RESUMEN
The hydroethanol extract of the roots of Petiveria alliacea L. (Phytolaccaceae) has been investigated previously as an antitumor agent against mouse Ehrlich ascites. The extract and its methanol, butanol and ether fractions exhibited an antimitotic effect on sea urchin egg development. The aqueous fraction did not produce inhibition of cell cleavage. At the first cleavage the inhibition, at the lowest concentration (10 micrograms/ml), produced by the ether fraction was 42 per cent , whereas the inhibition produced by the total extract and by the other fractions was only 5 to 10 per cent showing that the ether fraction was the most active. Even at higher concentrations the butanol and methanol fractions inhibit the cleavage about 30 per cent . At the first cleavage, the ED50 of the hydroethanol extract and of the ether fraction were 45.02 and 12.40 micrograms/ml, respectively. Furthermore, in the second cleavage, the hydroethanol extract was about twice as potent as the methanol or butanol fractions (ED50 of 22.40, 44.80 and 54.10 micrograms/ml, respectively)
Asunto(s)
Animales , Mitosis/efectos de los fármacos , Óvulo/efectos de los fármacos , Extractos Vegetales/farmacología , División Celular , Óvulo/crecimiento & desarrollo , Erizos de MarRESUMEN
The antibacterial and antifungic activities of two kaurenic acids, ent kaurenoic acid and cinnamoylgrandifloric acid isolated from a hexane extract of aerial parts of Mikania laevigata, were investigated and compared with the activities of other kaurenic acid-derivatives substituted on carbon-15. Only acetylgrandifloric acid (en-kaur-16-en-15 alfa-acetyloxy-19-oic) and its epimer xylopic acid (ent-kaur-16-4n-15 beta-acetyloxy-19-oic) displayed significant antibacterial activity at concentrations >=250 microng/ml., the 15 alfa epimer being the most active
Asunto(s)
Bacterias/efectos de los fármacos , Diterpenos/farmacología , Hongos/efectos de los fármacos , Bacillus cereus/efectos de los fármacos , Brasil , Química , Extractos Vegetales/farmacología , Plantas Medicinales , Staphylococcus aureus/efectos de los fármacos , Staphylococcus epidermidis/efectos de los fármacosRESUMEN
The antibiotic activity of 16 diterpenes and of 2 phenanthrehene derivatives of diterpene origin, isolated from Brazilian plants was investigated against bacteria, yeasts, dermatophytes and aflatoxin-producing fung. Eight of the compounds were completely inactive. None showed inhibitory activity against the Gram-negative bacteria assaywed or aginst the Aspergillus species. The phenanthrene derivatives, chemically very simular to phytoalexins isolated from orchids, were especially active