Ciencia e Ingeniería en Alimentos y Biotecnología

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    Determinación de metales en cebolla de rama (Allium fistulosum L.), cultivada en suelos agrícolas cercanos al volcán Tungurahua
    (Universidad Técnica de Ambato. Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología. Carrera de Ingeniería en Alimentos, 2019-08) Tonato Bombón, Evelyn Gissela; Briceño Carrasquel, Jorge Alexander
    Tungurahua, a volcano located in the eastern mountain range of Ecuador, since its reactivation in 1999 has alternated phases of high volcanic activity, with gas and ash emissions, explosions and lava episodes, as well as phases of low activity. Its last eruptive phase occurred between February and March 2016. In this study it was proposed to evaluate the bioavailability of metals in agricultural soils of the Quero canton through the correlation between total content, their soluble fractions and these in branch onion (Allium fistulosum L.). All metals were determined by spectrometry atomic absorption of flame or graphite furnace using certified reference monoelementals aqueous standards with which the calibration curve for each metal was prepared daily. Was analyzed the edible section of the branch onion and the data were expressed on fresh basis. The results showed that the metal intake by the branch onion was independent of the bioavailable fraction of the metal in the soil for all metals studied. The national and international standards were taken as reference values. In the legislations consulted, no specific data were reported for branch onion, however, reference values were taken for similar aliments. The soil was strongly acidic with negligible salinity and little organic matter. In summary, the content of potassium, manganese, strontium, copper, cobalt, magnesium, nickel, lead, iron and zinc in the samples of branch onion studied were below the maximum values allowed in the consulted norms.
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    Determinación de metales en zanahoria (Daucus carota L.) cultivada en suelos agrícolas cercanos al volcán Tungurahua
    (Universidad Técnica de Ambato. Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología. Carrera de Ingeniería en Alimentos, 2019-09) Valencia Pérez, Patricio Geovanny; Briceño Carrasquel, Jorge Alexander
    In Ecuador, the recent activity of the Tungurahua volcano in 2016 caused the fall of ash and lava episodes, in which the sector where the highest ash concentrations were recorded was Quero. In this study, the content of metals in soils and carrots (Daucus carota L.) cultivated in agricultural areas near the Tungurahua volcano was considered. For the soil, the electrical conductivity and pH were determined at a ratio of 1: 2.5 p per v with distilled water and organic matter due to loss due to ignition. A fraction was made in royal water for total metals and a fraction in EDTA for available metals which were measured using an atomic absorption spectrophotometer of line, manganese, copper, iron, magnesium, potassium and zinc source with the flame atomizer, cobalt, nickel lead, cadmium and strontium in graphite furnace. Calibration curves were performed daily for each metal with monoelemental aqueous standards of certified reference. The soil was moderately acidic, with a negligible effect of salinity and very low organic matter content according to the standard of the Ministry of Environment of Ecuador and the content of all metals were within the values established by the same standard. In addition, the content of metals studied in carrots was found below the revised standards.