Tannins, flavonoids and stilbenes in extracts of African savanna woodland trees Terminalia brownii, Terminalia laxiflora and Anogeissus leiocarpus showing promising antibacterial potential

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Salih , E Y A , Kanninen , M , Sipi , M , Luukkanen , O , Hiltunen , R , Vuorela , H , Julkunen-Tiitto , R & Fyhrqvist , P 2017 , ' Tannins, flavonoids and stilbenes in extracts of African savanna woodland trees Terminalia brownii , Terminalia laxiflora and Anogeissus leiocarpus showing promising antibacterial potential ' , South African Journal of Botany , vol. 108 , pp. 370-386 . https://doi.org/10.1016/j.sajb.2016.08.020

Title: Tannins, flavonoids and stilbenes in extracts of African savanna woodland trees Terminalia brownii, Terminalia laxiflora and Anogeissus leiocarpus showing promising antibacterial potential
Author: Salih, E.Y.A.; Kanninen, M.; Sipi, M.; Luukkanen, O.; Hiltunen, R.; Vuorela, H.; Julkunen-Tiitto, R.; Fyhrqvist, P.
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Faculty of Pharmacy
University of Helsinki, Faculty of Pharmacy
University of Helsinki, Faculty of Pharmacy
Date: 2017
Language: eng
Number of pages: 17
Belongs to series: South African Journal of Botany
ISSN: 0254-6299
URI: http://hdl.handle.net/10138/309922
Abstract: Terminalia laxiflora, Terminalia brownii and Anogeissus leiocarpus are used as decoctions, macerations, infusions and fumigations in East and West African traditional medicine for treatment of infectious diseases and their symptoms. Using this ethnopharmacological information as a guideline for our research and owing to the fact that these species have not been subjected to in depth antibacterial and phytochemical studies, thirty-nine extracts of various polarities of the stem bark, stem wood and roots were studied for growth inhibitory effects against the human pathogenic bacteria Staphylococcus epidermidis, Staphylococcus aureus, Micrococcus luteus and Pseudomonas aeruginosa. Our results indicate that the studied species contain antibacterial compounds of a wide range of polarities. All polar root extracts of T. laxiflora and various polar extracts of T. brownii roots, including hot water decoctions, gave broad-spectrum antibacterial effects and low MIC values of 39 mu g/ml. The main ellagitannins in an ethyl acetate extract of the root of T. laxiflora were found to be corilagin and its derivative and punicalagin. A methanol extract of the roots of T. brownii contained methyl-(S)-flavogallonate and its derivative as the main identified ellagitannins. Moreover, both Terminalia species were found to contain ellagic acid xylopyranoside and methyl ellagic acid xyloside and pure ellagic acid was present in T. brownii. Pure punicalagin did not give as low MIC as an ethyl acetate extract of the roots of T. laxiflora, containing punicalagin as one of its main compounds, although this ellagitannin totally inhibited the growth of S. aureus at 125 mu g/ml and P. aeruginosa at 500 mu g/ml. Similarly, pure ellagic and gallic acid gave higher MIC values than the methanolic root extract of T. brownii against S. aureus and P. aeruginosa. Moreover, a Sephadex LH-20 fraction of the methanolic extract of the roots of T. brownii, enrichedwithmethyl-(S)-flavogallonate and its isomer, gave higher MIC values than the crude methanolic extract. These results suggest that the polyphenols in the extracts might act synergistically with each other. A methanolic soxhlet extract of the roots of A. leiocarpus, containing ampelopsin, aromadendrin, taxifolin, pinosylvin and 4'-methylpinosylvin gave a low MIC value of 39 mu g/ml against all bacterial strains used in this investigation. Our results demonstrate that the roots, stem bark and stem wood of T. brownii, T. laxiflora and A. leiocarpus are rich sources of (new) antimicrobial compounds and justify the uses of these plants for treatment of infections in African traditional medicine.
Subject: 317 Pharmacy
4112 Forestry
1183 Plant biology, microbiology, virology
Terminalia laxiflora
Terminalia brownii
Anogeissus leiocarpus
Antibacterial
Africa
Polyphenols
RESISTANT STAPHYLOCOCCUS-AUREUS
PERFORMANCE LIQUID-CHROMATOGRAPHY
ANTI-HELICOBACTER-PYLORI
MEDICINAL-PLANTS
ANTIMICROBIAL ACTIVITY
HYDROLYZABLE TANNINS
IN-VITRO
PSEUDOMONAS-AERUGINOSA
ANTINEOPLASTIC AGENTS
COMBRETUM-CAFFRUM
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