Heat Sterilization Flashcards
What symbolizes lethality rate?
F- Value
F- Value is considered to represent
Thermal death time
What is TDT?
Time required to achieve a specified reduction in microbial numbers at a given temperature
What is the purpose of calculating processing time?
Enables the operator to know how long a food in each can size should be held at a certain processing temperature.
What is another reason why calculating processing time is important?
To achieve the required thermal destruction at the slowest heating point in the container
UHT processing is also termed as?
Asceptic processing
UHT is?
The use of higher processing temperatures for a shorter time to sterilize products
What kind of products does UHT commonly sterilize?
Milk, yogurt, wine
How long of shelf life does UHT provide?
at least 6 months without refrigeration
what kind of process is UHT
Continuous flow sterilization
what do the temperatures range from in uht processing?
100-150 degrees celsius
what is the holding time of uht processing?
2-8 seconds
With aseptic processing and small liquid particles heat transfer is considered to be ___ because of___
worse; higher viscosity during liquid phase
Does liquid processing w/ small particles need longer time or shorter time?
longer times for temperature equalization
What kind of heat exchangers are suited for processing small particle liquids?
Tubular, scraped surface, double tube
