Browsing by Author "XX570789"
Now showing items 1-20 of 20
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Ureta Zañartu, María Soledad; Yáñez Soto, Claudia; Zagal Moya, José H. (SOCIEDAD CHILENA DE QUIMICA, 2001-03)The effect of ageing the electrode on the mass response was studied by two approaches, namely: i) ageing the Pt deposits on the Au/Q substrate and ii) ageing the Au/Q substrate and then examining the response of the Pt ...
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Chronocoulometry diffusion coefficients as a measure of cyclodextrin-estradiol complex association Yáñez Soto, Claudia; Basquinzay, R. (ELSEVIER SCIENCE SA, 2008-10-15)The formation of inclusion complexes between estradiol and p-cyclodextrin (CD), sulfobutyleter-beta-CD (SBCD) and hydroxypropil-beta-CD (HPCD) was studied by chronocoulometric and differential pulse voltammetry. In presence ...
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Yáñez Soto, Claudia; Araya, M.; Bollo Dragnic, Soledad (SPRINGER, 2010-10)For first time the complexation of bentazon (Btz) with native b-cyclodextrin (b-CD) and modified sulfobutylether- b-CD (SBE-CD) was studied by differential pulse voltammetry. In addition, a spectrophotometry UV–Visible study ...
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Jullian Matthaei, Carolina; Moyano, L.; Yáñez Soto, Claudia; Olea Azar, Claudio (PERGAMON-ELSEVIER SCIENCE LTD, 2007-05)The slightly water-soluble flavonoid quercetin (QUE) and its inclusion with either beta-cyclodextrin (beta CD), hydroxypropyl-beta-cyclodextrin (HP-beta CD) or sulfobutyl ether-beta-cyclodextrin (SBE-beta CD) were investigated. ...
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Bollo Dragnic, Soledad; Yáñez Soto, Claudia; Sturm Schaub, Juan; Núñez Vergara, Luis; Squella Serrano, Juan (AMER CHEMICAL SOC, 2003-04-15)Potassium ferricyanide ([Fe(CN)(6)](3-)) reduction and ferrocenemethanol (Fe-OH) oxidation at a beta-cyclodextrin (beta-CD)-modified gold electrode were investigated by cyclic voltammetry (CV) and scanning electrochemical ...
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Ureta Zañartu, María Soledad; Yáñez Soto, Claudia; Gutiérrez, C. (ELSEVIER SCIENCE SA, 2004-08-01)The system of I-octanol-beta-cyclodextrin in 0.5 M HClO4 at Pt electrodeposited on an Au/quartz crystal (Pt/Au/Q) has been studied by cyclic voltammetry (CV), the electrochemical quartz crystal microbalance (EQCM) and ...
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Yáñez Soto, Claudia; Núñez Vergara, Luis; Squella Serrano, Juan (WILEY-V C H VERLAG GMBH, 2002-04)Carbon paste electrodes modified with beta-cyclodextrin have been investigated for voltammetric determination of nitrendipine. The immobilization of the beta-cyclodextrin on the carbon paste leads to a modification of the ...
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Ureta Zañartu, María Soledad; Yáñez Soto, Claudia; Páez, Maritza; Reyes Cava, Gloria Ximena (ELSEVIER SCIENCE SA LAUSANNE, 1996-04-12)The activity of Pt, Pt + Pb and Pt + Ir deposits on Ti, for ethylene glycol (EG) oxidation, was studied in both 0.5 M H2SO4 and 0.5 M NaOH solutions. The metallic deposits were prepared by electrolysis at constant current ...
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Ureta Zañartu, María Soledad; Yáñez Soto, Claudia; Reyes Cava, Gloria Ximena; Gancedo, José Ramón; Marco, José F. (SPRINGER VERLAG, 1998-05)The activity of Pt-Ir deposits on titanium for the reduction of the nitrate ion in 0.5 M perchloric acid was studied. The electrodes were characterized by SEM-EDAX, XPS and cyclic voltammetry. The activity of the electrodes ...
