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M9 Minimal Media Preparation

  1. Dissolve the following salts in about 500mL of ddH2O:
    • 12.8 grams anhydrous Na2HPO4
    • 3.0 grams KH2PO4
    • 0.5 grams NaCl
    • 1.0 gram NH4Cl
  2. Bring the media to approximately 950 ml with ddH2O and pH to 7.4 with NaOH.
  3. Autoclave for 20 minutes on slow exhaust. Store at 4°C when finished.
  4. The following salts were dissolved in 50mL of water and cold filtered with a sterilized 0.22 micron filter:
    • 10.8 grams glucose
    • 0.19g of MgCl2
    • 0.0152 grams CaCl2.2H2O
    • 0.0100 grams Thiamine
    • 0.007g of FeCl2.4H2O
  5. Add the filter sterilized solution into the autoclaved media along with any other additives (e.g. antibiotics). Store at 4°C.