The essential oil of the aerial parts of Baccharis notosergila was examined by GC and GC-MS. Thirty-one constituents were identified representing 96.4% and alpha-pinene, limonene, beta-caryophyllene, and spathulenol were found to be the major components. Furthermore, the oil was tested against eight gram-positive and -negative bacteria and it was found that they exhibited moderate antibacterial activity.
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