O fracionamento do extrato acetato de etila de frutos de Punica granatum, guiado por ensaios antimicrobianos frente a colônias de Staphylococcus aureus resistentes à meticilina, conduziu ao isolamento e à determinação estrutural do tanino elágico punicalagina. A identificação da substância foi realizada por CLAE/UV e RMN de ¹H. Os ensaios antimicrobianos foram realizados pelo método de difusão em discos de papel. A concentração mínima inibitória das substâncias foi determinada pelo método de diluição em agar padronizada pelo NCCLS (National Committee for Clinical Laboratory Standards).

The arthropod-borne Mayaro virus (MAYV) causes ‘Mayaro fever’, a disease of medical significance, primarily affecting individuals in permanent contact with forested areas in tropical South America. Recently, MAYV has attracted attention due to its likely urbanization. Currently, there are no licensed drugs against most mosquito-transmitted viruses. Here, we investigated the in vitro anti-MAYV activity of the flavonoids quercetin and its derivatives from the Brazilian shrub Bauhinia longifolia (Bong.) Steud.

The bioassay-guided fractionation of the hexane extract obtained from the medicinal plant Myroxylon balsamum (red oil) was conducted in preparative thin layer chromatography on silica gel. The obtained fractions and some terpenoids and phenylpropanoids were assayed as larvicidal on third instar Aedes aegypti larvae, NPPN colony. The results indicate that the sesquiterpene nerolidol was the active constituent in the extract and that the sesquiterpenes were more active than the monoterpenes and phenylpropanoids utilized in this study. Lipophilicity seems to be an important property for the activity since the compounds with hydroxyl, carbonyl and methoxyl groups were less active. The results confirm also that essential oils can be a good tool for the control of dengue