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Title: A new flavonol derivative and other compounds from the leaves of Bauhinia thonningii Schum with activity against multidrug-resistant bacteria
Authors: Nouemsi, Guy Raphael Sado
Jouda, Jean-Bosco
Leutcha, Peron Bosco
Matieta, Valaire Yemene
Tsague Tankeu, Virginie Flaure
Ngnouzouba Kuete, Jenifer Reine
Lannang, Alain Meli
Keywords: Bauhinia thonningii
antibacterial activity
Antimicrobial Activity
Issue Date: 2022
Publisher: Taylor & Francis Ltd
Abstract: Investigation of the leaves of Bauhinia thonningii Schum led to the isolation and identification of a new flavonol derivative, 6-C-methylquercetin-3,4'-dimethyl ether (1) together with eleven known compounds (2-13), with two of them (10 and 11) obtained as a mixture. Their structures were established by extensive spectroscopic analyses. Antibacterial activity of compound 1 as well as the reference antibiotic, ciprofloxacin was tested on Gram-negative multidrug-resistant bacteria overexpressing active efflux pumps, and against methicillin-resistant strains of Staphylococcus aureus (MRSA). Samples were tested alone and in combination with an efflux pump inhibitor (EPI), phenylalanine-arginine-beta-naphthylamide (PAssN). Results show that when compound 1 was tested alone, its inhibitory effects were obtained on 7/10 tested bacteria with the highest MIC value of 128 mu g/mL whilst in the presence of EPI, this activity significantly increase in all the 10 bacteria. An interesting antibacterial activity was obtained with compound 1 against Klebsiella pneumoniae ATCC11296 (MIC of 4 mu g/mL), KP55 and Staphylococcus aureus MRSA6 in the presence of the PassN.
ISSN: 1478-6419
Appears in Collections:Kimya Bölümü Koleksiyonu
PubMed İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu

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