Acylated flavonol glycosides from Eugenia jambolana leaves

Acylated flavonol glycosides from Eugenia jambolana leaves

Two acylated flavonol glycosides and 15 known polyphenols have been isolated and identified from the leaves of Eugenca jambolana Lam. The structures of the new compounds were identified as 3-O-(4″-O-acetyl)-α-l-rhamnopyranoside of mearnsetin (myricetin 4′-methyl ether) and myricetin 3-O-(4″-O-acetyl...

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Bibliographic Details
Published in:Phytochemistry (Oxford) Vol. 58; no. 8; pp. 1239 - 1244
Main Authors: Mahmoud, Ibrahim I, Marzouk, Mohamed S.A, Moharram, Fatma A, El-Gindi, Mohamed R, Hassan, Amel M.K
Format: Journal Article
Language:English
Published: Amsterdam Elsevier Ltd 01-12-2001
Elsevier
Subjects:
Acylated flavonol glycosides
Acylation
Biological and medical sciences
Chemical constitution
ESI–MS
Eugenia jambolana
Flavonoids - chemistry
Flavonoids - isolation & purification
Flavonols
Fundamental and applied biological sciences. Psychology
ID and 2D NMR
Leaves
Myrtaceae
Phenols - chemistry
Phenols - isolation & purification
Plant Leaves - chemistry
Plant physiology and development
Polymers - chemistry
Polymers - isolation & purification
Syzygium - chemistry
Eugenia jambolana
Myrtaceae
Acylated flavonol glycosides
ID and 2D NMR
Leaves
ESI–MS
Polyphenol
Molecular structure
Dicotyledones
Angiospermae
Isolation
Spermatophyta
Plant leaf
Glycoside
Flavone(3-hydroxy)
Medicinal plant
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Summary:Two acylated flavonol glycosides and 15 known polyphenols have been isolated and identified from the leaves of Eugenca jambolana Lam. The structures of the new compounds were identified as 3-O-(4″-O-acetyl)-α-l-rhamnopyranoside of mearnsetin (myricetin 4′-methyl ether) and myricetin 3-O-(4″-O-acetyl-2″-O-galloyl)-α-l-rhamnopyranoside. The complete structure elucidation of all isolated metabolites based on chemical and spectroscopic methods of analysis (UV, 1D and 2D NMR) as well as negative ESI–MS with and without CID in-source fragmentation. Two acylated flavonol rhamnosides were isolated and identified from Eugenia jambolana leaves together with 15 other known polyphenolic metabolites. All structures were confirmed using negative ESI–MS, 1D and 2D NMR analyses.
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ISSN:0031-9422
1873-3700
DOI:10.1016/S0031-9422(01)00365-X