High pressure processing Flashcards
What is the use of high pressure processing?
Preserves freshness and molecules by pasteurisation without heating
What does high pressure processing do to crustaceans?
Removes shells
What are the negatives of high pressure processing?
Irreversible damage to plant and animal tissue and spore-forming bacteria can survive
What is the typical high pressure process?
600MPa for 20 mins
What are pascals equal to?
N/m^2
What is the isostatic principle?
Food products are compressed by pressure then released to return to original shape
What happens if a food product contains moisture?
Pressure will not damage the product at macroscopic levels
What happens to gram negative bacteria in high pressure processing?
They leak out the product
What happens to gram positive bacteria in high pressure processing?
No leaking but still some damage
What happens to enzymes once pressure is released?
Either denature or return to original shape
What are the parameters for high pressure processing?
Pressure, time, temperature
Packaging material
Pressure uniformity
Reversible or irreversible compression
How much pressure must a package need to withstand for high pressure processing?
15%
What type of packaging is used for high pressure processing?
Plastic films and vacuum packing
What can high pressure processing inactivate?
Parasites
Microbes
Fungal spores
Viruses
Prions
Enzymes
