Minimal Processing Flashcards
Why is it good
Fresh like
Minimal prep
Easy storage
Healthy eating
High pressure processing
150-700mpa applied
Kills vegetative micros but not spores
Viruses are also resistant
How? HPP
Pressurised bag is sealed and pressurised water is added to forma a hydrostatic pressure
Pressure is transmitted to food killing spoilage and Food poisoning micros
Types of food it is suitable for HPP
High water content foods
Advantages of HPP
Advantages of HPP
Non thermal pasteurisation
Maintains freshness
Less potential for lost processing contamination
Rapid uniform transmission of pressure
Disadvantages of HPP
Does not inactivate spores
Variable enzyme inactivation
Batch process
Thorough put is relatively low
Pulsed electric field
Food pumped between two electrodes
Pulsed high voltage field typically 15-40kV
Multiples pulses
Targeted cell membrane disruption
Applications of PEF
Extraction
Change texture
Change of functional properties
Microbial inactivation
Power ultrasound
Application of non audible sound waves
To reduce spore formation in milk
20 Food reduction of spores
UV Rays
Initially used for disinfection
Colour and turbidity effect use
Transparency is key for this
Flow rate depends exposure time - longer exposure more craziness of killing
Pulsed light
Multiple lamps emit a large quantity of energy
Lamps produce a wide spectrum of output aka broad continuous powerful
Non ionising
Limited lik UV to surface and transparent items
Cold plasma
4th state of mater found in stars
Factors effecting plasma
Power supply
Applied power
Gas supplied
Electrode arrangement
Potential applications of cold plasma
Surface decontamination
Air decontamination
Liquid treatment
Functional modification
