Carrera Ingeniería en Alimentos

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Author: search.filters.author.Burgos Mayorga, José Eduardo

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    Estudio de la influencia de Pasteurización al vacío sobre las propiedades nutricionales, sensoriales y microbiológicas de néctar de naranja (Citrus x sinensis) y zanahoria (Daucus carota L.)
    (Universidad Técnica de Ambato. Facultad de Ciencia e Ingeniería en Alimentos. Carrera de Ingeniería en Alimentos., 2016-10) Burgos Mayorga, José Eduardo; Angós Iturgaiz, Ignacio Ángel
    The present study had like purpose evaluate the influence of the vacuum pasteurization over the physicochemical, microbiological and sensory properties of nectar elaborated with orange juice (Citrus x sinensis) and carrot juice (Daucus carota L.). For the execution of this work it has been taken in check two factors: time and cooking temperature based in two levels of thermal lethality. The lethality values were established based in two thermal resistant microorganism presents in the nectar: Zygosaccharomyces bailii and Neosartorya fischeri. It was proposed six treatments, for each microorganism they were applied three combinations time-temperature of lethality equivalent to assure a 5 logarithmic unit reduction. The physicochemical properties (pH, total acidity, total soluble solids, colour and 5-hidroximetilfurfural), nutritional (vitamin C), sensory (hedonic and descriptive parameters) and the food safety (Staphylococcus aureus, Listeria monocytogenes, Escherichia coli, total coliforms, total aerobes, moulds and yeasts) were evaluated in raw, pasteurized sample and over the storage. The nectar that presented the better nutritional, sensory and microbiological properties was the submitted to vacuum pasteurization at 88 Celsius degree for 32,68 minutes. Such treatment retained the 85,87 percent of the initial content of vitamin C, reached a life stock of 12 days in refrigeration at 6 Celsius degree in relation to the microbial content of total aerobes. The unitary production cost of the nectar submitted was 0,81 USD for a bottle of 260 ml, elaborated in pilot plant conditions.