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You are here:Home » Culture Media » Media-Microbiological » MacConkey Agar (Powder)

MacConkey Agar (Powder)


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MacConkey agar is a selective and differential medium for detection of coliforms and other enteric organisms.
Catalog #M1100
AppearanceBeige with pale pink tint, homogenous, free-flowing powder.
pH (5%, 25ºC)7.1 ± 0.2
MicrobiologyThe medium was prepared according to formulation and inoculated with the organisms listed below. Cultures were incubated at 35±2°C in an aerobic atmosphere and examined for growth at 18-24 hours.
Enterococcus faecalis ATCC 29212Partial to complete inhibition
Escherichia coli ATCC 25922Growth
Proteus mirabilis ATCC 12453Growth, partial inhibition of swarming
Salmonella typhimurium ATCC 14028Growth
Directions per LiterDissolve 50 grams per liter of distilled/deionized (DDI) water, heating with stirring until completely solubilized. Dispense into appropriate containers, loosen caps and autoclave for 15 minutes at 121ºC (15psi).
Storage and StabilityStore powdered media at RT. Opened bottles should be capped tightly and kept in a dark, low humidity environment. Prepared media should be kept at 4°C and used within a short period of time.
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

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