السلام عليكم ورحمة الله : تحية طيبة
Phenol coefficient
(1)Test requirements. Phenol coefficients for Salmonella typhi (the only official test organism), and for any additional Gram-negative or Gram-positive asporogenous bacteria must be determined by the AOAC Phenol Coefficient Method on each of 2 samples representing 2 different batches against each bacterium.
(2) Performance standard. The Phenol Coefficient is a numerical value that compares the bactericidal concentration of a disinfectant to the bactericidal concentration of pure phenol. This numerical value is obtained by dividing the greatest dilution of disinfectant killing. S. typhi in 10 minutes, but not in 5 minutes, but the greatest dilution of phenol showing the same results.
(3) Permitted labeling claims.
(a) Phenol coefficient claims are permitted only on labels of those products when the value claimed can be considered meaningful and not misleading. Only when the phenol coefficient of a product, as claimed on the label, can be multiplied by the factor "20" to provide the effective use dilution of the product (as confirmed by the AOAC Use Dilution Method) will the phenol coefficient claim be permitted on the label.
(b) "Phenol Coefficient" tables which list phenol coefficient values for numerous bacteria are frequently included in collateral labeling, such as technical bulletins or brochures for formulated products, technical grad chemicals, and chemicals for manufacturing-use products only. These claims ("Phenol Coefficient" tables) must be prominently prefaced with a statement such as: "The following Phenol Coefficients are intended only to indicate the broad-spectrum activity of the product. This information must not be interpreted as having any relevance to the use patterns recommended, effective dosages, or activity against specific microorganism when used as directed
