Ciencia e Ingeniería en Alimentos y Biotecnología

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    Determinación del contenido de azúcares reductores, totales, almidón y de los elementos minerales calcio (Ca), hierro(Fe) y magnesio (Mg) en harinas de Amaranto variedad Alegría (Amaranthus caudatus L.), Chía (Salvia Hispanica L.), papa Puca-Shungo (Solanum tuberosum), y zanahoria blanca (Arracacha xanthorrhiza Bancroft)
    (Universidad Técnica de Ambato. Facultad de Ciencia e Ingeniería en Alimentos. Carrera de Ingeniería en Alimentos., 2018-07) Alcocer Villacís, Irene Raquel; Carpio, Cecilia Mercedes
    The objective of this study was to determine the content of reducing sugars, total sugars and starch in flours of Amaranth, Chía, potato Puca shungo and White carrot flours by the method of 3,5 dinitic salicylic acid (DNS). The results showed that carrot flour contains a high percentage of reducing sugars (3.68 percent) and total sugars (20.98 percent); while the potato Puca shungo flour showed that it has a higher percentage of starch (74.42 percent), followed by white carrot flour (69.16 percent). The mineral content was quantified by atomic absorption spectrophotometry. Calcium (Ca), iron (Fe) and magnesium (Mg) were analyzed in the 4 flours; showing chia flour the highest content of the three study minerals with values for Fe of 93.0 micrograms per gram, Ca 4861.2 micrograms per gram, Mg (4194.4 micrograms per gram), results similar to those documented in bibliography.
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    Determinación de la correlación entre métodos visuales ópticos y difusión en placa en el crecimiento de Escherischia coli
    (Universidad Técnica de Ambato. Facultad de Ciencia e Ingeniería en Alimentos. Carrera de Ingeniería Bioquímica, 2017-09) Fiallos Núñez, Johanna Elizabeth; Dugarte Jiménez, Nahir Yerely
    The correlation between optical methods: Spectrophotometer and turbidimeter, visual method: McFarland scale and the reference method of plate diffusion were evaluated in order to determinate the concentration of Escherichia coli at 9 hours. The visual method doesn´t have a correlation with the reference method because is a qualitative method and the measurements are subjective. In the case of the optical methods, the spectrophotometer had an error of 91,4 percent in comparison of the turbidimeter with an error of 2,2 percent. The turbidimeter was the only method which has a correlation with the reference method and can be used as an alternative for the traditional plate diffusion method.