What is meant by the phenol coefficient?
Phenol coefficient(biology definition): the measure of the disinfecting power of a substance, determined by dividing the figure indicating the degree of dilution of the disinfectant that kills a microorganism within a given time by that indicating the degree of dilution of phenol killing the microorganism under similar …
What is a phenol coefficient quizlet?
PHENOL COEFFICIENT. To compare effectiveness of PHENOLICS (phenol-like-disinfectants) with phenol itself. To calculate Phenol Coefficient. Divide Highest dilution of DISINFECTANT that killed microbe in 10 minutes over Highest Dilution of Phenol that killed the microbe in 10 minutes.
What is phenol coefficient Slideshare?
c) Phenol coefficient: • Phenol coefficient of a disinfectant is calculated by dividing the dilution of test disinfectant by the dilution of phenol that disinfects under predetermined conditions. 4- Used to evaluate phenolic type disinfectants only.
What is the purpose of Chick Martin coefficient?
An obsolete method for determining the in vitro efficacy of a disinfectant. A standardised quantity of Salmonella typhi is added to sterilised faeces, and various dilutions of the disinfectant are compared with the efficacy of phenol as a disinfectant, yielding the phenol coefficient.
How do you find the phenol coefficient?
To calculate phenol coefficient, the concentration of phenol at which the compound kills the test organism in 10 minutes, but not in 5 minutes, is divided by the concentration of the test compound that kills the organism under the same conditions (or, probably more common, dividing the dilution factor at which the …
What is RW test?
The Rideal–Walker coefficient, now only of historical interest, is a figure expressing the disinfecting power of any disinfectant. It is the ratio of the dilution of the disinfectant that kills a microorganism to the dilution of phenol that kills the organism in the same time under identical conditions.
What is the purpose of the in use test quizlet?
The in-use test is a method of evaluating antimicrobial agents such as disinfectants or antiseptics.
What is bactericide with example?
noun, plural: bactericides. A substance or agent capable of killing bacteria. Supplement. Examples of bactericides are disinfectants, antiseptics and antibiotics.
How is Chick Martin coefficient calculated?
Chick martin phenol coefficient calculated by dividing the concentration of phenol by the mean concentration of the test disinfectant at which similar presence or absence of growth was recorded.
Which phenol coefficient rating is the best agent?
A chemical agent with a phenol coefficient greater than 1.0 is more effective than phenol, such as chloramine, with phenol coefficients of 133 and 100, respectively.
Why is IMViC test done?
The IMViC tests are a group of individual tests used in microbiology lab testing to identify an organism in the coliform group. The presence of some coliforms indicate fecal contamination. The term “IMViC” is an acronym for each of these tests.
Which media is used for sterility testing?
6. Media for use in sterility testing
- 601. Fluid Thioglycollate Medium (Medium 1) and Soybean-Casein Digest Medium (Medium 2) are the media generally used for tests for sterility.
- 602.
- 603.
- 604.
- 605.
- 606.
- 607.
- 608.
What is the function of the phenol coefficient?
Phenol coefficient. It is a measure of the bactericidal activity of a chemical compound in relation to phenol. When listed numerically, the figure expressing the disinfecting power of a substance by relating it to the disinfecting power of phenol may be a function of the standardized test performed.
What is the molecular formula for the compound phenol?
Phenol is an aromatic organic compound with the molecular formula C 6H 5OH. It is a white crystalline solid that is volatile.
What is the vapor pressure of phenol at 25 °C?
The vapor pressure for phenol is 0.3513 mm Hg at 25 °C, and it has a log octanol/water partitionThe vapor pressure for phenol is 0.3513 mm Hg at 25 °C, and it has a log octanol/water partition coefficient (log Kow) of 1.46. (1) Conversion Factors (only for the gaseous form): To convert concentrations in air (at 25 °C) from ppm to mg/m 3
Which is more effective phenol or disinfectant?
Disinfectants that are more effective than phenol have a coefficient greater than 1; those that are less effective have a coefficient less than 1. ^ a b Baxby, Derrick (2005).