RESUMO
Alternanthera brasiliana is popularly known as 'penicillin' and used as an anti-inflammatory and for wound healing. The objective of this work was the phytochemical study of the species by analytical techniques such as LC-MS/MS and GC-MS. Twenty-seven compounds were identified, five by LC-MS and 22 by GC-MS analysis. All compounds identified by LC-MS are flavonoids. However, several classes were found in GC-MS analysis, such as hydrocarbons, diterpenes, monoterpenes, vitamin and carotenoid derivatives, phytosterols and triterpenes. In the analysis, it is suggested the presence of 27 substances, of which 23 are unpublished for the species, that reaffirms the importance of this study and the contribution to chemical knowledge.
Assuntos
Amaranthaceae/química , Compostos Fitoquímicos/análise , Anti-Inflamatórios , Carotenoides/análise , Cromatografia Líquida/métodos , Flavonoides/análise , Cromatografia Gasosa-Espectrometria de Massas/métodos , Compostos Fitoquímicos/isolamento & purificação , Fitosteróis/análise , Extratos Vegetais/química , Espectrometria de Massas em Tandem/métodos , Terpenos/análise , CicatrizaçãoRESUMO
The monoterpenes are the main constituents of most essential oils and p-cymene is a monoterpene commonly found in various species of aromatic herbs, which has been reported for anti-inflammatory, antinociceptive, and antimicrobial activities. However, there is no report concerning its pharmacological activity on the vascular smooth muscle. The aim of current work was to investigate the effects of p-cymene in isolated rat aorta and also study its mechanism of action. In this work, we show that p-cymene has a relaxant effect, in a dose-dependent way, on the vascular smooth muscle, regardless of the presence of the endothelium. Using a nonselective potassium channel blocker, the CsCl, the relaxant effect of p-cymene was attenuated. In the presence of more selective potassium channels blockers, such as TEA or 4-AP, no change in the relaxant effect of p-cymene was evidenced, indicating that BKCa and KV channels are not involved in that relaxant effect. However, in the presence of glibenclamide or BaCl2, KATP and Kir blockers, respectively, the relaxant effect of p-cymene was attenuated. The data presented indicate that p-cymene has a relaxing effect on rat aorta, regardless of the endothelium, but with the participation of the KATP and Kir channels.