Isolation and structure determination of a sesquiterpene lactone (vernodalinol) from Vernonia amygdalina extracts.

Abstract:

CONTEXT:Vernonia amygdalina Del. (VA; Asteraceae or Compositae) is a small tree growing throughout tropical Africa. It is widely used for food and medicinal purposes by local people. It was reported that it had several qualities, including anticancer activity. OBJECTIVE:A sesquiterpene lactone, vernodalinol, was isolated from VA leaves. The first reported source of vernodalinol was in 2009 from a different plant, only (1)H NMR spectrum and no detailed structural analysis were carried out. No whole spectroscopic data were provided. MATERIALS AND METHODS:VA dried leaves were extracted with 85% ethanol followed by further separation into four fractions by liquid-liquid extraction technique using various solvents: hexane, chloroform, and n-butanol. Vernodalinol was separated from the n-butanol fraction by column chromatography. The biological activity of vernodalinol was evaluated in estrogen receptor-positive (ER(+)) human breast carcinoma cells (MCF-7) in vitro. RESULTS:Results indicated that vernodalinol (25 and 50 μg/mL) inhibited breast cancerous cell growth (DNA synthesis) by 34% (P < 0.025) and 40% (P < 0.025), respectively. It is reasonable to expect an LC(50) of 70-75 μg/mL for vernodalinol in MCF-7 cells. DISCUSSION AND CONCLUSION:Vernodalinol structure was confirmed using a battery of spectroscopic methods, 1D and 2D NMR, high-resolution mass spectrometry (HR-MS), UV, IR, and X-ray. These results suggest that vernodalinol, although it has some biological activity, is likely to work in concert with other ingredients responsible for the anticancer activity exhibited of VA.

journal_name

Pharm Biol

journal_title

Pharmaceutical biology

authors

Luo X,Jiang Y,Fronczek FR,Lin C,Izevbigie EB,Lee KS

doi

10.3109/13880209.2010.523429

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

464-70

issue

5

eissn

1388-0209

issn

1744-5116

journal_volume

49

pub_type

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