Dulcitol Disc is used to differentiate bacteria on their ability to ferment carbohydrates.
Carbohydrate impregnated on the discs when added to culture medium diffuses through the medium. When the microorganism ferments the carbohydrate, acid or acid and gas is produced which lowers the pH of the medium. Indicator in the medium changes the colour; e.g., phenol red changes from red to orange to yellow.
Appearance: High quality absorbent paper discs of 10 mm diameter with printed ‘Du’ on each side of the disc.
