DEFAR - Departamento de Farmácia

URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/530

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2013 - 201912020 - 20221

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Autor: search.filters.author.Brandão, Geraldo CélioAssunto: search.filters.subject.Antiviral activity

Resultados da Pesquisa

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    Chromatographic profile of xanthones and flavonoids in the anti-dengue extracts of Fridericia samydoides (Cham.) L.G. Lohmann (Bignoniaceae).
    (2022) Fonseca, Juliane Morais da; Reis, Adriana Cotta Cardoso; Pereira, Guilherme Rocha; Moura, Hélia Maria Marques de; Souza Filho, José Dias de; Silva, Breno de Mello; Brandão, Geraldo Célio
    The flavonoids and xanthones present in the ethanol extracts of leaves and stems of Fridericia samydoides showed that anti-dengue activities in vitro were investigated qualitatively by liquid chromatography–ultraviolet-mass spectrometry in series. Nineteen flavones and fifteen xanthones were detected and characterized on the basis of their fragmentation pattern in the positive and negative ion mode tandem mass spectrometry spectra and ultraviolet bands. Acacetin, chrysin, vitexin, isovitexin, orientin, isoorientin, mangiferin, 2’-O-trans-caffeoylmangiferin, 2’-O-trans-coumaroylmangiferin and 2’-O-trans-cinnamoylmangiferin were identified by comparison with authentic samples. The other compounds detected were tentatively assigned by analysis of the spectral data and by comparison with literature reports. In addition, it performed the fractionation of the leaves extract leading to the isolation of mangiferin, isovitexin and isoorientin. All extracts and isolated compounds inhibited the Dengue virus replication cycle with EC50 less than 25.0 μg/mL for extracts and 272.5, 85.6 and 79.3 μg/mL for mangiferin, isovitexin and isoorientin, respectively.
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    Chemistry and antiviral activity of Arrabidaea pulchra (Bignoniaceae).
    (2013) Brandão, Geraldo Célio; Kroon, Erna Geessien; Souza, Danielle E. R.; Souza Filho, José Dias de; Oliveira, Alaíde Braga de
    The aim of the present work was to carry out a bioguided isolation of antiviral chemical constituents from an ethanol extract of leaves from Arrabidaea pulchra (Cham.) Sandwith (EEAPL) that had shown in vitro activity in a previous screening using DNA and RNA viruses. The activity of EEPAL was evaluated against the DNA viruses Human herpesvirus 1 (HSV-1) and Vaccinia virus Western Reserve (VACV-WR) as well as against the RNA viruses Murine encephalomyocarditis virus (EMCV), and Dengue virus 2 (DENV-2) by the 3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyltetrazolium bromide (MTT) colorimetric assay. Cytotoxicity was determined in LLCMK2 and Vero cells and the Selectivity Indexes (SI) were calculated. The most potent effect was observed against DENV-2 (EC50 46.8 ± 1.6 μg mL−1; SI 2.7). For HSV-1 and VACV-WR EC50 values > 200 μg mL−1 were determined, while no inhibition of the cytopathic effect was observed with EMCV. Bioguided fractionation of EEAPL by partition between immiscible solvents followed by chromatography over a Sephadex LH20 column afforded two arylpropanoid glycosides, verbascoside (AP 1) and caffeoylcalleryanin (AP 2), along with a terpenoid, ursolic acid (AP 3). AP 1 and AP 3 exhibited similar anti-DENV-2 profiles, with SI values of 3.8 and 3.1, respectively, while AP 2 was the most effective anti-DENV-2 constituent, with a SI of 20.0. Our results show that A. pulchra leaves ethanol extract (EEAPL) affords compounds with antiviral activity, mainly against DENV-2.