Patent ID: 7217536

Claim:
A medium for detecting and/or identifying microorganisms with an enzymatic activity selected from the group consisting of esterase activity, osidase activity, peptidase activity, sulfatase activity, phosphatase activity, and mixtures thereof, said medium comprising a culture medium and at least one chromogenic or fluorogenic substrate selected from the group consisting of esterase substrate, osidase substrate, peptidase substrate, sulfatase substrate, phosphatase substrate, and mixtures thereof with the exclusion of substrates comprising a 4-[2-(4-octanoyloxy-3,5-dimethoxyphenyl)vinyl]quinolinium-1-(propan-3-ylcarboxylic acid) cation and an anion, the detecting and/or identifying being based on revealing the presence of the enzymatic activity, wherein said medium: is in a stable, ready-to-use liquid or gel form; and contains: at least one fatty acid sorbitan ester (FASE) or at least one fatty acid (FA) or an FASE/FA mixture as an emulsifying stabilizer, the concentration of (FASE) in the medium in % by weight is greater than or equal to 0.5% and less than or equal to 5%, and at least one solvent (S).