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| In ], '''D-value''' refers to '''decimal reduction time''' (or decimal reduction dose) and is the time (or dose) required at a given condition (e.g. temperature), or set of conditions, to kill |
In ], '''D-value''' refers to '''decimal reduction time''' (or decimal reduction dose) and is the time (or dose) required at a given condition (e.g. temperature), or set of conditions, to kill 100% (or 1 log) of the exposed ]. The term originated from assessing microbial thermal resistance and ] analysis; however, it has analogous uses in other microbial resistance and death rate applications, such as (but not limited to) those of ] and ] processing. | ||
| Thus after a colony is reduced by 1 D, only 10% of the original organisms remain, i.e., the population number has been reduced by one decimal place in the counting scheme. Generally, each lot of a ]-resistant organism is given a unique D-value. When referring to D-values, for the purpose of thermal analysis, it is proper to give the temperature as a subscript of the "D". For example, given a hypothetical organism which is reduced by 90% after exposure to temperatures of 150° ] for 20 minutes, the D-value would be written as D<sub>150C</sub> = 20 minutes. If generally describing D-value for any temperature, a common abbreviation is D<sub>T</sub> (where T is temperature) until a value for T is relevant to express, specifically. Another more general abbreviated expression of D-value is D<sub>10</sub> (as to denote 10% reduction). | Thus after a colony is reduced by 1 D, only 10% of the original organisms remain, i.e., the population number has been reduced by one decimal place in the counting scheme. Generally, each lot of a ]-resistant organism is given a unique D-value. When referring to D-values, for the purpose of thermal analysis, it is proper to give the temperature as a subscript of the "D". For example, given a hypothetical organism which is reduced by 90% after exposure to temperatures of 150° ] for 20 minutes, the D-value would be written as D<sub>150C</sub> = 20 minutes. If generally describing D-value for any temperature, a common abbreviation is D<sub>T</sub> (where T is temperature) until a value for T is relevant to express, specifically. Another more general abbreviated expression of D-value is D<sub>10</sub> (as to denote 10% reduction). | ||
Revision as of 18:37, 28 September 2018
In microbiology, D-value refers to decimal reduction time (or decimal reduction dose) and is the time (or dose) required at a given condition (e.g. temperature), or set of conditions, to kill 100% (or 1 log) of the exposed microorganisms. The term originated from assessing microbial thermal resistance and thermal death time analysis; however, it has analogous uses in other microbial resistance and death rate applications, such as (but not limited to) those of ethylene oxide and radiation processing.
Thus after a colony is reduced by 1 D, only 10% of the original organisms remain, i.e., the population number has been reduced by one decimal place in the counting scheme. Generally, each lot of a sterilization-resistant organism is given a unique D-value. When referring to D-values, for the purpose of thermal analysis, it is proper to give the temperature as a subscript of the "D". For example, given a hypothetical organism which is reduced by 90% after exposure to temperatures of 150° C for 20 minutes, the D-value would be written as D150C = 20 minutes. If generally describing D-value for any temperature, a common abbreviation is DT (where T is temperature) until a value for T is relevant to express, specifically. Another more general abbreviated expression of D-value is D10 (as to denote 10% reduction).
D-value determination is sometimes carried out to measure a disinfectant's efficiency to reduce the number of microbes present in a given environment.
See also
References
- Priscila Gava Mazzola, Thereza Christina Vessoni Penna, Alzira M da S Martins (17 October 2003). "Determination of decimal reduction time (D value) of chemical agents used in hospitals for disinfection purposes". BMC Infectious Diseases. 3: 24. doi:10.1186/1471-2334-3-24.
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