In this work, the surface of a glassy carbon electrode (GCE) was modified with the polymer of 5-Amino-1-10 phenanthroline (5Aphen), Poly5Aphen, from a deep eutectic solvent (DES). The electrochemical response of the modified electrode (GCE/Poly5Aphen) was established regarding the oxidation of dopamine (DA) in the presence of ascorbic acid (AA) that is one of its major interferents. The results obtained by cyclic voltammetry (CV) showed that it is possible to polymerize 5Aphen on the surface of the GCE when using a DES. On the other hand, the results by CV and differential pulse voltammetry (DPV) showed that, unlike the bare GCE, when using the GCE/Poly5Aphen electrode it is possible to separate the electrochemical signal of the DA and AA as result of their simultaneous oxidation over the modified surface of the electrode.
El COVID-19 representa una crisis global, debido a que es una enfermedad emergente con un rápido aumento de casos y muertes desde su primera identificaciòn en Wuhan, China en diciembre de 2019. En medio de este brote se ha centrado la atenciòn en un grupo vulnerable de personas, las embarazadas. Se ha descrito que el virus SARS-coV-2 tiene predilecciòn por el receptor ECA2 presente a nivel placentario, condicionando una restricciòn al crecimiento intrauterino y/o parto pretérmino. Aunado a lo anterior se han planteado preocupaciones sobre si el virus del SARS-CoV-2 podría transmitirse de la madre positiva al COVID-19 al recién nacido a través de la leche materna. Es por ello, que en este trabajo se abordó una recopilación de resultados de estudios epidemiológicos sobre los efectos del COVID-19 durante el embarazo y lactancia materna.
In this work, the mechanism of nucleation and growth of gold was studied on the surface of a glassy carbon electrode (GCE) modified with poly-5-Amino-1-10 phenanthroline (Poly5Aphen), from Au (III) ions, dissolved in a deep eutectic solvent (DES). For which, electrochemical techniques such as cyclic voltammetry (VC) and chronoamperometry (CA) were used. The analysis of the results of the potentiostatic electrochemical tests showed that the Au nucleation and growth mechanism on the GCE/Poly5Aphen electrode fits a theoretical model of 3D nucleation limited by diffusion and by the reduction of residual water present in the electrode (1). In addition, the potentiostatic current density transients recorded during gold electrodeposition on the modified electrode (GCE/Poly5Aphen), when presented in their dimensionless form I2/ I2
m
vs t /tm
and compared with the theoretical models described by Scharifker and Hills (2), the experimental data did not fit the progressive or instantaneous nucleation models, presenting particularly large deviations for >1.4.
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