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7H9 (and its solid counterpart, 7H10 agar) are selective media used for the culture of free-living mycobacteria such as M. tuberculosis and M. smegmatis.


  • Deionized water
  • 4.7g Middlebrook 7H9 powder (DifCo catalog # 0713-01-7)
  • 5mL 10% Tween-80: Dilute 40g Tween-80 (liquid) into final volume 200mL with deionized water. Stir on low heat (~65°C) until completely dissolved (may take ~15 minutes). Filter sterilize with a 0.22μm filter. Store at 4°C wrapped in aluminum foil, as Tween is light sensitive.

For M. tuberculosis:

  • 100mL OADC (Dubos/Middlebrook Oleic Acid Albumin Dextrose Complex)
  • 10mL 50% glycerol
  • (If you are using lung homogenates or the like) 10mL 10mg/mL cyclohexamide

For M. smegmatis:

  • 100mL ADS (Albumin-Dextrose-Saline): 8.1g NaCl, 50g Bovine Serum Albumin Fraction V, 20g anhydrous dextrose in 1L deionized water. Filter sterilize in a 0.22μm filter, and store at 4°C.
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