| Autor: |
Ben Ammar, J., Lanoisellé, J.-L., Lebovka, N. I., Van Hecke, E., Vorobiev, E. |
| Předmět: |
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| Zdroj: |
Journal of Food Science (John Wiley & Sons, Inc.); Jan2011, Vol. 76 Issue 1, pE90-E97, 8p, 1 Black and White Photograph, 1 Diagram, 7 Graphs |
| Abstrakt: |
Efficiency of pulsed electric field (PEF) induced permeabilization at 293 K in selected fruit and vegetable plant tissues (apple, potato, carrot, courgette, orange, and banana) at electric field strength ( E) of 400 V·cm, 1000 V·cm and pulse duration ( t) of 1000 μs was studied experimentally. The mean cell radius (〈 r〉) was within 30 to 60 μm, and the ratio of electrical conductivities of the intact and damaged tissues (σ/σ) was within 0.07 to 0.79 for the studied tissues. Electroporation theory predicts higher damage for tissue with larger cells; however, the direct correlation between PEF damage efficiency and size of cell was not always observed. To explain this anomaly, a theoretical Monte Carlo model was developed and checked for parameters typical for potato tissue. The model showed a strong dependence of PEF damage efficiency and power consumption ( W) on σ/σ ratio. The optimum value of electric field strength ( E) was an increasing function of σ/σ, and plant tissues with high σ/σ ratio (σ/σ≈ 1) required application of a rather strong field (for example, E≈ 3000 V·cm for σ/σ≈ 0.8). However, the PEF treatment at a lower field ( E≈ 400 V·cm) allowed regulation of the selectivity of damage of cells in dependence of their size. A good qualitative correspondence between experimental data and simulation results were observed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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