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Arch. latinoam. nutr ; 57(2): 192-195, jun. 2007. ilus, tab, graf
Article in Spanish | LILACS | ID: lil-473605

ABSTRACT

Frambuesas (Rubus idaeus) se deshidrataron osmóticamente a través de un tratamiento convencional bajo el supuesto de solución homogénea, utilizando como medio una solución de glucosa al 62% a una temperatura de 50ºC. También se deshidrataron osmóticamente por medio de calentamiento óhmico, utilizando como medio una solución de glucosa al 57%, con voltaje variable (para mantener una temperatura entre 40-50ºC) y unaintensidad del campo eléctrico <100 V/cm. Al comparar los resultados se observa una evidente disminución en el tiempo de proceso al utilizar el calentamiento óhmico. En algunos casos, ésta reducción alcanzó hasta un 50%. Esto se explica por el efecto adicional al daño térmico que se genera en un proceso óhmico, denominado electroporación.


Acceleration of osmotic dehydration process through ohmic heating of foods: raspberries (Rubus idaeus). Raspberries (Rubus idaeus) were osmotically dehydrated by applying a conventional method under the supposition of a homogeneous solution, all in a 62% glucose solution at 50ºC. Raspberries (Rubus idaeus) were also osmotically dehydrated by using ohmic heating in a 57% glucose solution at a variable voltage (to maintain temperaturebetween 40 and 50ºC) and an electric field intensity <100 V/cm. When comparing the results from both experiments it was evident that processing time is reduced when ohmic heating technique wasused. In some cases this reduction reached even 50%. This is explained by the additional effect to the thermal damage that is generated in an ohmic process, denominated electroporation.


Subject(s)
Desiccation/methods , Fruit , Food Handling/methods , Hot Temperature , Rosaceae , Osmosis , Time Factors
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