Polytechnic University of Valencia Congress, 21st International Drying Symposium

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Pulsed Electric Fields (PEF) as pre-treatment for freeze-drying of plant tissues
Lubana Al-Sayed, Virginie Boy, Emmanuel Madieta, Emira Mehinagic, Jean-Louis Lanoisellé

Last modified: 26-12-2018


The influence of pulsed electric fields (PEF) treatment on freeze-drying for potato and strawberry tissues was investigated. Samples were pre-treated by PEF (  400 V cm-1) for different treatment times. Freeze-drying was carried out at -17°C and 18.4 Pa or 30 Pa for potato and strawberry tissues, respectively. The effects of PEF pre-treatment was compared with intact samples. The drying time was reduced by 35% for potato and 30% for strawberry. The sample rehydration capacity and the electrolytes released during the rehydration were higher for pre-treated samples. Strawberries texture was characterized by the hardness, the cohesiveness and the springiness.

Keywords: Pulsed Electric fields; Freeze-drying; Potato; Strawberry; Textural Properties.



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