Browsing by Author "Squella Serrano, Juan"
Now showing items 41-60 of 177
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Contreras, G.; Barrientos, C; Moscoso, R.; Álvarez Lueje, Alejandro; Squella Serrano, Juan (Elsevier, 2020)In this work, we have both synthesized and studied 4-phenylbutyl-3,5-dinitrobenzoate (3,5-DNBPh) as a potential precursor of an electrocatalytic mediator for the oxidation of NADH, with the di-nitro compound immobilized ...
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Moscoso Cabello, Raúl Andrés; Barrientos, C.; Moris, S.; Squella Serrano, Juan (Elsevier B.V., 2019)In a previous study, we revealed a new way to modify multi-walled carbon nanotubes (MWCNTs) with 3,5-dinitrobenzoic acid (35DNB). Furthermore, we proved that a 35DNB-MWCNTGC electrode efficiently catalysed the oxidation ...
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Electrochemical and EPR characterization of 1,4-dihydropyridines. Reactivity towards alkyl radicals Núñez Vergara, Luis; López Alarcón, Camilo; Navarrete Encina, Patricio; Atria Salas, Ana María; Camargo Grandón, Rodrigo; Squella Serrano, Juan (TAYLOR & FRANCIS LTD, 2003)This work reports the electrochemical oxidation of a series of three synthesized 4-substituted-1,4-dihydropyridine derivatives in different electrolytic media. Also, an EPR characterization of intermediates and the reactivity ...
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Núñez Vergara, Luis; Santander Gutiérrez, Ingrid Paola; Navarrete Encina, Patricio; Valenzuela Pedevila, Jorge; Sturm Schaub, Juan; Squella Serrano, Juan (ELECTROCHEMICAL SOC, 2006)The present paper deals with the electrochemical and electron spin resonance (ESR) characterization of a number of nitroso phenyl 1,4-dihydropyridines in aprotic media on a hanging drop mercury electrode (HDME). The ...
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Núñez Vergara, Luis; Bollo Dragnic, Soledad; Fuentealba Arcos, Jorge Patricio; Sturm Schaub, Juan; Squella Serrano, Juan (KLUWER ACADEMIC/PLENUM PUBL, 2002-04)Purpose. To characterize the electrochemical behavior of the photodegradation product of nifedipine, i.e., 2,6-dimethyl-4-(2-nitrosophenyl)-3,5-pyridine-carboxylic acid dimethyl ester (NPD) in different electrolytic media. ...
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Quintana Espinoza, P.; Yáñez, C.; Escobar, C.; Sicker, D.; Araya Maturana, Ramiro; Squella Serrano, Juan (2006)Three 2′-hydroxy chalcone derivatives were electrochemically reduced to the radical anion by a reversible one-electron transfer followed by a chemical dimerization reaction. Under suitable conditions of the medium, the ...
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Sierra Rosales, Paulina; Torres, Rodrigo; Sepulveda, Carlos; Kogan Bocian, Marcelo; Squella Serrano, Juan (Wiley, 2018)Gold nanoparticles (AuNPs) have unique properties, making them attractive for electronic and energy-conversion devices and as (electro)catalysts for electrochemical sensors. In addition to the size and shape of AuNPs, the ...
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Núñez Vergara, Luis; Bontá, M.; Sturm, J. C.; Navarrete Encina, Patricio; Bollo Dragnic, Soledad; Squella Serrano, Juan (PERGAMON-ELSEVIER SCIENCE, 2001-08-31)This paper reports a comprehensive study by tast polarography, d.p.p., and cyclic voltammetry on the electrochemical reduction in different electrolytic media of ortho- and meta-nitrotoluene derivatives. Controlled potential ...
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Bollo Dragnic, Soledad; Muñoz, L.; Núñez Vergara, Luis; Squella Serrano, Juan (WILEY-V C H VERLAG GMBH, 2000-03)Tacrine, 9-amino-1,2,3,4-tetrahydroacridine, an antialzheimer's disease agent was electrochemically studied and a polarographic method For its quantitative determination in pharmaceuticals was developed. Tacrine was ...
