RESUMEN

The antimicrobian activity of ethanol, acetone and aqueous extracts of the aereal parts of Ageratina neriifolia (Asteraceae) were evaluated againts Staphyiococcus aureus (ATCC 25923), Enterococcusfaecalis (ATCC 29212), Escherichia coli (ATCC 25992), Pseuclomortas aeruginosa (ATCC 27853) arid Candida albicarzs (ATCC 90028), using the disc diffusion method. Only the acetonic and ethanolic extracts showed activity against S. aureus, E.faecalzs, proving that the compounds present in A. nerlifolia are active againts Gram positive bacterias. This is the first time antimicrobian activity has been reported for this species.

RESUMEN

Dos  flaconas fueron aisladas del extracto alcohólico de Baccharis nítida (Ruiz et Pavon) Pers., usando ténicas cromatográficas. Estos compuestos fueron caracterizados por métodos espectroscópicos de UV, IR, RMN- H, RMN- C, HMQC y EM como 5,7 –dihidroxi-6,8,4 –trimetoxi-flavona (Nevadensina) y 5,4 –dihidroxi -6,7,8-trimetoxi-flavona (Xantomicro), aislados por primera vez de esta especie.