julio Manuel; Jara Ulloa, Paola Andrea; Squella Serrano, Juan (WILEY, 2007-07)The interaction of estrone and estradiol with beta-cyclodextrins (beta CD) was investigated by differential pulse voltammetry (DPV) and high-performance liquid chromatography (HPLC) in mixed media. The co-solvent influence ...
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Squella Serrano, Juan; Núñez Vergara, Luis (1983)The interaction of glutathione with ampicillin was investigated by a new a.c. polarographic procedure. Ampicillin was found to interact strongly with glutathione. The stability constants were ascertained from the polarographic ...
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Núñez Vergara, Luis; Squella Serrano, Juan; Bollo Dragnic, Soledad; Marín Catalán, Rigoberto; Pino, L.; Díaz Araya, Guillermo; Letelier Muñoz, María Eugenia (PERGAMON-ELSEVIER SCIENCE LTD, 1998-01)1. Isradipine and lacidipine, two new drugs that are members of the nitro-aryl-1,4-dihydropyridine family, produced inhibition of both growth cultures and oxygen consumption on epimastigotes of Trypanosoma cruzi Tulahuen ...
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Squella Serrano, Juan; Lemus,; Núñez Vergara, Luis (1995)Electrochemical reduction of Ketanserin was studied at different pH and concentrations using polarography and cyclic voltammetry. Ketanserin exhibits two differential pulse polarographic peaks at the dropping mercury ...
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Núñez Vergara, Luis; Squella Serrano, Juan (1988)The interaction of glutathione with four β-lactam antibiotics was studied by an AC polarographic procedure. The interaction stability constant and the coordination number were calculated from the AC polarographic data. The ...
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Jara Ulloa, Paola Andrea; Núñez Vergara, Luis; Squella Serrano, Juan (Wiley-V CH Verlag GMBH, 2007-07)Tne reductive electrochemistry of 1-methyl-4-nitro-2-hydroxymethylimidazole, a 4-nitroimidazole derivative, was examined in the presence of surfactants anionic as sodium dodecyl sulfate (SDS), nonionic, Triton-X, Cationic, ...