Neste trabalho foram comparados perfis cromatográficos dos óleos provenientes de hidrodestilação de folhas de Baccharis punctulata, Baccharis dracunculifolia e Eupatorium laevigatum e os perfis cromatográficos obtidos utilizando-se HS-SPME. Várias plantas nativas do Brasil ainda não foram estudadas quanto à sua composição química. Técnicas convencionais de extração como a hidrodestilção, podem resultar em alterações da composição química original destes óleos. O uso da HS-SPME provê uma alternativa mais branda de extração, prevenindo transformações químicas e resultando em informações complementares sobre a composição de voláteis das plantas. Pela primeira vez, cumarina e cumaran foram identificados no "headspace" de folhas de E. laevigatum, após dano mecânico, por HS-SPME. As semelhanças e diferenças na composição dos voláteis, verificadas através de ambas as técnicas de extração, são discutidas, mostrando a complementaridade destas técnicas, as possíveis implicações destes resultados no que diz respeito a compostos infoquímicos e as possíveis transformações químicas durante o processo de hidrodestilação.In this work the qualitative chromatographic profiles of the volatile oil obtained with fresh chopped leaves of Baccharis punctulata, Baccharis dracunculifolia and Eupatorium laevigatum, using HS-SPME were compared with their hydrodistilled oils. Several Brazilian native plant species have not yet been studied regarding their volatile compounds composition. Conventional techniques employed for the investigation of volatile compounds, such as hydrodistillation, may impart chemical changes to the original oil composition. The use of HS-SPME provides alternative milder extraction conditions, preventing chemical transformations and supplying complementary information about volatiles composition. Coumarin and coumaran were detected by the first time among volatile components of E. laevigatum leaves after mechanical damage, only when using HS-SPME. Differences and similarities perceived between volatile compounds profiles using both extraction techniques are discussed, showing that they are complementary and may bring insight about fresh leaf volatiles playing infochemical roles and about chemical transformations caused by hydrodistillation.
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