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Nesse trabalho foi investigado a composição química de óleos essenciais de duas plantas medicinais cultivadas em Ilhéus, Brasil, Plectranthus amboinicus (Lour.) Spreng. (hortelã-grosso) e Mentha pulegium L. (poejo). Os óleos essenciais foram extraídos das folhas frescas por hidrodestilação e foram analisados por CG/FID e CG-EM, na primavera e no inverno. P. amboinicus forneceu, tanto na primavera como no inverno, 0,10% de óleo sendo timol o componente majoritário. M. pulegium forneceu na primavera 0,20% de óleo e no inverno 0,09%. Os componentes majoritários dos óleos foram pulegona e trans-cariofileno; borneol, mentol e piperitona foram identificados em menores quantidades. No inverno foram observados maiores quantidades de mentol e isomentol. Acetatos de neoisomentila, de mentila e de isometila foram observados somente no inverno. Esse trabalho contribui para o conhecimento das espécies vegetais cultivadas na região do sul da Bahia This work investigated the chemical composition of the essential oils of two medicinal plants grown in Ilhéus Municipality, Bahia State, Brazil: Plectranthus amboinicus (Lour.) Spreng (Mexican mint) and Mentha pulegium L. (pennyroyal). The essential oils were extracted from fresh leaves by hydrodistillation and analyzed by GC-FID and GC-MS, in the spring and in the winter. In both seasons, P. amboinicus yielded 0.10% oil and had thymol as major component. M. pulegium yielded 0.20% and 0.09% oil in the spring and winter, respectively. The major components were pulegone and trans-caryophyllene, whereas borneol, menthol and piperitone were identified at small quantities. Higher menthol and isomenthol levels were detected in the winter. In addition, neoisomenthyl, menthyl and isomenthyl acetates were only observed in the winter. This work contributes to the knowledge of plant species grown in southern Bahi

Constituintes voláteis de Mentha pulegium L. e Plectranthus amboinicus (Lour.) Spreng