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Antitubercular activity of Arctium lappa and Tussilago farfara extracts and constituents.

Abstract：

ETHNOPHARMACOLOGICAL RELEVANCE:Arctium lappa and Tussilago farfara (Asteraceae) are two plant species used traditionally as antitubercular remedies. The aim of this study was (i) to screen Arctium lappa and Tussilago farfara extracts for activity against Mycobacterium tuberculosis and (ii) to isolate and identify the compound(s) responsible for this reputed anti-TB effect. MATERIALS AND METHODS:The activity of extracts and isolated compounds was determined against Mycobacterium tuberculosis H37Rv using a high throughput spot culture growth inhibition (HT-SPOTi) assay. RESULTS:The n-hexane extracts of both plants, the ethyl acetate extract of Tussilago farfara and the dichloromethane phase derived from the methanol extract of Arctium lappa displayed antitubercular activity (MIC 62.5 μg/mL). Further chemical investigation of Arctium lappa led to the isolation of n-nonacosane (1), taraxasterol acetate (2), taraxasterol (3), a (1:1) mixture of β sitosterol/stigmasterol (4), isololiolide (5), melitensin (6), trans-caffeic acid (7), kaempferol (8), quercetin (9), kaempferol-3-O-glucoside (10). Compounds isolated from Tussilago farfara were identified as a (1:1) mixture of β sitosterol/stigmasterol (4), trans-caffeic acid (7), kaempferol (8), quercetin (9), kaempferol-3-O-glucoside (10), loliolide (11), a (4:1) mixture of p-coumaric acid/4-hydroxybenzoic acid (12), p-coumaric acid (13). All compounds were identified following analyses of their physicochemical and spectroscopic data (MS, (1)H and (13)C-NMR) and by comparison with published data. This is the first report of the isolation of n-nonacosane (1), isololiolide (5), melitensin (6) and kaempferol-3-O-glucoside (10) from Arctium lappa, and of loliolide (11) from Tussilago farfara. Amongst the isolated compounds, the best activity was observed for p-coumaric acid (13) (MIC 31.3 μg/mL or 190.9 μM) alone and in mixture with 4-hydroxybenzoic acid (12) (MIC 62.5 μg/mL). CONCLUSIONS:The above results provide for the first time some scientific evidence to support, to some extent, the ethno-medicinal use of Arctium lappa and Tussilago farfara as traditional antitubercular remedies.

journal_name

J Ethnopharmacol

journal_title

Journal of ethnopharmacology

authors

Zhao J,Evangelopoulos D,Bhakta S,Gray AI,Seidel V

doi

10.1016/j.jep.2014.06.034

subject

Has Abstract

pub_date

2014-08-08 00:00:00

pages

796-800

issue

eissn

0378-8741

issn

1872-7573

pii

S0378-8741(14)00482-6

journal_volume

155

pub_type

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Antitubercular activity of Arctium lappa and Tussilago farfara extracts and constituents.