| Abstract
| - A new betacyanin endogenously occurring in fruits of nine Mammillaria species, i.e., M. roseo-alba (Boedecker), M. donatii (Berge), M. coronata (Scheidweiler), M. karwinskiana (Martius), M. gummifera (Engelmann), M. infernillensis (Craig), M. centricirrha (Lemaire), M. krameri (Muehlenpfordt), and M. magnimamma (Haworth), was studied by means of spectroscopic techniques. The betacyanin was identified as betanidin 5-O-(6′-O-malonyl)-β-sophoroside for which the trivial name mammillarinin is proposed. In some Mammillaria species this compound was reported as a dominating pig-ment. Except for its epimer, two other isomers of mammillarinin were tentatively identified as betanidin/isobetanidin 5-O-(4′-O-malonyl)-β-sophoroside present in the fruits as acyl migration products.
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