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Bollo Dragnic, Soledad; Muñoz,; Núñez Vergara, Luis; Squella Serrano, Juan (2000)Tacrine, 9-amino-1,2,3,4-tetrahydroacridine, an antialzheimer's disease agent was electrochemically studied and a polarographic method for its quantitative determination in pharmaceuticals was developed. Tacrine was ...
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Sierra Rosales, Paulina; Toledo Neira, Carla; Squella Serrano, Juan (Elsevier B.V., 2017)© 2016 Elsevier B.V.Food colorants are chemicals added to foods and soft drinks during manufacturing or processing. However, some of these chemicals represent potential risks to human health, especially if they are consumed ...
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Núñez Vergara, Luis; Squella Serrano, Juan (1983)The a.c polarographic method has been applied in the study of the glutathione-ampicillin interaction at pH 7.4 and 37°C. Ampicillin shifted the peak potentials of glutathione to less negative values. A linear relation was ...
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Núñez Vergara, Luis; Farías Oddone, Daniel Rodrigo; Bollo Dragnic, Soledad; Squella Serrano, Juan (ELSEVIER SCIENCE, 2001-01)This paper reports the feasibility of free radicals formation from flutamide by using cyclic voltammetry. The electrochemical characteristics and the reactivity of the one-electron reduction product from flutamide in mixed ...
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Squella Serrano, Juan; González, P.; Bollo Dragnic, Soledad; Núñez Vergara, Luis (KLUWER ACADEMIC/PLENUM PUBL, 1999-01)
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Núñez Vergara, Luis; Ortiz, Luis J.; Bollo Dragnic, Soledad; Squella Serrano, Juan (1997)This paper reports a comprehensive study by cyclic voltammetry on the electrochemical characteristics and the reactivity of the one-electron reduction product from a series of nitro aryl 1,4-dihydropyridines in mixed and ...
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Salazar González, Ricardo Andrés; Navarrete Encina, Patricio; Camargo Grandón, Rodrigo; Squella Serrano, Juan; Núñez Vergara, Luis (ELSEVIER SCIENCE SA, 2008-10-01)This work reports the electrochemical oxidation of two new synthetic C4-vanillin and -isovanillin-1,4-dihydropyridines in aprotic medium. Its reactivity with alkylperoxyl radicals ABAP-derived at pH 7.4 is also studied. ...
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Álvarez Lueje, Alejandro; Pessoa Mahana, Hernán; Núñez Vergara, Luis; Squella Serrano, Juan (ELSEVIER SCIENCE, 1998-08)The electrochemical reduction of four 2,5-dimethoxy nitrobenzene 6-substituted derivatives in aqueous and mixed media by cyclic voltammetry, tast and differential pulse polarography were studied. In aqueous media, pH > 8, ...
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Squella Serrano, Juan; Campero, A.; Maraver, J.; Carbajo, J. (PERGAMON-ELSEVIER SCIENCE, 2006-10-25)The electrochemical reduction of 2-nitroimidazole in a non-aqueous medium using cyclic voltammetry (CV) at a mercury electrode was carried out. The 2-nitroimidazole derivative in DMF + 0.1 M tetra(n-butyl)ammonium ...
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Núñez Vergara, Luis; Santander, Paola; Navarrete Encina, Patricio; Squella Serrano, Juan (ELSEVIER, 2005-06-15)A comprehensive study of the electrochemical reduction in protic media of parent C-4 nitrophenyl 1,4-DHPs and their corresponding nitrosophenyl 1,4-DHPs was carried out. The reduction potentials of synthesized aromatic ...
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Núñez Vergara, Luis; Bontá, M.; Sturm Schaub, Juan; Navarrete Encina, Patricio; Bollo Dragnic, Soledad; Squella Serrano, Juan (ELSEVIER SCIENCE, 2001-06-15)A comprehensive study of the electrochemical reduction, in different electrolytic media, of two nitroso compounds, i.e. ortho- and meta-nitrosotoluene derivatives has been carried out. Furthermore, UV-vis and EPR spectroscopic ...