Publicaciones 2011-2020

@article{RN354,
title = {Synthesis of Bifunctional Receptor for Fluoride and Cadmium Based on Calix[4]Arene with Thiourea Moieties},
author = { C. Quiroga-Campano and H. Gomez-Machuca and S. Moris and P. Jara and J.R. De La Fuente and H. Pessoa-Mahana and C. Jullian and C. Saitz-Barria},
url = {/brokenurl#<Go to ISI>://WOS:000401593400017},
doi = {10.1016/j.molstruc.2017.03.089},
issn = {0022-2860},
year = {2017},
date = {2017-01-01},
journal = {Journal of Molecular Structure},
volume = {1141},
pages = {133-141},
publisher = {2017 Elsevier B.V.},
abstract = {A new calix[4]arene thiourea derivative bearing a benzothiazolyl moiety (L) was synthetized and characterized by single crystal X-ray, NMR and ESI-TOF. The binding ability of the bifunctional receptor towards several ions was investigated in acetonitrile by means of UV-Visible and NMR spectroscopy. The UV-Vis studies of receptor L demonstrated a stoichiometry of 1:1 for all ions studied. Also, recognize selectively F- and Cd2+ with a detection limit of 97 and 37 mu M, respectively., Also, H-1 NMR titration of receptor L indicated that both thiourea bridge and phenolic hydroxyl functional groups played a critical role in the binding of F- and Cd2+ ions. H-1 NMR spectrum showed that receptor L has a flattened-cone conformation in solution that changes to a cone conformation in the presence of fluoride while cadmium maintained the initial conformation.},
keywords = {bearing benzothiazole, cadmium, calix[4]arene, chemosensor, complexation, conformation, detection, fluorescent, fluoride, heterocycles, highly ions lower recognition, rim, selective thiourea},
pubstate = {published},
tppubtype = {article}
}

@article{RN232,
title = {Determination of Oxytetracycline from Salmon Muscle and Skin by Derivative Spectrophotometry},
author = { M.I. Toral and T. Sabay and S.L. Orellana and P. Richter},
url = {/brokenurl#<Go to ISI>://WOS:000356903400004},
doi = {10.5740/jaoacint.14-027},
issn = {1060-3271},
year = {2015},
date = {2015-01-01},
journal = {Journal of Aoac International},
volume = {98},
number = {3},
pages = {559-565},
abstract = {A method was developed for the identification and quantification of oxytetracycline residues present in salmon muscle and skin using UV-Vis derivative spectrophotometry. With this method, it was possible to reduce the number of steps in the procedure typically required for instrumental analysis of a sample. The spectral variables, order of the derivative, scale factor, smoothing factor, and analytical wavelength were optimized using standard solutions of oxytetracycline dissolved in 900 mg/L oxalic acid in methanol. The matrix effect was significant; therefore, quantification for oxytetracycline residues was carried out using drug-free salmon muscle and skin samples fortified with oxytetracycline. The LOD and LOQ were found to be 271 and 903 mu g/kg, respectively. The precision and accuracy of the method were validated using drug-free salmon muscle and skin tissues fortified at three different concentrations (8, 16, and 32 mg/kg) on 3 different days. The recoveries at all fortified concentrations were between 90 and 105%, and RSDs in all cases were less than 6.5%. This method can be used to screen out compliant samples and thereby reduce the number of suspect positive samples that will require further confirmatory analysis.},
keywords = {antibiotics, aquaculture, detection, fluorescence liquid-chromatography, performance residues, samples tetracycline},
pubstate = {published},
tppubtype = {article}
}

@article{RN129,
title = {Experimental and Theoretical Study on the Oxidation Mechanism of Dopamine in N-Octyl Pyridinium Based Ionic Liquids-Carbon Paste Modified Electrodes},
author = { C. Diaz and C. Garcia and P. Iturriaga-Vasquez and M.J. Aguirre and J.P. Muena and R. Contreras and R. Ormazabal-Toledo and M. Isaacs},
url = {/brokenurl#<Go to ISI>://WOS:000329531100111},
doi = {10.1016/j.electacta.2013.08.103},
issn = {0013-4686},
year = {2013},
date = {2013-01-01},
journal = {Electrochimica Acta},
volume = {111},
pages = {846-854},
publisher = {2013 Elsevier Ltd.},
abstract = {This work describes the influence of n-octyl pyridinium cations based ionicliquids-carbon paste modified electrodes on the oxidation mechanism of dopamine. Ionic liquids formed by hexafluorophosphate anion and n-octyl pyridinium [R-OPy](+); R= CH3, H, CF3, where ionic liquids containing CH3 and CF3 are new products, were synthesized and characterized. Modified carbon paste electrodes with these salts were characterized by electrochemicalimpedance spectroscopy and cyclic voltammetry. Electrochemical oxidation of dopamine was studied in PBS buffer solution at pH = 7.4. The influence of the ionic liquids in the oxidation of dopamine was studied by cyclic voltammetry and rotating disk electrode. The results show that typical carbon paste electrode presents an electrochemical/chemical mechanism; whereas [OPy]PF6 and [CF3-OPy]PF6 modified electrodes present an electrochemical/chemical/electrochemical mechanism. The experimental study is complemented with a theoretical analysis of substituent effects in terms of the molecular electrostatic potential, Mulliken population analysis and second order perturbation theory probed at the cation moiety of the IL These indices consistently show an electron density accumulation at the ipso position of the pyridinium moiety of the IL that is in agreement with the electrochemical characterization.},
keywords = {behavior, detection, disk dopamine electrochemical electrode, electrodes, impedance impedance, insights, ionic liquids-carbon mechanism, metabolites, oxidation paste rat rotating separation, spectroscopy, striatum},
pubstate = {published},
tppubtype = {article}
}