Bactericidal Concentration
Bactericidal Concentration - Related Videos
05:40
A Serum Bactericidal Assay for the Complement-Mediated Bactericidal Activity of Antibodies
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2025
This video demonstrates a technique to evaluate the complement-mediated bactericidal activity of antibodies present in serum. This approach combines isolated serum with pathogenic bacteria and exogenous complement proteins. Upon incubation, the bacteria are grown on an agar plate, and the produced colonies are quantified to measure the serum bactericidal titer.
06:36
Establishing the Minimal Bactericidal Concentration of an Antimicrobial Agent for Planktonic Cells (MBC-P) and Biofilm Cells (MBC-B)
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Cited by 63 •
2014
This protocol allows for a direct comparison between planktonic and biofilm resistance for a bacterial strain that can form a biofilm in vitro using a 96-well microtiter plate. Planktonic or biofilm bacteria are exposed to serial dilutions of the antimicrobial agent of choice. Viability is assayed by growth on agar plates.
02:55
Determining the Role of Vitronectin in Bacterial Resistance to Bactericidal Activity of Human Serum
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2025
This video demonstrates the role of vitronectin, a human serum glycoprotein, on bacterial resistance. Antibodies in the serum interact with bacterial surface proteins, activating complement proteins and forming the membrane attack complex, causing bacterial cell lysis. Vitronectin binding on bacterial membrane protein prevents the membrane attack complex formation, resulting in bacterial survival.
06:11
A High-throughput Shigella-specific Bactericidal Assay
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Cited by 6 •
2019
Here we present a protocol to measure Shigellacidal activity of antibodies in serum. Serum is mixed with bacteria and exogenous complement, incubated, and the reaction mixture is plated on agar plates. Viable bacteria form colonies which are counted, using an automated colony enumerator, and used to determine the bactericidal titer.
02:41
Concentration Cells
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2020
A concentration cell is a type of a voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species. Consider the following voltaic cell: From the given information, the cell potential of this concentration cell can be calculated using...
FAQs
MIC and bactericidal concentration answer different questions about the same intervention. MIC identifies the level that inhibits bacterial growth, whereas MBC reflects the lowest tested level associated with no regrowth on drug-free agar. Their relationship helps indicate whether an antimicrobial primarily suppresses growth or eliminates viable cells, which matters when evaluating treatment effectiveness.
Growth can stop while viable bacterial cells remain present. Transferring material from inhibitory wells to drug-free agar removes the antimicrobial pressure and tests whether those cells recover. If regrowth occurs, inhibition did not establish killing at that concentration; absence of regrowth provides the basis for identifying bactericidal activity.
Using a range of antimicrobial levels shows how the outcome changes as exposure becomes stronger. Investigators first identify wells in which growth is inhibited, then assess those samples for regrowth after transfer. This two-stage comparison links concentration to both growth suppression and loss of recoverable bacterial cells.
An assay begins by exposing bacteria to a series of antimicrobial concentrations. Wells showing inhibited growth are selected, and samples from them are transferred onto drug-free agar. After incubation, the lowest concentration whose transfer shows no regrowth is recorded as the MBC. This workflow connects liquid exposure with viable-cell recovery.
MBC measurements provide an effectiveness metric for comparing antimicrobial materials, coatings, delivery systems, and engineered therapeutics. A design that only inhibits growth may perform differently from one that eliminates viable cells. Incorporating MBC results therefore helps bioengineers assess whether an intervention achieves the intended level of bacterial control.
The measurement is relevant when developing antimicrobial surfaces, coatings, delivery systems, or engineered therapeutics. Testing these interventions against bacterial growth and subsequent regrowth can reveal whether their activity is mainly bacteriostatic or bactericidal. That information supports evaluation of treatment effectiveness and the design of safer infection-control technologies.