EC Medium, Modified - 7506

Item No.  7506A

In stock
Out of stock
Expect availability in 2-4 weeks
EC Medium, Modified is used with novobiocin for the selective pre-enrichment of Escherichia coli O157:H7 in a laboratory setting. EC Medium, Modified is not intended for use in the diagnosis of disease or other conditions in humans. EC Medium was developed by Hajna and Perry in an effort to improve the methods for the detection of the coliform group and E. coli. This medium consists of a buffered lactose broth with the addition of 0.15% Bile Salts Mixture. Growth of spore-forming bacteria and fecal streptococci were inhibited by the bile salts. EC Medium, Modified with the addition of novobiocin was first described by Okrend and Rose. Okrend and Rose modified EC Medium by reducing the Bile Salts Mixture concentration to 1.12% and adding 20 mg/L of sodium novobiocin. Okrend and Rose et al. reported this formulation, which they called Modified EC & Novobiocin (mEC&N), was beneficial in the enrichment and detection of E. coli O157:H7 from meats and poultry, and is currently recommended by the U.S.D.A.  
Brand Acumedia®
Formula Liter
Enzymatic Digest of Casein 20 g
Lactose 5 g
Bile Salts Mixture 1.12 g
Dipotassium Phosphate 4 g
Monopotassium Phosphate 1.5 g
Sodium Chloride 5 g
Mass 500 g
Package Dimensions 3.60 IN x 3.60 IN x 6.50 IN
Package Weight 0.50 LB
  1. Dissolve 36.6 g of the medium in one liter of purified water.
  2. Mix thoroughly.
  3. Autoclave at 121°C for 15 minutes.
  4. Cool to room temperature and add 10 mL of the Novobiocin Supplement (# 7985).
  5. Dispense aseptically into sterile tubes containing an inverted fermentation Durham tube.




Our experts are here to help. If you need information beyond what is provided in Validation Reports under the Documents tab, please contact us and we will be happy to assist you. Learn more