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

2018 ◽  
Author(s):  
Virginie Boy ◽  
Lubana Al-Sayed ◽  
Emmanuel Madieta ◽  
Emira Mehinagic ◽  
Jean-Louis Lanoisellé
Keyword(s):  
Electric Fields ◽  
Freeze Drying ◽  
Pulsed Electric Fields ◽  
Textural Properties ◽  
Plant Tissues ◽  
Drying Time ◽  
Pre Treatment

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.   

Pulsed electric fields pre-treatment of carrot purees to enhance their polyacetylene and sugar contents

2014 ◽  
Vol 23 ◽  
pp. 79-86 ◽  
Author(s):  
I. Aguiló-Aguayo ◽  
M.B. Hossain ◽  
N. Brunton ◽  
J. Lyng ◽  
J. Valverde ◽  
...  
Keyword(s):  
Electric Fields ◽  
Pulsed Electric Fields ◽  
Pre Treatment

Permeabilization of Plant Tissues by Monopolar Pulsed Electric Fields: Effect of Frequency

2010 ◽  
Vol 76 (1) ◽  
pp. E98-E111 ◽  
Author(s):  
Suvaluk Asavasanti ◽  
William Ristenpart ◽  
Pieter Stroeve ◽  
Diane M. Barrett
Keyword(s):  
Electric Fields ◽  
Pulsed Electric Fields ◽  
Plant Tissues

scholarly journals Potential of Pulsed Electric Fields for the preparation of Spanish dry-cured sausages

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Leire Astráin-Redín ◽  
Javier Raso ◽  
Guillermo Cebrián ◽  
Ignacio Álvarez
Keyword(s):  
Electric Fields ◽  
Meat Products ◽  
Pulsed Electric Fields ◽  
Water Transfer ◽  
Curing Process ◽  
Drying Process ◽  
Drying Time ◽  
Pilot Plant Scale ◽  
Drying Rates ◽  
Meat Samples

Abstract The aim of this investigation was to lay the groundwork of the potential application of Pulsed Electric Fields (PEF) technology for accelerating the drying process of meat and meat products, and specifically in this work of Spanish dry-cured sausages “longaniza”. PEF treatments were applied to pork loin samples, and the influence of different PEF parameters on the process were evaluated. An optimal PEF treatment of 1 kV/cm, 200 μs of pulse width and 28 kJ/kg was determined as the most suitable to electroporate meat cells and to improve water transfer by achieving a water content reduction of 60.4% in treated-meat samples dried at 4 °C. The influence of PEF on meat drying rate was also studied on minced pork and the results showed that with a particle size of 4.0 mm higher drying rates were achieved. To validate the results, Spanish cured sausages were prepared from treated and untreated minced pork and stuffed into gauzes and natural pork casings at pilot plant scale. After the curing process, the application of PEF to sausages stuffed into gauze reduced the drying time from 17 to 9–10 days, a reduction of 41–47%, confirming the effects described at lab scale and the potential of PEF for accelerating the sausage-drying process.

Enhanced electroporation in plant tissues via low frequency pulsed electric fields: Influence of cytoplasmic streaming

2012 ◽  
Vol 28 (2) ◽  
pp. 445-453 ◽  
Author(s):  
Suvaluk Asavasanti ◽  
Pieter Stroeve ◽  
Diane M. Barrett ◽  
Judith A. Jernstedt ◽  
William D. Ristenpart
Keyword(s):  
Electric Fields ◽  
Cytoplasmic Streaming ◽  
Low Frequency ◽  
Pulsed Electric Fields ◽  
Plant Tissues

scholarly journals The using Infrared Radiation on the Freeze-Drying of Cherry

2020 ◽  
Vol 9 (2) ◽  
pp. 1628-1630
Keyword(s):  
Energy Consumption ◽  
Infrared Radiation ◽  
Freeze Drying ◽  
Experimental Studies ◽  
Quality Characteristics ◽  
Drying Rate ◽  
Drying Time ◽  
Reduce Energy Consumption ◽  
Pre Treatment ◽  
Freeze Dryer

