Abstract
Slabs of Chilean papaya hot air-dried at 60 °C were rehydrated at 20, 40, 60, and 80 °C to study the influence of process temperature on mass transfer kinetics during rehydration. Diffusive and empirical models were selected to simulate the experimental rehydration curves. All models parameters showed dependence with temperature, thus activation energy could be estimated according to an Arrhenius-type equation. Among the applied models, Weibull provided the best fit for each rehydration curve based on the statistical tests RMSE, SSE, and chi-square. According to these results, this model could be used to estimate the rehydration time of Chilean papaya. In addition, rehydration ratio and water-holding capacity were analyzed. Both indices showed a decrease with increasing rehydration temperature indicating modification of the papaya cell structure due to thermal treatment which resulted in a reduction of the rehydration ability, in particular at high rehydration temperatures.
Abbreviations
- a w :
-
Water activity (−)
- A :
-
Parameter of Eq. 3 (in minutes gram d.m. per gram water)
- B :
-
Parameter of Eq. 3 (in grams d.m. per gram water)
- C :
-
Parameter of Eq. 5 (in grams water per gram d.m)
- D :
-
Parameter of Eq. 5 (in minutes·gram water per gram d.m.)
- D eff :
-
Effective moisture diffusivity (in meters per second)
- α :
-
Shape parameter of Weibull model (−)
- β :
-
Scale parameter of Weibull model (min)
- λ :
-
Parameter of Eq. 5 (−)
- E a :
-
Activation energy (in kilojoules per mole)
- ϕ o :
-
Arrhenius factor (in square meters per second)
- L :
-
Thickness half (in meters)
- MR:
-
Moisture ratio (−)
- N :
-
Number of data
- R :
-
Universal gas constant (8.314 J mol−1 K−1)
- RR:
-
Rehydration ratio (in grams absorbed water per gram d.m.)
- WHC:
-
Water-holding capacity (in grams retained water per gram water)
- t :
-
Process time (in minutes)
- T :
-
Absolute temperature (in Kelvin)
- X wt :
-
Sample moisture content (in grams water per gram d.m.)
- X wo :
-
Initial sample moisture content (in grams water per gram d.m.)
- X d :
-
Sample moisture content after the drying process (in grams water per gram d.m.)
- X eq :
-
Equilibrium sample moisture content (in grams water per gram d.m.)
- X r :
-
Sample moisture content after rehydration (in grams water per gram d.m.)
- W r :
-
Sample weight after the rehydration process (in grams)
- W d :
-
Sample weight after the drying process (in grams)
- W l :
-
Weight of the drained liquid after centrifugation (in grams)
- z :
-
Number of constants
- exp:
-
Experimental
- cal:
-
Calculated
- ∞ :
-
Infinite
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Acknowledgments
The authors gratefully acknowledge financial support provided by the Research Department of the Universidad de La Serena (DIULS) for publication of this research. Mr. Roberto Lemus-Mondaca acknowledges the financial support given by the National Doctoral Fellowship of the Advanced Human Capital Program CONICYT.
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Zura, L., Uribe, E., Lemus-Mondaca, R. et al. Rehydration Capacity of Chilean Papaya (Vasconcellea pubescens): Effect of Process Temperature on Kinetic Parameters and Functional Properties. Food Bioprocess Technol 6, 844–850 (2013). https://doi.org/10.1007/s11947-011-0677-5
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DOI: https://doi.org/10.1007/s11947-011-0677-5