Abstract
The osmotic dehydration (OD) is a treatment that reduces partially the moisture content and the water activity of a food. The use of reduced pressure in the first minutes of an OD is called pulsed vacuum osmotic dehydration (PVOD). In PVOD, the expulsion of occlude gases and the entrance of the solution in the food matrix are induced, with consequently mass transfer improvement. In the present work, the influences of independent variables (temperature (T), pressure of vacuum pulse (PV), sodium chloride concentration [NaCl] and sucrose concentration [suc]) on water loss (WL), solid gain (SG), weight reduction (WR), water activity (aw) and moisture content (U) of tomato slices were studied. The optimum condition obtained had its kinetics tested with three models from the literature. The optimized condition (T 40 °C, PV 56.25 mbar, [NaCl] 7.5 % and [suc] 32.5 %) resulted in the maximum values of WL, and WR (42.2, and 36.1 %, respectively) and minimum SG, aw and U (4.0, 0.948 and 76.5 kg water/100 kg sample, respectively). With respect to the kinetics, the best agreement was obtained with the model that considers variable diffusivity.
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Abbreviations
- OD:
-
Osmotic dehydration
- PVOD:
-
Pulsed vacuum osmotic dehydration
- T:
-
Temperature (°C)
- PV:
-
Pressure of vacuum pulse (mbar)
- [NaCl]:
-
Sodium chloride concentration (%)
- [suc]:
-
Sucrose concentration (%)
- WL:
-
Water loss (kg water/100 kg sample)
- WR:
-
Weight reduction (kg/100 kg sample)
- SG:
-
Solid gain (kg solid/100 kg sample)
- aw :
-
Water activity
- U:
-
Moisture content (kg water/100 kg sample)
- w:
-
Weight (kg)
- xw :
-
Water content (%)
- xST :
-
Solid content (%)
- X1 :
-
Independent variable (T)
- X2 :
-
Independent variable (PV)
- X3 :
-
Independent variable ([NaCl])
- X4 :
-
Independent variable ([suc])
- z:
-
Specific directional coordinate (m)
- t:
-
Time (s)
- m:
-
Amount of water or solids (kg)
- Deff :
-
Effective diffusion coefficient (m2 s−1)
- L:
-
Half thickness of sample (m)
- i:
-
Number of series terms
- W:
-
Dimensionless water or solid content
- zss :
-
Mass fraction of soluble solids in the sample (kg/100 kg sample)
- yss :
-
Mass fraction of soluble solids in the osmotic solution (kg/100 kg osmotic solution)
- Y:
-
Drive force
- k1 :
-
Adjusted Peleg’s parameter
- k2 :
-
Adjusted Peleg’s parameter
- X:
-
Water loss or solid gain (kg/100 kg sample)
- t1/2 :
-
Half-life of dehydration/impregnation rate (min)
- SE:
-
Standard error
- 0:
-
Initial condition
- f:
-
Final condition
- eq:
-
Equilibrium condition
- w:
-
Water
- s:
-
Solid
- HDM:
-
Hydrodynamic mechanism
- ∞:
-
At infinite time
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Acknowledgments
The authors would like to thank the economical support CNPq (National Council for Scientific and Technological Development), FAPEMIG (State of Minas Gerais Research Foundation) and CAPES (Coordination for the Improvement of Higher Education Personnel).
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Corrêa, J.L.G., Dantas Viana, A., de Mendonça, K.S., Justus, A. (2016). Optimization of Pulsed Vacuum Osmotic Dehydration of Sliced Tomato. In: Delgado, J., Barbosa de Lima, A. (eds) Drying and Energy Technologies. Advanced Structured Materials, vol 63. Springer, Cham. https://doi.org/10.1007/978-3-319-19767-8_11
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