Bacterial Broth Dilution

Bacterial broth dilution is a technique used to determine the minimum inhibitory concentration (MIC) of an antibiotic or other antimicrobial agent on a bacterial culture. This is done by diluting the antibiotic in a liquid nutrient medium, with each successive dilution having a lower concentration of the antimicrobial than the last. After inoculation of specific concentrations of the antimicrobial, bacterial cultures are observed for growth. The lowest concentration of the antimicrobial at which no bacterial growth is observed is referred to as the MIC value. Determining the MIC value of an antimicrobial agent is important in understanding its effects on bacteria, and can help guide the selection of the most effective drug for treating bacterial infection.