SciELO - Scientific Electronic Library Online

 
vol.53 issue1CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)SYNTHESIS AND DETERMINATION OF THE PROPERTIES OF THE BIFUNCTIONAL BETA ZEOLITE CATALYSTS FOR N-HEPTANE HYDROISOMERIZATION author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

URZUA, ALEJANDRO  and  MENDOZA, LEONORA. EPICUTICULAR COMPONENTS FROM PSEUDOGNAPHALIUM ROBUSTUM (ASTERACEAE): CHEMOSYSTEMATIC CONSIDERATIONS. J. Chil. Chem. Soc. [online]. 2008, vol.53, n.1, pp.1411-1412. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072008000100018.

Surface compounds were obtained by a methylene chloride extraction of fresh aerial parts of Pseudognaphalium robustum. The methylene chloride extract was fractionated by CC and the fractions were analyzed by GC-MS. Since flavonoids and terpenes are present only in small amounts in the epicuticular exúdate of P. robustum, 80% of the surface compounds actually correspond to a complex mixture of saturated fatty acid esters, unsaturated fatty acid esters, alcohols, aldehydes, fatty acids, alkenes, triglycerides and monoglycerides. A minor hydrocarbon fraction of n-alkanes from C23 to C37 was also identified. On the contrary, in P. vira vira, P. cheiranthifolium, and P. heterotrichium, the epicuticular extracts contain from 70% to 80% of a mixture of diterpenoids and n-alkanes. These results show a remarkable distance between P. robustum and other species of the genus, which share the same ecosystem, when the whole pool of epicuticular compounds is taken into account. Also, these considerable differences in chemical composition are in agreement with authors that consider Pseudognaphalium as a heterogeneous taxonomic group

Keywords : Pseudognaphalium robustum; Asteraceae; Methylene chloride extract; Epicuticular components; GC-MS; Saturated fatty acid esters; Unsaturated fatty acid esters; Epicuticular triglycerides; monoglycerides; Chemosystematic.

        · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License