M9 CA Medium pH 7.1

ItemSize List Price Qty
340-017-101 500 mL $30.68


M9 CA Media contains the essentials for bacterial species to grow. Important components of M9 CA medium are the carbon source from glucose, a nitrogen source from ammonia chloride, and electrolytes from sodium, chloride, potassium, calcium, phosphorus and magnesium salts in the M9 solution.

  • Glucose as a carbon source and casamino acids as a nitrogen source.


M9 CA Media is often used to define if a particular microbial species is a heterotroph, namely an organism that does not have any nutritional requirements beyond core sources of carbon (sugars) and nitrogen (to synthesize amino acids and nucleic acid bases).

Auxotrophs, or organisms with nutritional requirements will not be able to grow on minimal media. M9 CA medium supports the growth of recombinant strains of E. coli and wild-type strains of E. coli. Advantageously, M9 medium is inexpensive, low auto-fluorescence (when excited at 488 nm) and low absorbance M9 CA.

M9 Medium is used for the following applications: propagation of E. coli strains, maintaining positive selective pressure on recombinant strains of E. coli with plasmids coding for the ability to produce essential substances such as amino acids or vitamin, and maintaining stocks of F’-containing bacteria for use with M13 bacteriophage.


Supplementing M9 with magnesium and calcium will increase the growth of recombinant E. coli. Also, M9 can be supplemented with specific amino acids or other metabolites to allow for selection of specific auxotrophs


Storage Conditions: 2°C to 8°C

Shipping Condition: ambient temperature

Sterile Filtered

Product and/or packaging contains recycled/renewable content Product and/or packaging is recyclable or reduces waste Product and/or packaging is safer to human and environmental health

UNSPSC: 41106200

Harmonization Code: 3822.00.5090


Max Shelf Life: 24 months

Additional information

Weight 32 oz
Dimensions 3 × 12 × 7 in
Vendor Number


Unit Quantity

500 mL

Product Manufacturer

Quality Biological

Product Documentation

Safety Data Sheet 340-017
Technical Information Sheet 340-017
Formulation 340-017