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Half maximal inhibitory concentration (IC 50) is a measure of the potency of a substance in inhibiting a specific biological or biochemical function. IC 50 is a quantitative measure that indicates how much of a particular inhibitory substance (e.g. drug) is needed to inhibit, in vitro , a given biological process or biological component by 50% ...
This is the zone of inhibition. In general, larger zones of inhibition correlate with lower minimum inhibitory concentrations (MICs) of antibiotic or extract for that bacterial strain. [1] An exception to this is when molecules of the antibiotic or extract are large or hydrophobic because these diffuse through the agar slowly. [6]
A plastic strip impregnated with different concentrations of antibiotics is placed on a growth medium, and the growth medium is viewed after a period of incubation. [5] The minimum inhibitory concentration can be identified based on the intersection of the teardrop-shaped zone of inhibition with the marking on the strip. [5]
Like the Clinical and Laboratory Standards Institute, EUCAST offers guidelines to interpret raw minimum inhibitory concentrations (MICs), the lowest concentration of a chemical, usually a drug, which prevents visible growth of bacterium.
Agar dilution is one of two methods (along with broth dilution) used by researchers to determine the minimum inhibitory concentration (MIC) of antibiotics. It is the dilution method most frequently used to test the effectiveness of new antibiotics when a few antibiotics are tested against a large panel of different bacteria. [1]: 149 [2]
In microbiology, the minimum inhibitory concentration (MIC) is the lowest concentration of a chemical, usually a drug, which prevents visible in vitro growth of bacteria or fungi. [ 1 ] [ 2 ] MIC testing is performed in both diagnostic [ 1 ] [ 2 ] and drug discovery laboratories.
Varying concentrations of the antibiotics and the bacteria to be tested are then added to the plate. The plate is then placed into a non-CO 2 incubator and incubated at thirty-seven degrees Celsius for sixteen to twenty hours. Following the allotted time, the plate is removed and checked for bacterial growth.
The EC 10 and EC 90 concentrations to induce 10% and 90% maximal responses are defined similarly. There is a wide range of EC 50 values of drugs; they are typically anywhere from nM to mM. Hence, it is often more practical to refer to the logarithmically transformed p EC 50 values instead of EC 50 , where