Vogel & Johnson (VJ) Agar (Difco)

VJ Agar, also known as Vogel and Johnson Agar, is used for the early detection of coagulase-positive, mannitol-fermenting staphylococci.

Principles Peptone is a source of carbon, nitrogen, vitamins and minerals. Yeast extract supplies B-complex vitamins which stimulate bacterial growth. Mannitol is the carbohydrate. Inhibition of nonstaphylococcal organisms is achieved by the potassium tellurite additive, which is inhibitory for some species of both gram-positive and gram-negative bacteria, by lithium chloride and by the high glycine content. Staphylococci may be slightly inhibited by the presence of the three inhibitors; however, this is compensated for by the addition of mannitol and glycine. Phenol red is the pH indicator and agar is the solidifying agent.

Coagulase-positive staphylococci reduce the potassium tellurite to metallic free tellurium, producing colonies that are gray-black. The fermentation of mannitol by coagulase-positive staphylococci is detected by a change in the color of the phenol red indicator from red (alkaline) to yellow (acid).

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Item No. Product Description Brand Name Size Mfr. Item No. Unit of Measure Your Cost Purchase
Vogel & Johnson Agar Detection of coagulase-positive and mannitol-positive Staphylococcus aureus.
3078-55
Detection of coagulase-positive and mannitol-positive Staphylococcus aureus. Difco 500 gram 256220 Each
$283.26/EA
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