Further studies of flavonoids in Saxifraga (original) (raw)

The flavonoid composition of Saxifrage cemua, S. micranthidifofia, S. tolmim', and .tn′cuspidatahasbeendetermined.Themajorproportionoftheprofilescomprise•complexmixtureoffiavonol3−O−glycosides,includingmono−,di−,endtrigh/cosides.Keempferol,quercetin,isorhamnetin,andmydcetinwereobservedalthoughnotelltaxahadallaglycones.Thernonoglycosiclefractionof. tn'cuspidata has been determined. The major proportion of the profiles comprise • complex mixture of fiavonol 3-O-glycosides, including mono-, di-, end trigh/cosides. Keempferol, quercetin, isorhamnetin, and mydcetin were observed although not ell taxa had all aglycones. The rnonoglycosicle fraction of .tn′cuspidatahasbeendetermined.Themajorproportionoftheprofilescomprise•complexmixtureoffiavonol3−O−glycosides,includingmono−,di−,endtrigh/cosides.Keempferol,quercetin,isorhamnetin,andmydcetinwereobservedalthoughnotelltaxahadallaglycones.Thernonoglycosiclefractionof. to/mieiwas unusual in that it consisted only of quercatin 3'-Oglucoside and myricetin 7-(~ glucoside; both compounds are unusual for the family. Saxifrage tricuspidata exhibited an unusually complex array of rnonoglycosidas which was comprised of glucosides, galactosides, xylosides, several isomeric arabinosides, and acylated derivatives of some of the arabinosides. The diversity of biosynthetic capacity observed for Sax/fraga (present and earlier data) reflect the complexity described for the Saxifrageae.