Examinando por Materia "Electrodo serigrafiado"
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- PublicaciónAcceso abiertoDetección de los colorantes sintéticos amarillo crepúsculo y tartrazina en alimentos usando electrodos serigrafiados de carbono modificados con quitosano(Universidad de Ibagué., 2019) Barrero Ramirez, Juan David; Nagles, Edgar Orlando; Garcia, Olimpo JoseThe dyes are more useful in the food industry, they are important to improve the visible aspect of a product developed for consumption1, which in turn does not lose its color by contact with light and oxygen, among them can be classified into dyes of natural origin or manufactured synthetically, these properties have allowed synthetic dyes to occupy a first place in the food industry2 but the consumption of these in excess is responsible for health, causing side effects in the body of people This way must have a quantification of the dyes and perform the electrochemical techniques, these techniques are found in the physicochemical properties of AC and TZ such as; Resistance to light, pH and oxidation capacity in the presence of air, The objective of this work will be based on the development of an electrochemical sensor for AC and TZ to be displayed in food using a carbon-screened electrode modified with chitosan for its control in the handling of dyes in the food industry.
- PublicaciónAcceso abiertoDeterminación de imidacloprid en miel utilizando técnicas electroanalítica y cromatográfica(Universidad de Ibagué., 2019) Rivera Guzmán, Karla Estefanía; García Beltrán, Olimpo JoséThe simple modification of a screen printed single walled carbon nanotubes with ionic liquid 1-butyl-3-metilimidazolium tetrafluorborate allowed the development of a fast and selective methodology to determine imidacloprid (IMI). The morphological and conductive characteristics of the modified surface were analyzed with scanning electron microscopy and electrochemical impedance spectroscopy. The modified surface showed great activity towards the reduction of IMI to -1.2 V. The analytical variables were optimized using linear sweep voltammetry at 0.1 V for 60s, obtaining a limit of detection of 0.21 mg L-1 (0.82 µMol L -1). Relative standard deviation with six different electrodes was of 2.6% (n = 5). Finally, the potential interferers were studied and the sensor was applied in the determination of IMI using samples of commercial honey with recovery between 88.0 and 105.0 % for IMI.