Electrostimulated thermal permeabilisation of potato tissues

Lebovka, Nikolaï; Kupchik, Michael; Sereda, K. N.; Vorobiev, Eugène

doi:10.1016/j.biosystemseng.2007.10.002

Cited by 13 publications

(10 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface plots for the effects on TPC yield of temperature and time at a constant electric field of 15 V/cm (a), temperature and electric field at a constant time of 5 min (b) and electric field and time at a constant temperature of 60 C (c). membranes or eventually electroporation effects (Pereira et al, 2009), as reported in the results of other authors (Kulshrestha & Sastry, 2010;Lebovka et al, 2008;Lebovka et al, 2006). Electric treatments (i.e.…”

Section: Oh As An Alternative To Assisted Extractionmentioning

confidence: 85%

“…For instance, with conventional pre-treatment it was possible to get a saturation extraction yield -y ∞ -of 73% and 78% of the total anthocyanins and TPC, respectively, while with OH pre-treatment y ∞ values were of 84% and 92%. This extraction enhancement can be attributed to the reported effects on permeabilization of tissues (Asavasanti, Ristenpart, Stroeve, & Barrett, 2011;Lebovka et al, 2008;Pereira, Galindo, Vicente, & Dejmek, 2009). The fraction of extractable solutes during washing step -a e was dependent on the type of solute and pre-treatment applied, but did not follow any particular trend.…”

Section: Kinetic Modeling Of Aqueous Extractionmentioning

confidence: 96%

“…Heat generation is commonly faced as an issue in studies regarding electric effects, however technologically thermal effects may be advantageous (Allali, Marchal, & Vorobiev, 2008;Lebovka, Kupchik, Sereda, & Vorobiev, 2008) and the synergistic effects of temperature and electric field may bring new perspectives in the processing industry, as in the case of blanching or thermal stabilization of bio-materials.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of ohmic heating on extraction of food-grade phytochemicals from colored potato

Pereira

Rodrigues

Genisheva

et al. 2016

LWT

101

View full text Add to dashboard Cite

a b s t r a c tThe influence of ohmic heating (OH) through the application of moderate electric fields on phytochemical compounds recovery from colored potato (Solanum tuberosum L. var. Vitelotte) was studied. A BoxeBehnken design was used to simultaneously assess the effects of operational parameters such as electric field strength, temperature and process time on the yields of anthocyanins and total phenolic recovery on pretreatment of potato samples. From the analysis of the model, electric field, temperature and time were shown to have independent and interactive effects on the values of extraction yields. Aqueous extraction of phytochemical compounds after pretreatments can be described by using a twostep model involving simultaneous washing and diffusion of the solutes from the samples. Results shows that electrical fields of low energy levels and thermal effects can be combined and optimized into a single step treatment on extraction of anthocyanins and phenolic compounds from vegetable tissues providing high recovery yields with a reduced treatment time, less energy consumption and with no utilization of organic solvents (green extraction).

show abstract

Section: Oh As An Alternative To Assisted Extractionmentioning

confidence: 85%

Section: Kinetic Modeling Of Aqueous Extractionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of ohmic heating on extraction of food-grade phytochemicals from colored potato

Pereira

Rodrigues

Genisheva

et al. 2016

LWT

101

View full text Add to dashboard Cite

show abstract

“…6 Depending on the PEF parameters, reversible electro-permeabilization can provide a potential to induce stress responses, such as stress-induced metabolite production. 7,8 When PEF treatments are given in conditions compatible with irreversible cell damage, it affects the viscoelastic properties of plant tissues. It was demonstrated that PEF treatments may decrease the stiffness of potato tissue to levels similar to those achieved by hyper-osmotic treatment.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pulsed Electric Field on the Viscoelastic Properties of Potato Tissue

2009

View full text Add to dashboard Cite

We have investigated whether transient permeabilization would give rise to transient or permanent changes in the potato tissue texture. The changes on the viscoelastic properties of potato tissue exposed to PEF during small-amplitude oscillatory dynamic rheological measurements were monitored. The elastic (G') and viscous moduli (G") were measured every 30 s after the delivery of the pulse and the loss tangent (tan-δ) change calculated. Our results, supported by similar measurements on osmotically dehydrated control samples, clearly show that PEF causes a rapid change of the viscoelastic properties of the tissue that could be attributed to a partial loss in turgor pressure. This would be an expected consequence of electroporation. The recovery of tan-δ to values similar to those before pulsation, strongly suggests recovery of cell membrane properties and turgor. Materials and Methods SamplesPotato tubers (Solanum tuberosum L. cv. Bintje) grown in the south of Sweden, were manually washed and peeled. A rectangular cross-section sample, 15 mm long and 6.0 mm wide, was obtained from the phloem parenchyma tissue using a pair of parallel sharp blades. PEF treatment• Samples were treated at nominal field strength range of 30 to 500 V/cm, with single rectangular pulses of 1 ms, 10 µs and 100 µs, delivered axially to the tissue;• Osmotically pre-treated samples were subjected to a single 1 ms pulse in the range of 30 to 500 V/cm. Additionally, a sequence of 9 rectangular pulses of 500 V/cm of 1 ms each was also tested;• The pulsation for each PEF treatment was given 150 to 200 s after the start of the small-amplitude oscillatory dynamic rheological measurements;• Five measurements were done for each condition. Small-amplitude oscillatory dynamic rheological measurementsThe potato sample was placed on the lower plate of the rheometer. The upper plate was brought into contact with the sample until a normal force of 1 N was reached. Measurements of the tan-d were recorded in the oscillatory mode as a function of time at intervals of 30 s The oscillation stress amplitude was 0.1 % and the frequency 1 Hz. Stress sweeps were applied to verify that data were acquired within the linear viscoelastic regime. • Sample impedance was measured prior to pulsing and 30 s to 2 min after pulsing by using a low voltage sinusoidal wave form (V s ) at 5 V and 1 kHz, by turning on switch A; Experimental setup• The resistance of the tissue samples during the pulsing period was done by turning on switch B, to deliver the high pulse voltage (V t ) from pulse generator;• After PEF, response voltage (V f ) was monitored and recorded through the reference resistor (R f ) by using a digital oscilloscope. The impedance (I) of the tissue was calculated through Equation 1[1];• Electrical resistance of the tissue during pulsing period was calculated through Equation 1 by using V t instead V f . Results Tan-δ measurement during PEF treatment• Tan-δ change was calculated by subtracting the tan-δ values measured at time intervals of 30 s after pul...

show abstract

“…Note that potato is a popular model material commonly used for the PEF treatment experiments (Angersbach et al 1997;Lebovka et al 2005aLebovka et al ,b, 2006Lebovka et al , 2007Lebovka et al , 2008Praporscic et al 2006;Galindo et al 2008a,b;Pereira et al 2009). …”

Section: Introductionmentioning

confidence: 98%