Composição Química e Atividade Antioxidante de Óleos Essenciais das Folhas da Schinus terebinthifolius e Siparuna guianensis

Resumo

The present work aimed to evaluate the chemical composition of the essential oils of two species found in the Cerrado of Tocantins State, Brazil. The essential oil of Schinus terebinthifolius (aroeira) and Siparuna guianensis (negramina) were obtained from the leaves by hydrodistillation, using Clevenger apparatus, with a yield of 0.16% and 0.20% respectively. Sixteen constituents were identified by gas-chromatography coupled to mass spectrometry (GC-MS) in the essential oil from S. terebinthifolius and twenty constituents in the essential oil from S. guianensis, the most of them being monoterpenes in both essential oils. The main volatile constituent of S. terebinthifolius essential oil was identified as D-limonene with 12.09%, while for S. guianensis species β-myrcene with 79.47% was identified as the major constituent. The antioxidant activity was determined using the DPPH method in thin layer chromatography and both essential oils were active. However, the allelopathic activity, using lettuce seeds, was not evidenced for both essential oils.