Correct Answer - Option 1 : Z-value
The Z-value of an organism is the temperature, in degrees Fahrenheit, that is required for the thermal destruction curve to move one log cycle.
D-value
Time in minutes required to reduce the number of survivors to 1/10th of the original at a specified temperature.
F-value
1. A number of minutes is required to kill a known population of microorganisms in a given food under specified conditions.
2. F value is usually set at 12D to give theoretical 12 log cycle reduction of the most heat-resistant species of mesophilic spores in a can of food.
T- value
The t-value measures the size of the difference relative to the variation in your sample data.
Difference between D-Value and Z-Value
| BASIS |
D Value |
Z Value |
| Definition |
It is the time required to reduce 90% of a specific bacterial population in a given medium at a given temperature. |
It is the temperature change that is required to achieve a tenfold reduction in the D-value. |
| Unit |
Minutes |
Celsius |
| Measurement |
Time taken |
Temperature change
|
