Pulsed Electric Fields (PEF) as pre-treatment for freeze-drying of plant tissues

[EN] 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.Al-Sayed, L.; Boy, V.; Madieta, E.; Mehinagic, E.; Lanoisellé, J. (2018). Pulsed Electric Fields (PEF) as pre-treatment for freeze-drying of plant tissues. En IDS 2018. 21st International Drying Symposium Proceedings. Editorial Universitat Politècnica de València. 1575-1582. https://doi.org/10.4995/IDS2018.2018.74841575158