Examinando por Materia "Quitosano"
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- PublicaciónAcceso abiertoDesarrollo de nanofibras de PVA funcionalizadas con quitosano y obtenidas por lectrohilado para su potencial aplicación en el tratamiento de aguas con cobre(Universidad de San Buenaventura - Cali, 2016-05) Gómez Campo, Angelica; Osorno Valencia, Isabella; Franco Medina, EdgarThe wastewater treatment is a very important issue around the world, because if adequate water purification is performed, and reach the human being, could be harmful to health. Water contaminated with different substances or heavy metals, can cause illness and even death. Therefore, this scientific research sought to make membranes or nanometric mats by electrospinning process (electrospinning), with potential use as a filter for water containing copper. The mats are produced from solutions of polyvinyl alcohol (PVA) and Chitosan (CS) as a chelating agent to sequester metal ions, it also added a certain percentage of formaldehyde to prevent solubility in water of PVA. The nanofibers obtained were characterized by assays scanning electron microscopy (SEM), solubility, swelling, gravimetric efficiency, infrared spectroscopy Fourier transform (FTIR), differential scanning calorimetry (DSC) spectrometry.
- PublicaciónAcceso abiertoObtención de quitosano a partir de desechos del exoesqueleto de camarón tití (xiphopenaeus riveti) para el desarrollo de películas poliméricas plastificadas con glicerina(Universidad de San Buenaventura - Cali, 2014) López Calvache, Paola Fernanda; Cuervo Mulet, Raúl Alberto; Valencia Zapata, Mayra ElianaThis paper shows the process of preparation of polymer films based on chitosan and glycerol as plasticizer, chitosan extraction was performed from titi shrimp exoskeleton (Xiphoneus riveti) obtained in the gallery of the city of Buenaventura in the Department Valle del Cauca, following chemical processes, depigmentation, demineralization, deproteinization and deacetylation. Chitosan was characterized by infrared spectroscopy (FTIR), degree of deacetylation by potentiometric titration and solubility tests, etc. With chitosan films were obtained by the slow evaporation process with different concentrations of glycerin which were evaluated physical, mechanical, and antibacterial activity with Bacilius cereus bacteria and Escherichia coli. Dinámica de Investigación