Used as a differential broth medium in microbiology to detect carbohydrate fermentation by bacteria. The medium contains dextrose (glucose) and the pH indicator bromcresol purple. When bacteria ferment dextrose, they produce acidic byproducts, causing a color change in the medium from purple to yellow, indicating acid production. This color shift helps identify and differentiate bacterial species based on their metabolic activity, particularly in identifying enteric bacteria and assessing their ability to ferment glucose. Commonly used in clinical labs for biochemical testing and bacterial identification.