Thermal processing of food Flashcards
What are the objectives of pasteruisation?
inactivate vegetative pathogens and extend shelf life
What are the main aims of domestic cooking?
- Improve flavour and digestibility
- Kill pathogenic microbes
What is apertization?
Canning
What is the purpose of apertization?
Inactivate spores
How does apertization work?
Increasing the pressure of the container allows water to boil at a much higher temperature
What is the decimal reduction time?
The time needed to reduce viable numbers by a log unit at a specified temperature
What is the Z value?
The Z value is the temperature change needed to bring about a log change in the D value
Why do bacteria produce spores?
To help get the cell through difficult conditions
What are the factors affecting heat resistance?
- Stage of growth the cells are in
- Composition of heating medium
What is meant by commercial sterility?
Absence of organisms able to grow in product
