Browsing by Author "Núñez Vergara, Luis"
Now showing items 41-60 of 106
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Squella Serrano, Juan; Sturm Schaub, Juan; Weiss López, Boris; Bontá, M.; Núñez Vergara, Luis (ELSEVIER SCIENCE, 1999-05-14)The electrochemical reduction of a series of beta-nitrostyrene and beta-methyl-beta-nitrostyrene derivatives: by tast and differential pulse polarography and cyclic voltammetry over a wide pH range was studied. The reduction ...
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Álvarez Lueje, Alejandro; Naranjo, Luis; Núñez Vergara, Luis; Squella Serrano, Juan (PERGAMON-ELSEVIER SCIENCE, 1998-01)The anodic and cathodic behavior of nisoldipine, 3-isobutyl-5-methyl-1,4-dihydro-2,6-dimethyl-4-(2-nitrophenyl)pyridine-3,5-dicarboxylate, are reported. This drug belongs to the nitroaryl-1,4-dihydropyridine family, known ...
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Squella Serrano, Juan; Núñez Vergara, Luis (1981)
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Squella Serrano, Juan; Bollo Dragnic, Soledad; Fuente Urrutia, Julio de la; Núñez Vergara, Luis (1994)The cyclic voltammetric behavior of nicardipine was studied. Particular attention was directed to the one-electron ArNO2/ArNO2•- couple as measured by the cyclic voltammetric mode in aqueous DMF mixed media. Analysis of ...
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Squella Serrano, Juan; Sturm, J. C.; Weiss López, Boris; Bontá, M.; Núñez Vergara, Luis (Elsevier Sequoia SA, 1999)The electrochemical reduction of a series of β-nitrostyrene and β-methyl-β-nitrostyrene derivatives by tast and differential pulse polarography and cyclic voltammetry over a wide pH range was studied. The reduction potentials ...
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De Souza, Antonio A.; De Moura, Maria Aline B.F.; De Abreu, Fabiane C.; Goulart, Marília O. F.; Da Silva, Eufrânio N.; Pinto, Antonio V.; Ferreira, Vitor F.; Moscoso Cabello, Raúl Andrés; Núñez Vergara, Luis; Squella Serrano, Juan (2010)The electrochemistry of 2,2-dimethyl-(3H)-3-(N-3'-nitrophenylamino) naphtho[1,2-b]furan-4,5-dione ([Q]-PhNO2), on mercury was investigated. The first peak is consistent with a quasi-reversible one-electron reduction of the ...
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Núñez Vergara, Luis; Salazar González, Ricardo Andrés; Navarrete Encina, Patricio; Camargo Grandón, Rodrigo; Yáñez Soto, Claudia; Squella Serrano, Juan (ELECTROCHEMICAL SOC, 2007)A study of the electrolytic oxidation of three new C-4 nitrofuryl 1,4-dihydropyridines in nonaqueous aprotic medium is presented. Controlled-potential electrolysis (CPE) in dimethylformamide +0.1 M tetrabutyl-ammonium ...
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Squella Serrano, Juan; Jimenez,; Bollo Dragnic, Soledad; Núñez Vergara, Luis (Elsevier Ltd, 1997)Electrochemical studies on 4-(nitrophenyl) substituted 1,4-dihydropyridines of pharmacological importance have allowed us to generate the one-electron reduction product, the nitro radical anion, ArNȮ- 2 , in aprotic media. ...
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Squella Serrano, Juan; Álvarez Lueje, Alejandro; Sturm,; Núñez Vergara, Luis (1993)A differential pulse polarographic method for the identification and quantitative determination of enoxacin is described. The method is based on the electrochemical reduction of the drug at the dropping mercury electrode. ...
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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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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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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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Cordano, G.; Pezoa Olivares, Jacqueline; Muñoz, S.; Rivera, E.; Medina, Jorge; Núñez Vergara, Luis; Pavani, Mario; Guerrero A., Aníbal; Ferreira Parker, Jorge (ELSEVIER SCIENCE BV, 2002-09)The effects of some imine and amine derivatives of vanillin on the respiration rate of mouse mammary adenocarcinoma TA3 line, its multiresistant variant TA3-MTX-R line and mouse hepatocytes, together with their respective ...
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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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Squella Serrano, Juan; Borges, Y.; Celedon, C.; Peredo, P.; Núñez Vergara, Luis (1991)A new differential pulse polarographic method is proposed for the determination of nicardipine, based on the electroactivity of the nitroaromatic group of the molecule. The proposed method is applied in the determination ...
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Squella Serrano, Juan; Barnafi, E.; Perna, S.; Núñez Vergara, Luis (1989)A method for the differential-pulse polarographic determination of nifedipine has been developed, based on the electrochemistry of the aromatic nitro group in the drug. Polarography has also been used in studies of the ...