Chemical and biological investigation of Eucalyptus cloeziana, E. citriodora, E. saligna, E. grandis and E. microcorys essential oils were evaluated. The essential oils analysis were performed by GC/MS and the antibacterial activity was assayed in vitro by using the agar diffusion method against Escherichia coli O:158, E. coli ATCC 8739, Staphylococcus aureus ATCC 6538 and Salmonella choleraeseus ATCC 10708. The essential oils of E. citriodora and E. grandis showed a major inhibitory activity against Gran negative bacteria.Keywords: Eucalyptus species; essential oils; antibacterial activity. INTRODUÇÃOEm diversas partes do mundo, várias espécies de Eucalyptus vêm sendo cultivados e explorados em grande escala há muitos anos. No Brasil, ele é encontrado em todas as regiões, sendo conhecidas cerca de 400 espécies, das quais são utilizadas desde o caule, de onde se extrai a celulose para a indústria do papel, até as folhas, de onde são retirados os óleos essenciais de diferentes composições químicas.Revista Brasileira de Farmacognosia, V. 11, n. 2, p. 95-100, 2001.
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