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Chemical Constituents of the Methanolic Extract of Leaves of Leiothrix spiralis Ruhland and Their Antimicrobial Activity
Department of Biological Sciences, Faculty of Pharmaceutical Sciences, São Paulo State University-UNESP, 14801-902, Araraquara, SP, Brazil
Department of Organic Chemistry, Chemistry Institute, São Paulo State University-UNESP, 14800-900, Araraquara, SP, Brazil
* Author to whom correspondence should be addressed.
Received: 1 November 2011; in revised form: 1 December 2011 / Accepted: 5 December 2011 / Published: 16 December 2011
Abstract: Chemical fractionation of the methanolic extract of leaves of Leiothrix spiralis Ruhland afforded the flavonoids luteolin-6-C-b-D-glucopyranoside (1), 7-methoxyluteolin-6-C-b-D-glucopyranoside (2), 7-methoxyluteolin-8-C-b-D-glucopyranoside (3), 4′-methoxyluteolin-6-C-b-D-glucopyranoside (4), and 6-hydroxy-7-methoxyluteolin (5), and the xanthones 8-carboxymethyl-1,5,6-trihydroxy-3-methoxyxanthone (6), 8-carboxy-methyl-1,3,5,6-tetrahydroxyxanthone (7). Methanolic extract, fractions, and isolated compounds of the leaves of L. spiralis were assayed against Gram-positive (Staphylococcus aureus, Bacillus subtilis and Enterococcus faecalis) and Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, Salmonella setubal and Helicobacter pylori) and fungi (the yeasts Candida albicans, C. tropicalis, C. krusei and C. parapsilosis). We observed the best minimum inhibitory concentration values for the methanolic extract against Candida parapsilosis, for the fraction 5 + 6 against Gram-negative bacteria E. coli and P. aeruginosa, and compound 7 against all tested Candida strains. The methanolic extract contents suggest that this species may be a promising source of compounds to produce natural phytomedicines.
Keywords: Eriocaulaceae; Leiothrix spiralis; phenolic compounds; antimicrobial activity
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Araújo, M.G.F.; Hilário, F.; Nogueira, L.G.; Vilegas, W.; Santos, L.C.; Bauab, T.M. Chemical Constituents of the Methanolic Extract of Leaves of Leiothrix spiralis Ruhland and Their Antimicrobial Activity. Molecules 2011, 16, 10479-10490.
Araújo MGF, Hilário F, Nogueira LG, Vilegas W, Santos LC, Bauab TM. Chemical Constituents of the Methanolic Extract of Leaves of Leiothrix spiralis Ruhland and Their Antimicrobial Activity. Molecules. 2011; 16(12):10479-10490.
Araújo, Marcelo Gonzaga de Freitas; Hilário, Felipe; Nogueira, Leonardo Gorla; Vilegas, Wagner; Santos, Lourdes Campaner dos; Bauab, Taís Maria. 2011. "Chemical Constituents of the Methanolic Extract of Leaves of Leiothrix spiralis Ruhland and Their Antimicrobial Activity." Molecules 16, no. 12: 10479-10490.