Kinetic study and surface response analysis on the rehydration of frozen-dried carrot (Daucus carota) [Estudio cinético y de superficie de respuesta para ia rehidratación de zanahorias (Daucus carota) liofilizadas]
Por:
Zambrano M.L., Rodríguez D.B., Álvarez A.
Publicada:
1 ene 2007
Resumen:
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°C, no significant differences (?=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 × 10-9 m2/s for 70 y 93°C. 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.
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