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Granadaene
Granadaene is the trivial name of a non-isoprenoid polyene that constitutes the red pigment characteristic of Streptococcus agalactiae (group B streptococcus).
== Characteristics ==
Granadaene is an ornithin-rhamno-dodecaene (molecular mass = 676 Da) with a conjugated system made up of a linear chain of 12 conjugated double bonds.
Granadaene is dark red, odorless, insoluble in water, methanol, ethanol, diethyl ether, acetone, hexane, dimethyl sulphoxide (DMSO), acetonitrile, tetrahydrofuran, chloroform, and in most solvents, it is soluble in DMSO–0.1% trifluoroacetic acid (TFA).〔
Granadaene, can be extracted from cultures of ''S.agalactiae'' in granada broth (granada medium without agar) with 0.1 M potassium hydroxide (KOH) and purified by size-exclusion chromatography on Sephadex LH using DMSO–0.1%TFA.〔
The ultraviolet-visible absorption spectrum of the granadaene (in DMSO/TFA) is almost identical to that of a carotene with a similar conjugated system of double bonds (e.g. alpha-carotene), that is why the GBS pigment was considered to be a carotene for many years.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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