Potato Dextrose Agar

Merck 110130 Potato Dextrose Agar

Potato Dextrose Agar is used for the cultivation, isolation and enumeration of yeasts and molds from foodstuffs and other materials.

This culture medium complies with the recommendations of the American Public Health Association for food (1992) and the United States Pharmacopeia.

Mode of Action

Carbohydrate and potato infusion (Beever and Bollard 1970) promote the growth of yeasts and molds while the low pH value partially inhibits the growth of the accompanying bacterial flora. If the medium is to be used for fungal counts, the pH should be adjusted to approximately 3.5. Fungi grow on this medium to develop typical morphology.

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