COMPOSITION OF AN ANTHOCYAN CONCENTRATE FROM ARONIA-MELANOCARPA ELLIOT - X-RAY-ANALYSIS OF TETRAACETYL PARASORBOSIDE

Following acetylation of an anthocyan concentrate from black chokeberr ies (fruits of Aronia melanocarpa Elliot = Sorbus melanocarpa Heynh., Rosaceae), which is used as a natural food colouring agent, hexa-O-ace tyl-sorbitol, penta-O-acetyl-glucopyranose (1), tetra-O-acetyl-beta-D- glucopyranosyl benzoate (2), and hepta-O-acetyl-amygdalin (7) were det ected by comparison with authentic samples. The structures of the hith erto unknown compounds (tetra-O-acetyl-beta-D-glucopyranosyl)pentan-2- one (3) and hepta-O-acetyl (2-pentanyl)-beta-D-gentiobioside (8) were elucidated from their H-1,H-1- and C-13,H-1-COSY spectra. The structur e of tetra-O-acetyl parasorboside was confirmed by crystal structure a nalysis.