Pulsed electric field processing

Question 1

PEF fact sheet

Answer 1

Non thermal
short bursts of electricity to inactivate microbes and ambient temp.
Breaks cell membranes by expanding existing pores and or creating new ones.
Minimal effect of nutritional and food quality increases shelf life.
Used on liquid and semi liquid items.
gram - easier thinner peptidoglycan layer.

Question 2

cell disintegration and pef

Answer 2

increased drying rate - pef pre-treatment - plant cell permeabilization increase rate of drying
Increasing juice yield.
Function ingredient/ bioactive extraction- anthcyanin and polyphenol extraction grapes.

Question 3

Drying PEF

Answer 3

Opens cell membranes increasing internal diffusion therefore greater control over drying.

Question 4

Advantages and disadvantages of PEF

Answer 4

ADV= not thermal - ambient temp
short time
minimally processed
DISADV= high capital cost
doesnt inactivate spores or enzymes
not suitable for all foods cant have air bubbles or low electricity conductivity.