Browsing by Author "Molina, Patricia G."
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- CYTED Network: GEnoPsySEn - Development of genosensors for pharmacogenomic targets in the central nervous systemPublication . Santos, Marlene; Caldevilla, Renato; Grosso, Clara; Simal-Gandara, J.; Molina, Patricia G.; Pinto, Giovanny R.; Villa, Cristian C.; Serra, Gloria; Feria-Romero, Iris A.; Solano, Ovidio; Sanabria, Diana P. Dresseler; Souto, Pilar Villaverde; Comba, Fausto N.; Barroso, M. FátimaThe GenoPsySEN thematic network is a newly CYTED approved collaborative project between institutions and investigators from Argentina, Brazil, Colombia, El Salvador, Mexico, Spain, Paraguay, Portugal, and Uruguay, aimed at incorporating their expertise in various scientific disciplines into the successful development of genosensors for the detection of genetic variations affecting drug response in neuropsychiatric diseases. This project seeks to transfer scientific and technological results that can be applied to improve the Ibero-American Public Health Systems and contribute to reducing the number of patients without adequate treatment.
- Gold nanoparticles covalently assembled onto vesicle structures as possible biosensing platformPublication . Barroso, M. Fátima; Luna, M. Alejandra; Tabares, Juan S. Flores; Delerue-Matos, Cristina; Correa, N. Mariano ; Moyano, Fernando; Molina, Patricia G.In this contribution a strategy is shown to covalently immobilize gold nanoparticles (AuNPs) onto vesicle bilayers with the aim of using this nanomaterial as platform for the future design of immunosensors. A novel methodology for the self-assembly of AuNPs onto large unilamellar vesicle structures is described. The vesicles were formed with 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1-undecanethiol (SH). After, the AuNPs photochemically synthesized in pure glycerol were mixed and anchored onto SH–DOPC vesicles. The data provided by voltammetry, spectrometry and microscopy techniques indicated that the AuNPs were successfully covalently anchored onto the vesicle bilayer and decorated vesicles exhibit a spherical shape with a size of 190 ± 10 nm. The developed procedure is easy, rapid and reproducible to start designing a possible immunosensor by using envi-ronmentally friendly procedures.
- “Green Electrodes” Modified with Au Nanoparticles Synthesized in Glycerol, as Electrochemical Nitrite SensorPublication . Gobelli, Dino; Correa, N. Mariano; Barroso, M. Fátima; Moyano, Fernando; Molina, Patricia G.A new environmentally friendly Au nanoparticles (Au NPs) synthesis in glycerol by using ultraviolet irradiation and without extra-added stabilizers is described. The synthesis proposed in this work may impact on the non-polluting production of noble nanoparticles with simple chemicals normally found in standard laboratories. These Au NPs were used to modify a carbon paste electrode (CPE) without having to separate them from the reaction medium. This green electrode was used as an electrochemical sensor for the nitrite detection in water. At the optimum conditions the green sensor presented a linear response in the 2.0×10−7–1.5×10−5 M concentration range, a good detection sensitivity (0.268 A L mol−1), and a low detection limit of 2.0×10−7 M of nitrite. The proposed modified green CPE was used to determine nitrite in tap water samples.
- Study of lipid peroxidation and ascorbic acid protective role in large unilamellar vesicles from a new electrochemical performancePublication . Barroso, M. Fátima; Luna, M. Alejandra; Moyano, Fernando; Delerue-Matos, Cristina; Correa, N. Mariano; Molina, Patricia G.In this contribution an electrochemical study is described for the first time of lipid peroxidation and the role of antioxidant on lipid protection using large unilamellar vesicles (LUVs). In order to simulate the cell membrane, LUVs composed of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) were used. A vesicle-modified electrode was constructed by immobilizing DOPC LUVs onto carbon paste electrodes (CPEs). Lipid peroxidation was studied electrochemically by incubating the vesicle-modified electrodes with hydroxyl (HO) radicals generated via the Fenton reaction. Oxidative damage induced by HO was verified by using square wave voltammetry (SWV) and was indirectly measured by the increase of electrochemical peak current to [Fe(CN)6]4- which was used as the electrochemical label. Ascorbic acid (AA) was used as the antioxidant model in order to study its efficacy on free radical scavenging. The decrease of the electrochemical signal confirms the protective key role promoted by AA in the prevention of lipid peroxidation in vesicles. Through microscopy, it was possible to observe morphologic modification on vesicle structures after lipid peroxidation in the presence or absence of AA.