Flavonoids astragalus

Yahara, S., Kotjyoume, M., and Kohoda, H., Flavonoid glycosides and saponins from Astragalus shikokianus, Phytochemistry, 53, 469, 2000. 

Advances in research are performed on the genus Astragalus and about 100 different species have been chemically studied imtill now [249]. The genus appears highly uniform from a chemical point of view, with three kinds of biologically active principles and three diffent groups of toxic compounds. The active constituents are saponins, flavonoids, and polysaccharides, while nitro-compoimds, indolizidine alkaloids and the seleniferous derivatives are included in the poisonous groups. 

Flavonoids isolated firom Astragalus spp. belong to the following classes of constituents flavones, flavonols, flavanones, isoflavones and isoflavans, all as aglycones than glycosides, and pterocarpans (Table 5). 

TABLE 5. Flavonoids, Aglycones and Glycosides, from Astragalus spp. 

All Astragalus spp., investigated untill now for their flavonoid content, are listed in Table (6). 

Astragalus contains flavonoids, polysaccharides, and triterpenoid saponins or astragalosides (39). PG2, a polysaccharide fraction from this plant, was tested... 

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