Difco™ Desoxycholate Agar, BD Life Sciences

Supplier: BD Life Sciences

227310 227310

90001-928EA 198.51 USD

90001-928 CA90001-928

Difco™ Desoxycholate Agar, BD Life Sciences

Media for Microbiology Dehydrated Media for Microbiology

Desoxycholate Agar is a slightly selective and differential plating medium used for isolating and differentiating gram-negative enteric bacilli.

Peptone provides nitrogen and carbon
Lactose is the fermentable carbohydrate
Sodium chloride and dipotassium phosphate maintain osmotic equilibrium
Sodium desoxycholate inhibits gram-positive bacteria
Ferric citrate and sodium citrate also inhibit growth
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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