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156 results on '"Prado-Gotor, R."'

9. Effect of Gold Nanoparticle Aggregation on the Kinetic Aspect of AuNPs/DNA Interactions

Author

Grueso Em, Spain Immunology, Prado Gotor R, and Giraldéz Pérez Rm

Subjects
Chemistry, Dna interaction, General Engineering, Biophysics, Nanoparticle, Kinetic energy
Abstract

Since successful therapy for curing cancer and others genetic diseases requires the transport of DNA into the cell by delivery vehicles, the understanding of the factors that control the complexation and condensation of the DNA is a key problem. During the last decade, researchers have developed some uses of nanoparticles-DNA systems, the majority of these studies dealing with NPs, which are covalently bound to the DNA. However, the kinetic aspect of AuNPs/DNA system by non-covalent interactions is less explored. Moreover, the role of high salt concentrations in these studies is of great interest due to the majority of nanoparticles have a great tendency to aggregate upon exposure to biological medium, significantly alter the uptake extent, rate, and mechanism of AuNPs/DNA interaction. As a contribution to this field, we have studied kinetics aspects of the binding of small tiopronin gold nanoparticles, AuNPs, to double stranded DNA in at high salt concentration by using the stopped-flow technique. The kinetic curves are biexponential and reveal the presence of two kinetic steps. Moreover, AFM studies reveal AuNPs aggregation in the presence of high salt content, while the same particle are well-dispersed in water. A two-step series mechanism reaction scheme was proposed. According to the reaction scheme, the formation of an intermediate complex formed by aggregated gold nanoparticles and DNA precedes the rate-determining step of the reaction.

Published
2021
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11. Salt and solvent effects on the kinetics of the oxidation of the excited state of the [(Ru(Bpy)(sub 3)](super 2+) complex by S(sub 2)O(sub 8)(super 2-)

Author

Lopes- Costa, T., Sanchez, F., Lopez-Cornejo, P., Villa, I., Perez-Tejeda, P., and Prado-Gotor R.

Subjects
Oxidation-reduction reaction -- Analysis, Ruthenium -- Chemical properties, Sulfur compounds -- Chemical properties, Excited state chemistry -- Research, Chemicals, plastics and rubber industries
Abstract

Salt and solvent effects on the kinetics of the oxidation of the excited state of the [Ru(bpy)(sub 3)](super 2+) complex by S(sub 2)O(sub 8)(super 2-) were studied in aqueous salt solutions (NaNO(sub 3) and water-cosolvent mixtures. It was possible to explain the normal salt effects and the abnormal solvent effects.

Published
2006

20. Design of highly stabilized nanocomposite inks based on biodegradable polymer-matrix and gold nanoparticles for Inkjet Printing

Author

Begines, B., Alcudia, A., Aguilera-Velazquez, R., Martínez, G., He, Y., Wildman, R., Sayagués, María Jesús, Jimenez-Ruiz, Aila, Prado-Gotor, R., Begines, B., Alcudia, A., Aguilera-Velazquez, R., Martínez, G., He, Y., Wildman, R., Sayagués, María Jesús, Jimenez-Ruiz, Aila, and Prado-Gotor, R.

Abstract

Nowadays there is a worldwide growing interest in the Inkjet Printing technology owing to its potentially high levels of geometrical complexity, personalization and resolution. There is also social concern about usage, disposal and accumulation of plastic materials. In this work, it is shown that sugar-based biodegradable polyurethane polymers exhibit outstanding properties as polymer-matrix for gold nanoparticles composites. These materials could reach exceptional stabilization levels, and demonstrated potential as novel robust inks for Inkjet based Printing. Furthermore, a physical comparison among different polymers is discussed based on stability and printability experiments to search for the best ink candidate. The University of Seville logo was printed by employing those inks, and the presence of gold was confirmed by ToF-SIMS. This approach has the potential to open new routes and applications for fabrication of enhanced biomedical nanometallic-sensors using stabilized AuNP.

Published
2019

23. Two-state model based on electron-transfer reactivity changes to quantify the noncovalent interaction between Co[(N[H.sub.3]).sub.5][Cl.sup.2+] and 18-crown-6- ether: the effect of second-sphere coordination on electron-transfer processes

Author

Borreguero, M. and Prado-Gotor, R.

