Composición química del aceite esencial de las hojas de Hedyosmum luteynii Todzia (Chloranthaceae)

El objetivo de este trabajo fue la caracterización química del aceite esencial de Hedyosmum luteynii, a partir de muestras recolectadas en el bosque natural Jacarón, cantón Colta, provincia de Chimborazo, Ecuador. El aceite esencial se extrajo por hidrodestilación; el análisis de la composicion se realizó mediante un cromatógrafo de gases acoplado a un espectrómetro de masas; la identificación de los componentes se realizó por comparación de sus espectros de masas y de los índices de Kováts reportados en la literatura. Se identificaron 28 compuestos, correspondientes al 98.62% del total de los constituyentes, siendo la mayoría monoterpenos hidrocarburos naturales (83.21%). Los constituyentes más abundantes fueron: α-felandreno (32.72%), α-pineno (13.20%), (Z)-β-ocimeno (10.99%), silvestreno (6.51%), biciclogermacreno (5.05%), 1.8-cineol (4.95%), (E)-β-ocimeno (3.88%) y germacreno D (3.20%). Es la primera vez que se reporta al silvestreno como un componente importante en el aceite esencial de una de las especies del genero Hedyosmum. Este resultado hace evidente una marcada diferencia en la composición química del aceite esencial de H. luteynii respecto a otras especies del género Hedyosmum.

In this work, essential oil of Hedyosmum luteynii is characterize from samples collected in the Jacarón natural forest, Colta, Chimborazo, Ecuador. The essential oil was extracted by hydrodistillation; analysis of the composition was carried out by gas chromatograph, coupled to a mass spectrometer; identification of the components was made by comparing their mass spectra and the Kováts indexes reported in the literature. Twenty-eight compounds were identified, 98.62% of the total components. Natural hydrocarbon monoterpenes were the highger (83.21%). The most abundant components were: α-phellandrene (32.72%), α-pinene (13.20%), (Z)-β-ocimene (10.99%), silvestrene (6.51%), bicyclogermacrene (5.05%), 1.8-cineol (4.95%), (E)-β-ocimene (3.88%) and germacrene D (3.20%). For first time, silvestrene is reported as an important component of essential oil in one of the species of the genus Hedyosmum. This result is a important difference in the chemical composition of the essential oil of H. luteynii respect to other species of Hedyosmum.

Studies on the chemical constituents of the ear of Schizonepeta Mulifida / 中国药学杂志

OBJECTIVE:To investigate the chemical constituents of the ear of Schizonepeta mulifida (L.)Briq. METHODS：Ingredients of the ear of this plant were separated by means of solvent extraction and chromatography on silica gel and polyamide and activated charcoal. RESULTS：Three components were isolated. Their structures were elucidated based on the spectral analysis. One of them is a known compound i.e. dehydrosylvestrene (V). The other two were new compound,named neoenneaanetetraoic acid (Ⅶ)，and 3-imino-N-nitrogen substituted acetamide cyclic buty amide (Ⅷ). CONCLUSION：These 3 compounds were isolated from the plant for the first time.By the way, a mixture of n-alkane was also obtained which contains seventeen n-alkane compounds proved by GC-MS.