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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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Yáñez Soto, Claudia; Gutiérrez, C.; Ureta Zañartu, María Soledad (ELSEVIER SCIENCE SA, 2003-01-16)The electrooxidation of primary alcohols with four to eight carbon atoms on black Pt electrodeposits on gold/quartz, and on commercial bright platinum/quartz electrodes in perchloric acid solution, was studied by cyclic ...
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Ureta Zañartu, María Soledad; Yáñez Soto, Claudia (PERGAMON-ELSEVIER SCIENCE LTD, 1997)The electro-reduction of nitrate ions in acid medium on Pt, Ir and on a 70:30 Pt, Ir alloy was studied by cyclic voltammetry. The alloy has a higher activity than the pure metals, which was interpreted as being due to ...
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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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Yáñez Soto, Claudia; Günther Sapunar, Germán (Sociedad Chilena de Química, 2014)Differences in association constants values of cyclodextrin inclusion complexes can be found in the literature. Most of the times, different experimental conditions have been used leading to different results. This paper ...
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Lanthanide sorbent based on magnetite nanoparticles functionalized with organophosphorus extractants Basualto Flores, Carlos; Gaete, José; Molina, Lorena; Valenzuela Lozano, Fernando; Yáñez Soto, Claudia; Marco, José F. (National Institute for Materials Science, 2015)In this work, an adsorbent was prepared based on the attachment of organophosphorus acid extractants, namely, D2EHPA, CYANEX 272, and CYANEX 301, to the surface of superparamagnetic magnetite (Fe3O4) nanoparticles. The ...
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Bracamonte, María V.; Yáñez Soto, Claudia; Bollo Dragnic, Soledad; Rivas, Gustavo A.; Ferreyra, Nancy F. (Elsevier, 2014)In this work, we characterize the electrochemical behavior of a new ferrocenyl-modified, hyperbranched poly(ethylenimine) (HBPei-Fc). The effects of the ionic strength, pH and the nature of the anion of the supporting ...
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Yáñez Soto, Claudia; Lápez Alarcón, Camilo Ignacio; Camargo Grandón, Rodrigo; Valenzuela, V.; Squella Serrano, Juan; Núñez Vergara, Luis (PERGAMON-ELSEVIER SCIENCE, 2004-05-01)A series of eight commercial C-4 substituted 1,4-dihydropyridines and other synthesized related compounds were tested for direct potential scavenger effect towards alkylperoxyl radicals and ABTS radical cation in aqueous ...
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Caballero, J.; Zamora Figueroa, Claudia Carolina; Aguayo, D.; Yáñez Soto, Claudia; González, F. D. (AMER CHEMICAL SOC, 2008-08-21)The interaction of progesterone with beta-cyclodextrin (beta-CD) was studied by differential pulse polarography. The aim of the present work was to study the effect of beta-CD on the electrochemical behavior of progesterone ...
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Voltammetric behavior of a 4-nitroimidazole derivative - Nitro radical anion formation and stability Yáñez Soto, Claudia; Pezoa Olivares, Jacqueline; Rodríguez, M.; Núñez Vergara, Luis; Squella Serrano, Juan (ELECTROCHEMICAL SOC INC, 2005)A new synthesized compound, 1-methyl-4-nitro-2-hydroxymethylimidazole (4-MNImOH), was electrochemically reduced at the mercury electrode in aqueous, mixed, and aprotic media. In an aqueous medium, only one voltammetric ...
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Yáñez Soto, Claudia; Bollo Dragnic, Soledad; Núñez Vergara, Luis; Squella Serrano, Juan (MARCEL DEKKER, 2001)PA-824 (2-nitro-6-(4-trifluoromethoxy-benzyloxy)-6,7-dihydro-5H-imidazo [2,1-b][1,3]oxazine) a nitroimidazopyran drug candidate for the treatment of tuberculosis was electrochemically studied with the aims of to propose a ...