Vogel and Johnson Agar is used for the isolation of staphylococci in a laboratory setting. Vogel and Johnson Agar is not intended for use in the diagnosis of disease or other conditions in humans.
Coagulase-positive staphylococci, primarily Staphylococcus aureus, are among the microorganisms that cause spoilage or chemical changes in cosmetic products. To isolate coagulase-positive, mannitol fermenting staphylococci, Vogel and Johnson modified Tellurite-Glycine Agar by Zebovitz, Evans, and Niven. The modification included increasing mannitol and adding a pH indicator. Vogel and Johnson Agar selects and differentiates coagulase-positive staphylococci that ferment mannitol and reduce tellurite.
Vogel and Johnson (VJ) Agar is specified in standard methods testing for cosmetics and nutritional supplements.
|Enzymatic Digest of Gelatin||10 g|
|Yeast Extract||5 g|
|Dipotassium Phosphate||5 g|
|Lithium Chloride||5 g|
|Phenol Red||0.025 g|
Final pH: 7.2 ± 0.2 at 25°C
Formula may be adjusted and/or supplemented as required to meet performance specifications.
Tellurite Solution (1%) Chapman, 10 mL
Potassium Tellurite, 100 mg
|Product #||Product Description|
|7207A||Vogel and Johnson Agar, 500 g|
|7207B||Vogel and Johnson Agar, 2 kg|
|7207T||Vogel and Johnson Agar, 5 kg|