(Delphinidin 3-gentiobiosyl) (luteorin 7-glucosyl) malonate from the flowers of Eichhornia crassipes
An additional new pigment exhibiting anthocyanin and flavone disubstituted malonate structure, was isolated from the blue-purple flowers of Eichhornia crassipes as a minor anthocyanin. This pigment was identified as (6"'-O-(delphinidin 3-O-(6"-O-(beta-D-glucopyranosyl)-beta-D-glucopyr...
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Published in | Heterocycles Vol. 63; no. 4; pp. 899 - 902 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
OXFORD
Elsevier
01.04.2004
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Subjects | |
Online Access | Get more information |
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Summary: | An additional new pigment exhibiting anthocyanin and flavone disubstituted malonate structure, was isolated from the blue-purple flowers of Eichhornia crassipes as a minor anthocyanin. This pigment was identified as (6"'-O-(delphinidin 3-O-(6"-O-(beta-D-glucopyranosyl)-beta-D-glucopyranosyl))) (6"-O-(luteolin 7-O-(beta-D-glucopyranosyl))) malonate by chemical and spectroscopic methods. The lambdamax of this pigment is 547 nm in 0.1% HCl-MeOH, where the negative cotton effect is also observed as similar to that of Eichhornia anthocyanin A, (delphinidin 3-gentiobiosyl) (apigenin 7-glucosyl) malonate previously isolated from the same flowers. This result supports that the new pigment also takes a folding conformation between delphinidin (chromophore) and luteorin (co-pignmet). |
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ISSN: | 0385-5414 |
DOI: | 10.3987/com-04-10013 |