phenol coefficient

phenol coefficient
phenol coefficient n a number relating the germicidal efficiency of a compound to phenol regarded as having an arbitrarily assigned value of 1 toward specified bacteria (as typhoid bacteria) under specified conditions

* * *

a measure of the bactericidal activity of a chemical compound in relation to phenol. The test is standardized (Rideal-Walker method, U.S. Department of Agriculture method). The coefficient is calculated by dividing the concentration of the test compound at which it kills the test organism in 10 minutes, but not in 5 minutes, by the concentration of phenol that kills the organism under the same conditions. It can be determined in the absence of organic matter or in the presence of a standard amount of added organic matter.

Medical dictionary. 2011.

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