Zoraida González Arias

University of Oviedo, Oviedo, Asturias, Spain

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Publications (5)16.03 Total impact

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    ABSTRACT: The interfacial and electrochemical behavior of 6-thioguanosine-6-thioguanine riboside (6TGR)-on a hanging mercury drop electrode was studied with ac and cyclic voltammetry in a solution of 0.1 M Na(2)SO(4) and 0.01 M sodium acetate buffer at pH 4.3. A self-assembled monolayer (SAM) of chemisorbed 6TGR molecules formed under determined adsorption conditions was characterized. A low-density monolayer of chemisorbed 6TGR molecules and a condensed monolayer of physisorbed ones, which are successively formed by reduction of the SAM, were also studied.
    Journal of Colloid and Interface Science 09/2006; 300(1):60-8. DOI:10.1016/j.jcis.2006.03.038 · 3.55 Impact Factor
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    ABSTRACT: The formation of self-assembled monolayers (SAMs) of 6-thioguanine and 6-thioguanosine on mercury from deaerated and air-saturated aqueous solutions has been studied. The self-assembly process was investigated using chronoamperometry, cyclic voltammetry and open circuit potential (ocp) measurements. The presence of dissolved oxygen is a necessary condition for the formation of full SAMs on a hanging mercury drop electrode (HMDE) at ocp. In the absence of oxygen, the formation of such SAMs requires application of an appropriate potential to the HMDE during a certain period of time. The effects of oxygen and applied potential are explained on the basis of the charge-transfer reaction involved in the self-assembly process.
    Journal of electroanalytical chemistry 02/2005; 575(2):243-248. DOI:10.1016/j.jelechem.2004.09.016 · 2.87 Impact Factor
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    ABSTRACT: A monolayer constituted by chemisorbed 6-thioguanine and physisorbed guanine molecules was formed on a hanging mercury drop electrode from deoxygenated solutions of 6-thioguanine (6TG) and guanine (G). The mixed monolayer was characterized by chronoamperometry, cyclic voltammetry, and phase-sensitive ac voltammetry under in situ conditions, and the experimental data revealed a compact packing of molecules in the film. Ex situ measurements in the presence of dissolved oxygen proved that the mixed monolayer is stable in solutions lacking 6TG and G.
    Journal of Colloid and Interface Science 09/2004; 276(1):132-7. DOI:10.1016/j.jcis.2004.03.073 · 3.55 Impact Factor
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    ABSTRACT: A self-assembled monolayer (SAM) of 6-thioguanine (6TG) was formed on the hanging mercury drop electrode, under open circuit potential, from 6TG solutions. The SAM has been characterized by cyclic voltammetry under both in situ and ex situ conditions and the experimental data reveal that the film is a densely packed structure of chemisorbed (mercury-thiol) molecules. The presence of this SAM has no influence on the rate of outer-sphere electrode reactions but strongly inhibits inner-sphere processes. The electrode reaction involving the Fe(CN) couple appears reversible in a hanging mercury drop electrode coated by the 6TG-SAM.
    Electroanalysis 03/2004; 16(12):1044 - 1050. DOI:10.1002/elan.200302912 · 2.50 Impact Factor
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    ABSTRACT: The adsorption behavior of 6-thioguanine (6TG) on a hanging mercury drop electrode has been studied with ac and cyclic voltammetry in 0.1 M Na2SO4 and 0.01 M sodium acetate solutions at pH 4.3. Several condensed phases of chemically adsorbed 6TG as well as one phase of physically adsorbed 6TG have been characterized. Under total coverage conditions, the films of chemiadsorbed molecules inhibit rather efficiently the electrode reaction of mercury oxide formation.
    Journal of Colloid and Interface Science 07/2002; 250(2):295-302. DOI:10.1006/jcis.2002.8339 · 3.55 Impact Factor
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    [Show abstract] [Hide abstract]
    ABSTRACT: The adsorption behavior of 6-thioguanine (6TG) on a hanging mercury drop electrode has been studied with ac and cyclic voltammetry in 0.1 M Na2SO4 and 0.01 M sodium acetate solutions at pH 4.3. Several condensed phases of chemically adsorbed 6TG as well as one phase of physically adsorbed 6TG have been characterized. Under total coverage conditions, the films of chemiadsorbed molecules inhibit rather efficiently the electrode reaction of mercury oxide formation.
    Journal of Colloid and Interface Science 07/2002; 250(2):295-302. DOI:10.1006/jcis.2002.8339 · 3.55 Impact Factor