5,7,3′,4′,5′-Pentahydroxyflavanone in the Bracts of Helichrysum Bracteatum

Chromatographie investigations on Helichrysum bracteatum revealed the presence of threeflavanones in the bracts.Two of them were the well known flavanones naringenin and eriodictyol.The th ird flavanone was identified as the hithertoin nature unknown 5,7,3′,4′,5′-pentahydroxyflavanone.This was accomplished by chromatographic and spectrophotometric comparison with an authentic sample prepared from 3,4,5,2′,4′,6′-hexahydroxy chalcone-2'- glucoside. Moreover, precursor experim ents with suitable white flowering mutants of Matthiola incana and Antirrhinum majus also confirmed that the third compound was identical with 5,7,3′,4′,5′-pentahydroxyflavanone.