Journal
PHYTOCHEMISTRY
Volume 69, Issue 14, Pages 2603-2608Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2008.07.007
Keywords
Halophila johnsonii; Hydrocharitaceae; Flavone glycosides; Flavones; Qualitative analysis
Categories
Funding
- North Carolina Department of Health and Human Services [01505-04]
- National Science Foundation, Division of Biological Infrastructure [DBI-0100085]
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Halophila johnsonii Eiseman is a shallow-water marine angiosperm which contains UV-absorbing metabolites. Studies on methanol extracts of H. johnsonii by means of HPLC-UV, NMR, HPLC-MS resulted in isolation and identification of seven previously unknown flavone glycosides: 5,6,7,T,4',5'-hexahydroxyflavone-7-O-beta-glucopyranoside (1), 5,6,7,3',4',5'-hexahydroxyflavone-7-O-(6 ''-O-acetyl)-beta-glucopyranoside (2), 6-hydroxyluteolin-7-O-(6 ''-O-acetyl)-beta-glucopyranoside (3), 6-hydroxyapigenin-7-O-(6 ''-O-acetyl)-beta-glucopyranoside (4), 6-hydroxyapigenin-7-O-(6 ''-O-[E]-coumaroyl)-beta-glucopiranoside (5), 6-hydroxyapigenin-7-O-(6 ''-O-[E]-caffeoyl)-beta-glucopyranoside (6) and 6-hydroxyluteolin-7-O-(6 ''-O-[E]-coumaroyl)-beta-glucopyranoside (7). Also isolated were three known flavone glycosides, 6-hydroxyluteolin 7-O-beta-glucopyranoside (8), scutellarein-7-O-beta-glucopyranoside (9), and spicoside (10), and five known flavones, pedalitin (11), ladanetin (12), luteolin (13), apegenin (14) and myricetin (15). Qualitative comparison of the flavonoid distribution in the leaf and rhizome-root portions of the plant was also investigated, with the aim of establishing the UV-protecting roles that flavonoids played in the sea grass. (C) 2008 Elsevier Ltd. All rights reserved.
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