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Additional recommended knowledge
Aesculin is used in a microbiology laboratory to aid in the identification of bacterial species (especially Enterococci).
Aesculin hydrolysis test
Aesculin is incorporated into agar with ferric citrate and bile salts (bile aesculin agar). Hydrolysis of the aesculin forms aesculetin (6,7-dihydroxycoumarin) and glucose. The aesculetin forms dark brown or black complexes with ferric citrate, allowing the test to be read.
Streak the bile aesculin agar and incubate at 37°C for 24 hours. The presence of a dark brown or black halo indicates that the test is positive. A positive test can occur with Enterococcus, Aerococcus and Leuconostoc. Aesculin will fluoresce under long wave ultraviolet light (360nm): hydrolysis of aesculin results in loss of this fluorescence.
Enterococcus will often flag positive within four hours of the agar being inoculated.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Aesculin". A list of authors is available in Wikipedia.|