Resumen

ZAMBRANO, María L; RODRIGUEZ, Deborah B  y  ALVAREZ, Alfredo. Kinetic Study and Surface Response Analysis on the Rehydration of Frozen-dried Carrot (Daucus carota). Inf. tecnol. [online]. 2007, vol.18, n.4, pp. 47-56. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642007000400008.

In this work the effect of temperature on  the kinetics, the diffusion coefficient sand the addition of citric acid and sodium chloride on the rehydration of frozen-dried carrots (Daucus carota) have been studied. The model response surface was 4 factors with 3 central points. For 70 and 93 ºC, no significant differences (a=0.05) for the kinetic constant with mean of 0.42min^-1. Important differences were found between diffusion coefficients, from 6.1 to 3.18 x10^-9 m²/s for 70 y 93ºC. The variables with higher influence on rehydration were the content of citric acid, citric acid concentration and temperature, at the studied levels. The best condition for rehydration of carrot frozen-dried was obtained for 0.636 g/100ml acid concentration with 7 kg of water/kg dry solid, using the surface model. The mean value was 6.65 kg of water/kg dry solid.

Palabras llave : Daucus carota; rehydration; first order kinetic; model response surface.