Chemical composition and histochemistry of Sphagneticola trilobata essential oil

• Autor(a) principal: Silva, Cleber José da
• Data de Publicação: 2012
• Outros Autores: Barbosa, Luiz C. A., Demuner, Antonio J., Montanari, Ricardo M., Francino, Dayana, Meira, Renata M. S. A., Souza, Ana Olívia de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://dx.doi.org/10.1590/S0102-695X2012005000012; http://www.locus.ufv.br/handle/123456789/18397
• topic: Essential oils; Seasonal variation; Secretory structures; Sphagneticola trilobata

Anatomical and histochemical investigations of Sphagneticola trilobata (L.) Pruski, Asteraceae, secretory structures in leaves and stems and the seasonal variation of essential oils were carried out. Histochemical techniques enabled the specific location of the essential oil accumulation in the internal (canals) and external structures (trichomes). Histochemical analysis showed that the secretory trichomes produced steroids. The highest yield was obtained from plants collected in winter, when it was registered low temperature and precipitation. The essential oil was characterized by high percentage of hydrocarbon sesquiterpenes, hydrocarbon monoterpenes and low levels of oxygenated sesquiterpenes. The major components were germacrene D (11.9-35.8%), α-phellandrene (1.4-28.5%), α-pinene (7.3-23.8%), E-caryophyllene (4.6-19.0%), bicyclogermacrene (6.0-17.0%), limonene (1.8-15.1%) and α-humulene (4.0-11.6%). The percentage of most of the individual constituents present in S. trilobata essential oil changed significantly during the months.