Difco™ Desoxycholate Lactose Agar, BD Life Sciences

Supplier: BD Life Sciences

242010 242010

90003-268EA 184.69 USD

CA90003-268 90003-268

Difco™ Desoxycholate Lactose Agar, BD Life Sciences

Media for Microbiology Dehydrated Media for Microbiology

Desoxycholate Lactose Agar is a slightly selective and differential plating medium used for isolating and differentiating gram-negative enteric bacillia and for enumerating coliforms from water, wastewater, milk, and dairy products.

Peptone provides nitrogen and carbon
Lactose is the fermentable carbohydrate
Sodium chloride maintains osmotic equilibrium
Sodium desoxycholate and sodium citrate inhibit gram-positive bacteria
Neutral red is a pH indicator
Agar is the solidifying agent

Differentiation of enteric bacilli is based on fermentation of lactose. Bacteria that ferment lactose produce acid and, in the presence of neutral red, form red colonies. Bacteria that do not ferment lactose form colorless colonies. The majority of normal intestinal bacteria ferment lactose, while Salmonella and Shigella species do not ferment lactose.

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