Subjects
Electron transport -- Analysis, Ethers -- Chemical properties, Iron compounds -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The electron-transfer reaction between [[Fe[(CN).sub.6]].sup.4-] and [[CoCl[(N[H.sub.3]).sub.5]].sup.2+] is analyzed in the presence of 18-crown-6 ether (18C6) in different reaction media constituted by water and acetonitrile as organic cosolvent. The effect of the 18C6 in the intramolecular electron transfer in the binuclear complex [Fe[(CN).sub.5]pzCo[(N[H.sub.3]).sub.5] is examined.

Published
2008

24. Strength and character of peptide/anion interactions

Author

Chavanieu, A., Guichou, J.F., Prado-Gotor, R., Perez-Tejeda, P., Jimenez, R., Lopez-Cornejo, P., and Sanchez, F.

Subjects
Polymerization -- Analysis, Binding energy -- Research, Chemicals, plastics and rubber industries
Abstract

Study was conducted to investigate the influence of the polymerization degree on free energy of binding and on the anticooperativity of the anion/peptide union. The magnitude of the gain in negative free energy, as a consequence of the anticooperative character of the binding of the cobalt complex to the peptide, depends on the ratio of complex/monomers.

Published
2005

25. 'Abnormal' salt and solvent effects on anion/cation electron-transfer reactions: An interpretation based on Marcus-Hush treatment

Author

Garcia-Fernandez, E., Prado-Gotor, R., and Sanchez, F.

Subjects
Electron transport -- Research, Anions -- Research, Charge transfer -- Research, Chemicals, plastics and rubber industries
Abstract

T-jump measurements were used for examining the salt and solvent effects on the kinetics of the anion/cation electron-transfer reactions. Asymmetric behavior of anion/cation reactions that is dependent on the charge of the oxidant is observed.

Published
2005

32. Study of the Base-Catalyzed Nitrito–Nitro Isomerization Reaction ([(NH3)5Co-ONO]2+ → [(NH3)5Co-NO2]2+) in Mixed Solvents

Author

Jiménez, R., Villar, M., Cueto, Maite, Grueso, E., Illanes, J., Cobrian, J. I., Cantón, F., Villa, I., Sánchez, J. M., Maza, S., Muñoz, J. M., Muñoz, Concepción, Prado-Gotor, R., Jiménez, R., Villar, M., Cueto, Maite, Grueso, E., Illanes, J., Cobrian, J. I., Cantón, F., Villa, I., Sánchez, J. M., Maza, S., Muñoz, J. M., Muñoz, Concepción, and Prado-Gotor, R.

Abstract

5Co-NO2]2+ form is studied in various isodielectric water–cosolvent mixtures (methanol, ethanol, tert-butyl alcohol, and 2-propanol) at 298 K. In all cases, except for methanol–water mixtures, the rate constants increase with the proportion of cosolvent. Medium effects have been rationalized by using a multiparameter regression of solvent parameters which rationalizes the results obtained, including water–methanol mixtures. The experimental data, k2, in fact, are well correlated through the following equation: ln k2 = ln(k2)0 + aA + bB + cGexc where A, B, and Gexc are the acidity parameter, the basicity parameter, and the excess Gibbs free energy of the mixture, respectively. C 2004 Wiley Periodicals, Inc

Published
2004

41. Study of the base‐catalyzed nitrito–nitro isomerization reaction ([(NH3)5Co‐ONO]2+ → [(NH3)5Co‐NO2]2+) in mixed solvents

Author

Jiménez, R., primary, Villar, M., additional, Cueto, M., additional, Grueso, E., additional, Illanes, J., additional, Cobrian, J. I., additional, Cantón, F., additional, Villa, I., additional, Sánchez, J. M., additional, Maza, S., additional, Muñoz, J. M., additional, Muñoz, C., additional, and Prado‐Gotor, R., additional

Published
2004
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49. Electron Transfer Reactions in Micellar Systems

Author

Prado-Gotor, R., primary, Jiménez, R., additional, Pérez-Tejeda, P., additional, López-Cornejo, P., additional, López-López, M., additional, Sánchez, A., additional, Muriel-Delgado, F., additional, and Sánchez, F., additional

Published
2000
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