1ST PROOF OF ANTHRONE AGLYCONES AND DIASTEREOMERIC ANTHRONE-C-GLYCOSYLS IN FLOWERS AND BRACTS OF ALOE SPECIES

Anthranoids were surveyed in flowers and leaves of 11 Aloe species. Fl ower extracts of five species contained diastereomeric anthrone-C-glyc osyls (aloins, homonataloins, 7-hydroxyaloins, 7-hydroxyaloin acetates ). Anthrone aglycones (aloeemodinanthrone, chrysophanolanthrone) were present in flowers of six species but were not detectable in leaves of the same plants. In Aloe flowers anthranoids are not localized in alo in cells. However, those cells could be identified in the bracts of A. succotrina storing anthrone-C-glycosyls of the 7-hydroxyaloin-type.