Preparative Purification of Delphinidin 3-0-sambubioside from Roselle (Hibiscus sabdariffa L.) Petals by fast Centrifugation Partition Chromatography
Delphinidin 3-0-sambubioside, a Hibiscus anthocyanin, was isolated from MeOH/TFA dried flower of H. sabdariffa. Its purification on preparative scale was obtained by centrifugal partition chromatography (CPC) using the ternary biphasic solvent systems composed of ethyl acetate/1-butanol/water, acidified by 0.1% of TFA. Stationary phase was ethyl acetate/1-butanol/water (5:5:90; v/v). We tested 4 mobile phases and found that the system acetate/1-butanol/water (40:46:14; v/v) was the best to separate anthocyanin mentioned above. This support-free liquid-liquid chromatographic procedure made it possible to isolate delphinidin 3-0-sambubioside from flower of H. sabdariffa. The antiamyloidogenic activity of the isolated stilbenes was evaluated versus b-amyloid fibrils. delphinidin 3-0-sambubioside was found to be active with 67% inhibition at 10 mM.
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