The biosynthesis of anthracene
glycosides may be considered under the following two heads, namely:
(a) Emodin and Other
Related Derivatives: The indepth knowledge with regard to the biosynthesis of
anthracene aglycones has been duly established from an elaborated study
with microorganisms, specifically Penicillium islandicum as shown below:
In this particular instance, an
intermediate poly β-ketomethylene acid is assumed to have formed from
8 acetate units which on being subjected to intramolecular condensation gives
rise to anthraquinones i.e.; emodin and other related
derivatives.
(b) Alizarin: Another
metabolic pathway for the formation of anthraquinone is established and recognised
through the shikimic acid—mevalonic acid mediators as could be seen
functional in certain plants belonging to the family Rubiaceae as given
below:
The biosynthesis of alizarin
reveals that the ring A in alizarin molecule has been derived from the
shikimic acid, whereas the ring C in alizarin has been
incorporated by the mevalonic acid component.
Source:Pharmacognosy And Pharmacobiotechnology By Ashutosh Kar
Source:Pharmacognosy And Pharmacobiotechnology By Ashutosh Kar
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