Thermal death time (TDT)

Definition

Thermal Death Time (TDT) is the shortest time required to kill all microorganisms in a liquid suspension at a specific temperature. It is a critical parameter in sterilization processes.

5 Must Know Facts For Your Next Test

1. TDT varies depending on the type of microorganism and the medium in which it is found.
2. Higher temperatures generally result in shorter TDTs.
3. TDT is an important factor in designing pasteurization and sterilization protocols.
4. Microorganisms with spores typically have longer TDTs compared to non-spore forming bacteria.
5. TDT can be influenced by environmental factors such as pH and moisture content.

Related terms

Decimal Reduction Time (D-value): The time required at a specific temperature to reduce the microbial population by one log cycle.

Thermal Death Point (TDP): The lowest temperature at which all microorganisms in a liquid suspension are killed in 10 minutes.

Pasteurization:

A process of heating food, usually liquids, to a specific temperature for a predefined length of time and then immediately cooling it to slow microbial growth.