Pulsed electric field processing of functional drink based ...
Pulsed electric field(pef)
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Transcript of Pulsed electric field(pef)
Presentation on Pulsed Electric Field(PEF)
Presented by Anurag Tripathi 13/IFT/011Presented to Pushpendra Sir
PEF technologyHigh intensity (PEF) involves the application of
pulses of high voltage(typically 20-8-kV/cm) to food place between 2 electrodes
PEF treatment is continued at ambient sub-ambient or slightly above ambient temperature for less than 1s
Energy loss due to heating of foods is minimizedFor food quality attributes ,PEF technology is
considered superior to traditional heat treatment of foods
Avoids or greatly reduces the detrimental changes in sensory and physical properties of food
Square pulse generator using a pulse forming network3 CapacitorsInductorsSolid State
Switching devices
Processing effects
Electric Field – Increase in microbial inactivation with increase in intensity of electric field
Temperature- With constant electric field strength, inactivation increases with an increase in temperature (35–50°C )
Pressure. Pressure is applied to inhibit the formation of air bubbles.
Processing effects
Time of Exposure- Treatment time is defined as the product of the number pulses and the pulse duration. An increase in any of these variables increases microbial inactivation.
Pulse Wave Shape- may be applied in the form of exponential decaying, square-wave.
Pulsed electric field technology involves the application of microsecond high voltage pulses in the order of 10 to 60 kV. The high voltage pulses applied induce pores in cell membranes, causing a loss of barrier function, leakage of intracellular content and loss of vitality.
PEF technology in food preservation Improves shelf life of:BreadMilkFruit JuicesLiquid EggsApple juiceBrewers Yeasts
Efficiency over Heat Exchanger
Microbial Inactivation During the PEF process, lysis of
micro-organisms is caused by irreversible structural changes in the membranes, leading to pore formation and destruction of the semipermeable barrier of the membrane.
Electroporationcell exposed to high voltage electric field pulses temporarily destabilizes the lipid bi-layer and proteins of cell membranes. Plasma membrane become permeable and causes cell death
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