RESUMO
In this study, we specifically focused on the crude methanolic leaf extract of Byrsonima coccolobifolia, investigating its antifungal potential against human pathogenic fungi and its antiviral activity against COVID-19. Through the use of high-performance liquid chromatography coupled with electrospray ionization ion trap tandem mass spectrometry, direct infusion electrospray ionization ion trap tandem mass spectrometry, and chromatographic dereplication procedures, we identified galloyl quinic acid derivatives, catechin derivatives, proanthocyanidins, and flavonoid glycosides. The broth dilution assay revealed that the methanolic leaf extract of B. coccolobifolia exhibits antifungal activity against Cryptococcus neoformans (IC50 = 4 µg/mL). Additionally, docking studies were conducted to elucidate the interactions between the identified compounds and the central residues at the binding site of biological targets associated with COVID-19. Furthermore, the extract demonstrated an in vitro half-maximum effective concentration (EC50 = 7 µg/mL) and exhibited significant selectivity (>90%) toward SARS-CoV-2.
Assuntos
COVID-19 , Extratos Vegetais , Humanos , Extratos Vegetais/farmacologia , Extratos Vegetais/química , Antifúngicos , Estrutura Molecular , SARS-CoV-2 , Espectrometria de Massas por Ionização por Electrospray/métodos , Metanol , Antivirais/farmacologia , Cromatografia Líquida de Alta Pressão/métodosRESUMO
Four novel oxylipins (1-4) were isolated from the n-butanol extract of the corms of Dracontium loretense. Their structures were assigned by 1D and 2D NMR analyses and electrospray ionization multistage ion trap mass spectrometry (ESI-ITMS(n)) data. Relative configurations were assigned on the basis of combined analysis of homonuclear and heteronuclear (2,3)J couplings, along with ROE data. Oxylipin 2 exhibited an immunostimulatory effect on human PBMC proliferation.
Assuntos
Adjuvantes Imunológicos/isolamento & purificação , Leucócitos Mononucleares/efeitos dos fármacos , Oxilipinas/isolamento & purificação , Plantas Medicinais/química , Adjuvantes Imunológicos/sangue , Adjuvantes Imunológicos/química , Adjuvantes Imunológicos/farmacologia , Humanos , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Oxilipinas/sangue , Oxilipinas/química , Oxilipinas/imunologia , Peru , Espectrometria de Massas por Ionização por ElectrosprayRESUMO
Liquid chromatography-electrospray ionization multistage ion trap mass spectrometry (LC-ESI-IT-MS(n)) was used to analyze the secondary metabolites in the methanol extract of the capitulae of Eriocaulon ligulatum. The major components were mono- and diglycosides of flavonoids and naphthopyranones. Eleven compounds, including four new flavonol glycosides, were identified based on their fragmentation patterns in MS experiments and on NMR analysis of the isolated compounds. The described data may contribute to a better understanding of the taxonomic classification of the Eriocaulaceae family.
Assuntos
Cromonas/química , Eriocaulaceae/química , Flavonoides/química , Naftalenos/química , Cromatografia Líquida de Alta Pressão , Cromonas/isolamento & purificação , Flavonoides/isolamento & purificação , Espectroscopia de Ressonância Magnética , Naftalenos/isolamento & purificação , Espectrometria de Massas por Ionização por Electrospray , Espectrofotometria Ultravioleta , Espectrometria de Massas em TandemRESUMO
A rapid analytical approach suitable to achieve a comprehensive characterization of the compounds present in the infusion prepared from the leaves of Byrsonima fagifolia Niedenzu (Malpighiaceae), a Brazilian plant used as an infusion to treat gastric disorders, was developed. The method was based on high-performance liquid chromatography coupled to electrospray negative ionisation multistage ion trap mass spectrometry (HPLC/ESI-ITMSn). The main ions in the ESI-ITMS spectra were attributed to a quinic acid core containing from one to five galloyl units. Quercetin derivatives containing one and two sugar moieties as well as galloyl esterification were also detected. These results indicated that HPLC/ESI-ITMSn is easily applicable to infusions of this plant and allows the rapid and direct identification of these compounds in crude plant extracts.