Decimal reduction time (DRT)

Definition

Decimal reduction time (DRT) is the time required to reduce a microbial population by 90% at a specific temperature. It is a critical parameter in assessing the effectiveness of sterilization processes.

5 Must Know Facts For Your Next Test

1. DRT is also known as D-value.
2. A lower DRT indicates a faster reduction of the microbial population.
3. The DRT can vary significantly between different types of microorganisms.
4. Temperature plays a crucial role; higher temperatures generally result in shorter DRTs.
5. DRT is commonly used in food preservation and medical sterilization to ensure safety.

Review Questions

• What does decimal reduction time measure?
• How does temperature affect the decimal reduction time?
• Why is knowing the DRT important in microbial control?

Related terms

Sterilization: The process of eliminating all forms of microbial life, including spores.

Thermal Death Time (TDT): The time required to kill all microorganisms in a sample at a specific temperature.

Z-value: The temperature change needed to achieve a tenfold reduction in the D-value.