Culture medium and method for identifiying gram-negative microorganisms

摘要

The invention relates to a novel culture medium and a method for the identification of gram-negative microorganisms based on the differentiation of said microorganisms by the appearance of 10 different colors in the colonies, which may be regular or irregular, and halos of at least 5 different colors and sizes. Said medium comprises a mixture of components favoring the appearance of halos of different colors and sizes and consists of siliceous earth, skim milk, starches and activated carbon. The medium according to the invention also comprises a mixture of nutritional bases, substances ensuring the appearance of different colorations in the colonies, substances ensuring inhibition of gram-positive microorganisms and substances providing the necessary solid matrix for the growth and development of the colonies.