Aesculin
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IUPAC name
7-hydroxy-6-{[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy- 6-(hydroxymethyl)-2-tetrahydropyranyl]oxy}-2-chromenone
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| Other names
Esculetin 6-β-D-glucoside
6,7-dihydroxycoumarin 6-β-D-glucoside 6,7-dihydroxychromen-2-one 6-β-D-glucoside |
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3D model (Jmol)
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| ECHA InfoCard | 100.007.744 |
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PubChem CID
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| Properties | |
| C15H16O9 | |
| Molar mass | 340.282 g/mol |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
Aesculin, also rendered Æsculin or Esculin, is a coumarin glucoside that naturally occurs in the horse chestnut (Aesculus hippocastanum),California buckeye (Aesculus californica),Prickly Box (Bursaria spinosa) and in daphnin (the dark green resin of Daphne mezereum). It is also found in dandelion coffee.
As medication, aesculin is sometimes used as a vasoprotective agent.
Aesculin is also used in a microbiology laboratory to aid in the identification of bacterial species (especially Enterococci and Listeria). In fact, all strains of Group D Streptococci hydrolyze æsculin in 40% bile.
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.
The bile aesculin agar is streaked and incubated 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 . Aesculin will fluoresce under long wave ultraviolet light (360 ): hydrolysis of aesculin results in loss of this fluorescence.
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