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In microbiology, in the context of a sterilization procedure, the D-value or decimal reduction time (or decimal reduction dose) is the time (or dose of an antimicrobial drug) required, at a given condition (e.g. temperature) or set of conditions, to achieve a one-log reduction, that is, to kill 90% of relevant microorganisms. [1]
30 maj 2018 · D-Value (Decimal Reduction Value) It is the time required at temperature T to reduce a specific microbial population by 90% or by a factor of 10. Z-Value is the number of degrees of temperature change necessary to change the D-Value by a Factor of 10. For example, if D-Value at 121ºC is 1.5 min & Z-Value is 10ºC.
In summary, D value and Z value are valuable statistical measures that provide insights into different aspects of data analysis. While D value focuses on detecting autocorrelation in time series data, Z value standardizes data and helps assess the significance of sample means or proportions.
D-value is the time required to kill 90% of the spores or vegetative cells of a given microorganism at a specific temperature in a specific medium. D-values can be determined from survivor curves when the log of population is plotted against time, or by the formula: D reference temperature = Time/ (Log a -Log b)
17 paź 2003 · The resistance value (death kinetics) of a BI was characterized in terms of decimal reduction time, D-value, which is the exposure time required, under specified set of conditions, to cause one log 10 or 90% reduction of the initial population (N 0, bioburden) of viable BI in the suspension [7, 8].
D-value (decimal reduction time) is the time required at a specific temperature to reduce the microbial population by 90%. It is a critical parameter for evaluating the effectiveness of sterilization processes.
A D-value can be thought of as a mass division diameter. It is the diameter which, when all particles in a sample are arranged in order of ascending mass, divides the sample's mass into specified percentages. The percentage mass below the diameter of interest is the number expressed after the "D".
