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PULSED ELECTRIC FIELD: A SUSTAINABLE APPROACH FOR NON-THERMAL
FOOD PROCESSING
Narziyev M.S.
Candidate of technical science,
Ismatova Sh.N.
Docent,PhD, docent,
Yuldasheva Sh.J
Senior teacher, Bukhara engineering-technological institute,
Ismatova N.N.
Postgraduate student,
Bukhara Engineering and Technology Institute,
Bukhara city Uzbekistan,
E-mail:
Abstract:
This paper explores the potential of Pulsed Electric Field (PEF) technology as a
sustainable, non-thermal method for food processing. PEF applies short, high-voltage electric
pulses to liquid and solid food products to achieve microbial inactivation, enhance mass transfer,
and preserve nutritional and sensory qualities. The study highlights the working principles of
PEF, its integration into industrial systems, and its effectiveness in improving oil extraction and
minimizing energy consumption. PEF is shown to be a promising technology for meeting the
growing consumer demand for minimally processed, high-quality foods.
Keywords:
Pulsed electric field (PEF),non-thermal processing, microbial inactivation,
electroporation, food quality, oil extraction, energy efficiency, food preservation, food
processing innovation.
Introduction.
In recent years, the demand for innovative, non-thermal food processing
technologies has significantly increased, aiming to overcome the limitations of conventional
thermal methods. Among these emerging technologies, Pulsed Electric Field (PEF) processing
stands out due to its ability to enhance product safety and quality without the adverse effects of
heat. PEF processing involves applying short bursts of high-voltage electric fields—typically
ranging from 20 to 80 kV/sm—to liquid foods placed between two electrodes for durations
ranging from microseconds to milliseconds. For solid foods, due to the larger treatment chamber
and power limitations of the pulse generator, lower field strengths of 1 to 8 kV/cm are generally
used. These electric field pulses can be applied as exponentially decaying, square, bipolar, or
oscillatory waveforms, often at high repetition rates—up to 3000 pulses per second—to ensure
uniform treatment of the entire food volume. PEF technology serves as a novel method for
pasteurization, utilizing high-intensity electric fields to inactivate microorganisms or to alter the
structural integrity of food materials. This non-thermal approach preserves the color, flavor,
nutritional value, and texture of food products far better than traditional heat-based treatments.
Consequently, PEF has gained significant interest in food engineering as a promising, energy-
efficient solution for producing safe, high-quality, and functionally enhanced food products. In
the context of oilseed processing, particularly flaxseeds, PEF treatment improves the
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permeability of cell membranes, thereby enhancing oil extraction efficiency during pressing or
subsequent processing stages.
Pulsed Electric Field (PEF) processing involves the application of a series of short, high-voltage
electric pulses. These pulses disrupt the cell membranes of vegetative microorganisms by
creating pores or enlarging existing ones—a phenomenon known as electroporation. As a result,
intracellular contents leak out, leading to the loss of vital metabolic activity such as growth and
division, ultimately causing microbial inactivation. The effectiveness of microbial inactivation
using PEF largely depends on both processing parameters and equipment design, including:
Electric field strength,Treatment duration, Pulse frequency, Pulse width, Processing temperature.
Additionally, several product-related parameters influence the efficacy of microbial inactivation:
pH level (acidity), Presence of antimicrobial or ionic compounds, Electrical conductivity, Mean
ionic strength
The electric pulses used in PEF treatment may take various waveforms, including exponentially
decaying, square, and bipolar forms, depending on the desired effect (Figure 1).
As shown in Figure 2, increasing the electric field strength from 1 to 8 kV/cm significantly
improves the oil yield, which supports the application of PEF as a pre-treatment for oilseed
pressing.
Working Principle of Pulsed Electric Fields.
The core principle of Pulsed Electric Field (PEF)
technology is the application of short, high-intensity electric pulses—typically ranging from 10
to 80 kV/sm and lasting from microseconds to milliseconds—to a food product placed between
two electrodes. The treatment is usually performed at room temperature or slightly above or
below it. The total treatment time is defined by the number of pulses and their effective duration.
Due to the presence of charged ions in food products, they exhibit a certain level of electrical
conductivity. When the electric field is applied, the current flows through the liquid food and
distributes uniformly via the charged molecules. This results in electroporation of microbial cell
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membranes, leading to permanent damage and microbial inactivation.
PEF is classified among non-thermal food processing technologies, which aim to preserve the
nutritional value, such as vitamins, minerals, and natural flavors, while consuming less energy
compared to conventional thermal processes.
Additionally, PEF is used in biotechnology and genetic engineering for applications such as cell
fusion and electroporation. The process involves placing the food product between a set of
electrodes, where the distance between them defines the treatment gap. Pulses may be delivered
in various forms, including exponentially decaying, square wave, bipolar, or oscillatory shapes,
depending on the desired outcome. After treatment, the food is aseptically packaged and stored
under refrigeration. PEF systems can be easily integrated into existing food production lines. For
solid food products and cell disruption applications, a typical PEF processing setup includes a
pulse generator and a treatment chamber unit.In applications related to liquid food pasteurization,
the PEF system generally consists of a raw material reservoir, a liquid pump, a pulse generator, a
treatment chamber, a packaging unit, and optionally, heating/cooling modules and a final product
storage space.
These processing lines can be sanitized using Clean-In-Place (CIP) or Steam-In-Place (SIP)
systems, ensuring compliance with hygiene and food safety regulations.
Figure 3. A diagram illustrating the various components of the pulsed electric field (PEF)
processing system
Discussion of results
. Pulsed Electric Field (PEF) technology is based on the
application of high-voltage electric pulses to food products placed between a set of electrodes
that define the treatment gap within the PEF chamber. The core system consists of a high-voltage
pulse generator, a compatible liquid handling system, and a treatment chamber equipped with
necessary monitoring and control devices .The food product is introduced into the treatment
chamber either statically or in a continuous flow. Inside the chamber, the two electrodes are
separated by an insulating material to prevent electrical short circuits. When high-voltage pulses
are generated, they are applied to the electrodes, which then deliver the electric field directly to
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the product positioned between them.As a result, the food is exposed to an intense electric field,
responsible for inducing irreversible electroporation in microbial cell membranes. This
disruption leads to microbial inactivation while preserving the quality and functionality of the
food.
Figure 4. Block diagram of a pulsed electric field food processing system with main components
Conclusion.
Pulsed Electric Field (PEF) technology, as an emerging non-thermal
food processing method, has gained significant attention for its ability to preserve the nutritional
and sensory qualities of food while reducing energy consumption. Despite the promising nature
of this method, its application remains limited due to the relatively small number of
comprehensive studies and industrial implementations compared to conventional thermal
treatments. This research has demonstrated that the use of PEF technology in processing
agricultural raw materials—such as oilseeds—can substantially enhance process efficiency. The
application of high-voltage electric pulses facilitates the permeabilization of cell membranes,
improving mass transfer processes like oil extraction, microbial inactivation, or dehydration. As
consumer preferences continue to shift toward minimally processed foods with fresh-like
characteristics, the food industry requires technologies that can meet these expectations without
compromising food safety or quality. PEF offers a practical solution for processors to achieve
this goal. It allows for the treatment of liquid foods and the pre-treatment of solid foods before
pressing, drying, or other unit operations. In summary, PEF technology presents a forward-
looking, energy-efficient alternative to traditional methods. Its integration into industrial food
processing lines has the potential to advance product quality, sustainability, and consumer
satisfaction in line with current market trends.
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