The essential oil obtained by hydrodistillation from the fresh resin of Protium heptaphyllum was analyzed by GC/MS. The main constituents were: α-pinene (10.5%), α-phellandrene (16.7%), limonene (16.9%), and terpinolene (28.5%). The essential oil was tested in vitro for antimicrobial and antioxidant activities. The results showed a moderate antimicrobial, but significant antioxidant activity. These results suggested that this essential oil is beneficial to human health, having the potential to be used for medical purposes and to be utilized as anti-bacterial additives to skin cosmetics.

The essential oil from the aerial parts of Baccharis trinervis (Lam.) Pers., obtained by hydrodistillation, was analyzed by GC-MS, as well as by 1 H and 13 C NMR. α-Thujene, α-pinene, sabinene, β-pinene, β-phellandrene, (E)-lachnophyllum acid methylester and (Z)-lachnophyllum acid methyl ester were found to be the major components among the identified constituents. Evaluation of the in vitro antimicrobial activity of the essential oil against four bacteria and one fungus is also reported.