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|Author(s):||H. D. Hassanein|
Elsayed W. M.
A. C. Ana
M. M. Abdelmohsen
|Title:||Polyphenolic constituents and antimicrobial activity of Rhapis excels (Arecaceae, Coryphoideae).|
|Abstract:||The chromatographic fractionation of Rhapis excelsa f.,Arecaceae, leaves extract, a plant known aslady palm, resulted in the isolation of four flavonoids: Apigenin-8-C-glucoside (vitexin), Apigenin-6,8-Di-C-βglucopyranoside (vicenin-2), Luteolin-6-C-glucoside (isoorientin) and Luteolin-8-C-glucoside (orientin). Thestructural elucidations of these compounds were performed by means of the comparison of their spectral data(UV systematic identification and 1NMR) with those ones of the literature. Ethyl acetate and butanol fractionsshowed remarkable antioxidant activity (86.2 and 75.6 respectively), when investigated for their DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity. The major polyphenols were identified, as benzoic acid,ferulic acid with others by means of RP-HPLC, they were quantified in methanolic crude extract. Also, theantibacterial activity of the extract was assessed against Staphylococcus aureusstrains, including methicillinresistant S. aureus (MRSA). The extracts had no antimicrobial activity alone but they revealed ability topotentiate the antibacterial activity of ciprofloxacin, tetracycline and oxacillin.|
|Related Information:||info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/00511/2013 - POCI-01-0145-FEDER-006939/Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia/LEPABE|
|Document Type:||Artigo em Revista Científica Internacional|
|Appears in Collections:||FEUP - Artigo em Revista Científica Internacional|
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