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

Abstract

RESUMO: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. . 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 Bahia. Palavras

Chemical Characterization, Antibacterial and Antioxidant Activities of Essential Oils of <i>Mentha viridis</i> L. and <i>Mentha pulegium</i> L. (L)

“…The major constituents were pulegone (50.01%), menthol (31.9%) and menthone (16.56%). Oliveira et al [18] studied the essential oil from Metha pulegium collected in the spring and winter. They detected 6.62% borneol, 61.43% pulegone in the spring and 8.87% borneol and 28.40% pulegone in the winter.…”

Calamintha nepeta (L.) Savi and its Main Essential Oil Constituent Pulegone: Biological Activities and Chemistry

“…This evolution of oil composition with the vegetative state seems to follow the one reported for Mentha x piperita L. [ 219 ]. The influence of seasonality on the PUL content in the EO of Mentha pulegium L. with a 54% reduction in its concentration during the winter has been also demonstrated [ 220 ]. PUL is the precursor for the formation of the stereoisomers of menthone, and this transformation leads to the reduction in PUL content of EOs.…”

Seasonal effect in essential oil composition and antioxidant activity of Plectranthus amboinicus leaves

“…Efficiencies were calculated by the ratio between the weights of obtained oil and the fresh plant material. In studies conducted by Bandeira et al (2011), Oliveira et al (2011 and Rodrigues et al (2013) were obtained 0.19%, 0.43%, and 0.3%, respectively, using hydrodistillation as extraction method. According to Reis (2012) Concerning the composition of the essential oil (Table 2) , the Carvacrol is the major component in leaves of P. amboinicus during almost the entire year, especially April 2014, showing a level of 73.4%.…”