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Browsing Química by Subject "Absorción"
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Item Determinación de la Biodisponibilidad in vitro de hierro en diferentes matrices alimentarias elaboradas a partir de harinas fortificadas comerciales(Universidad Santiago de Cali, 2019) Guzmán Aristizabal, Luisa María; Usuriaga Moreno, María Camila; Ramírez Navas, Juan Sebastián (Director); Rojas Renjifo, Katherine (Directora)Iron (Fe) deficiency has been recognized with the World Health Organization as a public health problem, in countries such as Colombia. It affects a large part of the inhabitants, especially children and women in gestation. In order to counteract the consequences generated by this population, the lack of this mineral establishes the need to use Iron Fortification. The aim of this work was to evaluate the effect of temperature on the iron diazability of three homemade preparations, in which commercial flours fortified with iron were used. The percentage dialysotity of Iron (Fe) was taken as an indicator of the bioavailability of said ore. The determination was made using the in vitro method, which includes an enzymatic digestion that simulates the physiological process under controlled pH conditions and subsequent quantification by atomic absorption spectroscopy. For each of the samples an estimated percentage between 4 and 5% was obtained which are according to the literature in that they do not exceed 10% absorption of non-hemine iron from food.Item Obtención de nanoarcillas mediante intercalación de las capas de arcilla bentonítica con el aminoacido l-lisina.(Universidad Santiago de Cali, 2025) Arboleda Valencia, Lina María; Ríos Acevedo, Jhon Jairo (Director)In the present study, organoclays were obtained from modified bentonite or montmorillonite (MMT) through a lysine intercalation process. Initially, the clay was cleaned and purified by stirring and hydrochloric acid to eliminate any organic components that could interfere with the intercalation process. Subsequently, lysine was intercalated into the clay structure. The material was characterized by Fourier transform infrared spectrophotometry (FTIR), thermogravimetric analysis (TGA), laser diffraction (LD), and scanning electron microscopy (SEM). Additionally, a physicochemical characterization was performed using standardized methodologies taken from the internal methods manual of a non-metallic industrial minerals producer. The results obtained confirmed the intercalation of lysine into montmorillonite (MMT), which demonstrated a significant increase in the swelling capacity of the lysine-MMT product compared to unintercalated MMT.