In this work experimentally investigated the drying rate of Cherry on the freeze-dryer (FD) and FD with infrared pretreatment (IR), and compared the quality characteristics of the cherry after rehydration. Results of experimental studies was determined that, the use of IR pre-treatment on the FD was much more effective. The use of IR waves showed that the drying time of cherries with IR pre-treatment is shorter than without pre-treatment. Especially, the application of IR pretreatment before freeze-drying, allows you to get quality products, and provides to reduce energy consumption by 15-17%.

scholarly journals Extraction of Antioxidant Compounds and Pigments from Spirulina (Arthrospira platensis) Assisted by Pulsed Electric Fields and the Binary Mixture of Organic Solvents and Water

2021 ◽  
Vol 11 (16) ◽  
pp. 7629
Author(s):  
Francisco J. Martí-Quijal ◽  
Francesc Ramon-Mascarell ◽  
Noelia Pallarés ◽  
Emilia Ferrer ◽  
Houda Berrada ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Binary Mixture ◽  
Electric Fields ◽  
Pulsed Electric Fields ◽  
Extraction Yield ◽  
Total Phenolic ◽  
Antioxidant Compounds ◽  
Total Phenolic Compounds ◽  
Extraction Technology ◽  
Pre Treatment

The application of pulsed electric fields (PEF) is an innovative extraction technology promoting cell membrane electroporation, thus allowing for an efficient recovery, from an energy point of view, of antioxidant compounds (chlorophylls, carotenoids, total phenolic compounds, etc.) from microalgae. Due to its selectivity and high extraction yield, the effects of PEF pre-treatment (3 kV/cm, 100 kJ/kg) combined with supplementary extraction at different times (5–180 min) and with different solvents (ethanol (EtOH)/H2O, 50:50, v/v; dimethyl sulfoxide (DMSO)/H2O, 50:50, v/v) were evaluated in order to obtain the optimal conditions for the extraction of different antioxidant compounds and pigments. In addition, the results obtained were compared with those of a conventional treatment (without PEF pre-treatment but with constant shaking). After carrying out the different experiments, the best extraction conditions to recover the different compounds were obtained after applying PEF pre-treatment combined with the binary mixture EtOH/H2O, 50:50, v/v, for 60–120 min. PEF extraction was more efficient throughout the study, especially at short extraction times (5–15 min). In this sense, recovery of 55–60%, 85–90%, and 60–70% was obtained for chlorophylls, carotenoids, and total phenolic compounds, respectively, compared to the maximum total extracted amount. These results show that PEF improves the extraction yield of antioxidant bioactive compounds from microalgae and is a promising technology due to its profitability and environmental sustainability.

Sludge pre-treatment with pulsed electric fields

2004 ◽  
Vol 49 (10) ◽  
pp. 123-129 ◽  
Author(s):  
O. Kopplow ◽  
M. Barjenbruch ◽  
V. Heinz
Keyword(s):  
Electric Fields ◽  
Anaerobic Degradation ◽  
Energy Input ◽  
Degradation Rate ◽  
Pulsed Electric Fields ◽  
Cell Content ◽  
Specific Energy Input ◽  
Sludge Treatment ◽  
Pre Treatment ◽  
Micro Organisms

The anaerobic stabilization process depends - among other things - on the bio-availability of organic carbon. Through pre-treatment of the sludge which leads to the destruction of micro-organisms and to the setting-free of cell content substances (disintegration), the carbon can be microbially converted better and faster. Moreover, effects on the digestion are likely. However, only little experience is available in sludge treatment with pulsed electric fields. Laboratory-scale digestion tests have been run to analyse the influence of pulsed electric fields on the properties of sludge, anaerobic degradation, sludge water reload and foaming of digesters. The results will be compared with those of other disintegration methods (high pressure homogeniser, thermal treatment). The effect of pre-treatment on the sludge is shown by the COD release. Degrees of disintegration have been achieved up to 20%. The specific energy input was high. The energy consumption has been decreased by initial improvements (pre-heating to 55¡C). The filament bacteria were partially destroyed. The foam reduction in the digesters was marginal. The anaerobic degradation performance has been improved in every case. The degradation rate of organic matter increased about 9%. Due to the increase of degradation, there is a higher reload of the sludge-water with COD and nitrogen compounds.

Sign in / Sign up

Export Citation Format

Share Document