RESUMO
The present study investigates the chemical composition, anti-inflammatory, and antihypertensive activities, inâ vitro, from extracts of Cuphea lindmaniana and Cuphea urbaniana leaves. The extraction was performed ultrasound-assisted, and UHPLC/MS analysis was in positive mode ionization. The anti-inflammatory activity of the extracts and miquelianin were assayed at concentrations 0.001-10â µg/mL by chemotaxis on rat polymorphonuclear neutrophils. The antihypertensive activity was performed by angiotensin-converting enzyme (ACE) inhibition. From the nineteen proposed compounds, six of them are described for the first time in this genus. The extracts displayed antichemotactic effect with a reduction of 100 % of the neutrophil migration, inâ vitro, in most concentrations. The ACE-inhibition presented results ranging from 19.58 to 22.82 %. In conclusion, C. lindmaniana and C. urbaniana extracts contain a rich diversity of flavonoids and display inâ vitro anti-inflammatory and antihypertensive potential. Thus, this study could serve as a scientific baseline for further investigation, on developmental novel products with therapeutic actions.
Assuntos
Inibidores da Enzima Conversora de Angiotensina/farmacologia , Anti-Inflamatórios/farmacologia , Anti-Hipertensivos/farmacologia , Cuphea/química , Neutrófilos/efeitos dos fármacos , Extratos Vegetais/farmacologia , Polifenóis/farmacologia , Inibidores da Enzima Conversora de Angiotensina/química , Inibidores da Enzima Conversora de Angiotensina/isolamento & purificação , Angiotensinas/antagonistas & inibidores , Angiotensinas/metabolismo , Animais , Anti-Inflamatórios/química , Anti-Inflamatórios/isolamento & purificação , Anti-Hipertensivos/química , Anti-Hipertensivos/isolamento & purificação , Lipopolissacarídeos/antagonistas & inibidores , Lipopolissacarídeos/farmacologia , Extratos Vegetais/química , Extratos Vegetais/isolamento & purificação , Polifenóis/química , Polifenóis/isolamento & purificação , RatosRESUMO
Cuphea genus (Lythraceae) popularly known in Brazil as "sete-sangrias", it's described as antimicrobial, anti-inflammatory, diuretic and antihypertensive mainly. Investigating the chemotactic ability plays an important role in the identification of new anti-inflammatory agents. Thus, this research aims to assay the antichemotactic activity of hydroethanolic extracts of C. calophylla, C. carthagenensis, C. glutinosa, and C. racemosa as well as the compounds miquelianin and myricitrin. The antichemotactic activity of the hydroethanolic extracts, miquelianin, and myricitrin were assayed at concentrations 0.001 to 10 µg/mL in the lipopolysaccharide-induced chemotaxis on rat polymorphonuclear neutrophils. All the assayed samples displayed antichemotactic activity with reduction of the neutrophil migration in the range of 4.46-100%, and an IC50 value in the range of 0.30-1.24 µg/mL. Thus, this study demonstrates that the extracts hydroethanolic of Cuphea species, miquelianin, and myricitrin display a significant antichemotactic activity. Therefore, in future studies, extracts from Cuphea spp. could be used as anti-inflammatory drugs.
Assuntos
Cuphea , Animais , Anti-Inflamatórios/farmacologia , Anti-Hipertensivos , Lipopolissacarídeos , Extratos Vegetais/farmacologia , RatosRESUMO
Atropine is an antimuscarinic alkaloid identified in Atropa belladonna. In pharmacopeias, percolation is standardized as an extraction method for A. belladonna leaves, along with liquid-liquid extraction as a cleanup procedure and titration as an analytical method for assaying the atropine in the leaves. In this study, a faster, solvent-saving, and more reliable method for quality control of A. belladonna samples was developed. Ultrasound-assisted extraction was proposed and optimized by fractional factorial design followed by Box-Behnken design. For modeling atropine content, the following optimal conditions were established: particle size, 180 µm; percentage methanol in water, 50%; volume of solvent, 15 ml; time of extraction, 60 min; and number of extractions, two. This led to a significant improvement in atropine extraction (P < 0.001). For cleanup, solid-phase extraction was used as an alternative to liquid-liquid extraction, giving similar results, with higher reproducibility. Finally, for the atropine assay, a UPLC method was validated as a substitute for the classic titration method. Taken together, the development of an ultrasound-assisted extraction-solid-phase extraction-UPLC approach allowed the determination of atropine content in A. belladonna leaves in a time- and solvent-saving manner, with high reliability.