Influence of Pulse Width on Polyphenol Extraction from Agricultural Products by Pulsed Electric Field

2013 ◽  
Vol 133 (2) ◽  
pp. 32-37 ◽  
Author(s):  
Akira Nakagawa ◽  
Hitoshi Hatayama ◽  
Koichi Takaki ◽  
Shoji Koide ◽  
Yukio Kawamura
Keyword(s):  
Electric Field ◽  
Pulse Width ◽  
Pulsed Electric Field ◽  
Agricultural Products ◽  
Polyphenol Extraction

Effect of Pulsed Electric Field on Freeze-Drying of Potato Tissue

2014 ◽  
Vol 10 (4) ◽  
pp. 857-862 ◽  
Author(s):  
Yali Wu ◽  
Dongguang Zhang
Keyword(s):  
Energy Consumption ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Pulse Width ◽  
Unit Area ◽  
Pulsed Electric Field ◽  
Pulse Number ◽  
Drying Rate ◽  
Drying Time

Abstract The influence of pulsed electric field (PEF) on the drying behavior of potato was investigated, and the optimal parameters were determined. Drying experiments were conducted with different PEF pre-treatments. The effects of process parameters of PEF pre-treatment were examined with respect to drying rate, drying time, productivity per unit area, and energy consumption. Results showed that the three parameters investigated were significant in the following sequence: pulse number, electric field strength, and pulse width. The optimal electric field strength, pulse width, and pulse number were 1,500 V cm−1, 120 μs, and 45 pulses, respectively. Under these optimal conditions, productivity per unit area increased by 32.28%, specific energy consumption decreased by 16.59%, drying time was shortened by 31.47%, and drying rate improved by 14.31% compared with the control group.

scholarly journals Effects of Pulsed Electric Field on the Cell Wall and Infection Activity of Rhizoctonia solani

Biology ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 73
Author(s):  
Feng ◽  
He ◽  
Pan ◽  
Xu ◽  
Xue ◽  
...  
Keyword(s):  
Cell Wall ◽  
Electric Field ◽  
Rhizoctonia Solani ◽  
Pulse Width ◽  
Processing Time ◽  
Pulsed Electric Field ◽  
Pulse Voltage ◽  
Control Group ◽  
Voltage Amplitude ◽  
Polygalacturonase Activity

This paper adopts the Design-Expert software to design an orthogonal experiment with a pulse voltage amplitude of 30 kV, processing time of three minutes, and a pulse width of 45 μs as the center points, in order to study the effects of the pulsed electric field on the cell wall and infection activity of Rhizoctonia solani. High-voltage pulse power was used to treat the bacteria solution with the pulsed electric field. Untreated Rhizoctonia solani were used as the control group. Transmission electron microscope images were used to analyze the cell wall damage. ANOVA was performed on the experimental results and the fitting degree of the model was good (F>>1). Response surface analysis was used to optimize the parameters based on chitin content and polygalacturonase activity. The optimal treatment conditions were obtained as a pulse voltage amplitude of 25 kV, processing time of 2.54 min, and a pulse width of 34.35 μs. On this basis, experiments were designed to verify the optimized conditions. The results demonstrated that, under the optimal processing conditions, the damage index of the cell wall of Rhizoctonia solani was 9.59% lower in chitin content and 83.05% lower in polygalacturonase activity compared with those of the control group. All indexes were significantly different (P < 0.001), which is consistent with the parameter optimization results. The results provide a theoretical basis for the pulsed electric field assisted sterilization and reference for the design of plant protection machinery in the latter stage.

Inactivation of Phytoplankton in Ship’s Ballast Water by Pulsed Electric Field and Thermal Treatment

2015 ◽  
Vol 1092-1093 ◽  
pp. 1060-1063
Author(s):  
Jun Feng Zhou ◽  
Ting Fei Xie ◽  
Le Ping Xu ◽  
Rui Zhao
Keyword(s):  
Thermal Treatment ◽  
Electric Field ◽  
Ballast Water ◽  
Pulse Width ◽  
Pulsed Electric Field ◽  
Aquatic Species ◽  
Electrode Gap ◽  
Preheating Temperature ◽  
Ship’S Ballast Water ◽  
Ship Ballast Water

Invasive aquatic species discharged through ship ballast water is one of the most serious problems posed nowadays in the marine environment. The effect of inactivation of phytoplankton by pulsed electric field and thermal treatment was studied. Effect factors such as pulsed voltage, electrode gap, pulse width and preheating temperature were explored, and its mechanism of inactivation was analyzed. The combined effect of mild thermal and PEF treatments was shown to give more effective damage of phytoplankton than application of PEF treatment alone. The untreated ballast water sample pretreated at moderate temperature (323 K) and moderate PEF (E ≈10kV/cm) showed a noticeable enhancing of inactivation.

Development of PEF extraction technology by Maguin

2015 ◽  
pp. 758-760
Author(s):  
Romain Delecourt ◽  
Loïc Marsal
Keyword(s):  
Sugar Beet ◽  
Electric Field ◽  
Pulsed Electric Field ◽  
Extraction Technology ◽  
Application System ◽  
Wide Range ◽  
Type Machine

Maguin (France) is still active in the application of pulsed electric field (PEF) technology. After having carried out successful tests on a 10 t/h pilot screw-type machine on sugar beet cossettes, a new application system based on a roller technology has been developed. This technology allows a wide range of application due to its flexibility with flowrates and materials. A variety of process schemes are proposed to ensure the best performance of the PEF technology.

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