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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Calidad y deterioro de platos "sous vide" preparados a base de carne y pescado almacenados en refrigeración

Díaz Molins, Pedro 30 April 2004 (has links)
En la presente Tesis Doctoral se estudió la capacidad de conservación y la calidad sensorial de diversos platos preparados a base de carne o pescado cocinados mediante la tecnología sous vide y conservados en refrigeración. El objetivo fue estudiar el deterioro y determinar la vida comercial con el fin de introducir mejoras tecnológicas. Se determinaron diversos parámetros microbiológicos (enterobacterias totales, aerobios y anaerobios psicrófilos, bacterias ácido lácticas y mohos y levaduras), físico-químicos (pH, aw, acidez, textura instrumental y color CIELab) y sensoriales (análisis descriptivo cuantitativo del aspecto, olor, olor, sabor y textura). Los resultados obtenidos indican que los tiempos y temperaturas recomendados para cocinar la carne y/o el pescado sous vide aseguraron una correcta pasteurización. No se detectaron cambios apreciables de humedad, acidez, color o textura. Sólo el análisis sensorial permitió evaluar el deterioro de la carne y/o pescado sous vide durante su almacenamiento. La tecnología sous vide proporcionó platos refrigerados a base de carne y/o pescado con una alta aceptación y una vida comercial adecuada para su distribución en sistemas de catering. / The present PhD thesis analyses the preserving capacity and the sensory quality of different meat-or-fish-based dishes which are cooked by using the sous vide method and recreating the conditions of catering industry.The aim was to study the spoilage and to determine the shelf-life of these products to introduce technological improvements. For this purpose, several parameters were established: microbiological (aerobic and anaerobic psychrotrophs, lactic acid bacteria, Enterobacteriaceae, mould and yeasts), physical-chemical (pH, aw, acidity, instrumental texture and colour CIELab) and sensory (QDA of the appearance, colour, odour, flavour and texture). The results indicated that the periods of time and temperatures which are recommended to cook sous vide meat or fish guaranteed a correct pasteurization which prevented the proliferation, at 2 ºC, of Enterobacteriaceae and altering microorganisms. Only the sensory analysis permitted the evaluation of the spoilage of the sous vide cooked meat or fish during their storage. All this would leave a considerable safety margin in the cooking process so that the sensory quality could be adjusted. Besides, no noticeable variations of humidity, acidity, colour or texture were detected by the physical-chemical techniques, which were employed.

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