• Decrease font size
  • Return font size to normal
  • Increase font size
U.S. Department of Health and Human Services


  • Print
  • Share
  • E-mail

BAM Media M39: Christensen Citrate Agar

January 2001

Bacteriological Analytical Manual

Christensen Citrate Agar

Sodium citrate3 g
Glucose0.2 g
Yeast extract0.5 g
Cysteine monohydrochloride0.1 g
Ferric ammonium citrate0.4 g
KH2PO41 g
NaCl5 g
Sodium thiosulfate0.08 g
Phenol red0.012 g
Agar15 g
Distilled water1 liter


Suspend ingredients, mix thoroughly and heat with occasional agitation. Boil about 1 min to dissolve ingredients. Fill 16 x 150 mm tubes 1/3 full and cap or plug to maintain aerobic conditions. Autoclave for 15 min at 121°C. Final pH, 6.9 ± 0.2. Before media solidify, incline tubes to obtain 4-5 cm slant and 2-3 cm butt. The Difco formulation does not include ferric ammonium citrate and sodium thiosulfate.


Original Source: Bacteriological Analytical Manual, 8th Edition, Revision A, 1998.