Detection medium, useful to discriminate bacteria groups, comprises substrate with specific metabolic activity of gram negative bacteria group, substrate of beta glucosidase/cellobiosidase, and beta glucosidase/cellobiosidase inducer

摘要

Detection medium comprises: a substrate with a specific metabolic activity of a group of gram negative bacteria; a substrate of beta glucosidase or cellobiosidase; and an inducer of beta glucosidase or cellobiosidase, where the inducer is a carbohydrate comprising a carbohydrate bound in position B with glucose or carbohydrate with a sub-unit B-glucoside, preferably cellobiose, cellulose, starch, cellotriose or trehalose. An independent claim is included for a process for discriminating a group of bacteria comprising Citrobacter and another group of gram negative bacteria in a biological sample, comprising inoculating the biological sample on the detection medium to obtain bacterial colonies and identifying the colonies reacting with the substrate of beta-glucosidase as belonging to a group comprising Citrobacter and colonies reacting with gram negative bacteria specific substrate.