Title
Pentacyclic triterpene methyl ethers in recent lacustrine sediments (Lagoa do Caçó, Brazil)
Date Issued
01 March 2005
Access level
open access
Resource Type
journal article
Author(s)
Research Institute Development
Research Institute Development
Abstract
The lipid extracts of sediments collected from the Quaternary filling of a tropical lacustrine series (Lagoa do Caçó, Brazil) were investigated using gas chromatography-mass spectrometry (GC-MS). Various pentacyclic triterpene 3-methyl ethers (PTMEs) were present in the neutral fraction. Comparison of retention times and mass spectra with available standards allowed us to confirm the presence of olean-12-en-3β-ol ME (β-amyrin ME), olean-18-en-3β-ol ME (miliacin), taraxer-14-en-3β- ol ME (crusgallin), fern-9(11)-en-3β-ol ME (arundoin) and arbor-9(11)-en-3β-ol ME (cylindrin). The following other compounds could also be tentatively identified from their GC-MS characteristics: urs-12-en-3β-ol ME, bauer-7-en-3β-ol ME and fern-8-en-3β-ol ME. Other compounds such as possible 3α isomers of the PTMEs as well as di- or tri-unsaturated counterparts might be PTME diagenetic derivatives. According to previous chemotaxonomic studies, all these compounds most probably originate from Gramineae that used to colonize the savanna of Northern Brazil at the time of deposition. © 2004 Elsevier Ltd. All rights reserved.
Start page
449
End page
461
Volume
36
Issue
3
Language
English
OCDE Knowledge area
Química orgánica
Geociencias, Multidisciplinar
Scopus EID
2-s2.0-13444311054
Source
Organic Geochemistry
ISSN of the container
01466380
Sponsor(s)
Professor R.M. Smith (Loughborough University, UK), Professor H.E. Connor (University of Canterbury, NZ) and Professor G. Eglinton (Bristol University, UK) are greatly acknowledged for providing reference compounds and valuable discussions about chemotaxonomy. The authors thank Professor G. Bouchoux (Ecole Polytechnique, France), Dr. P. Metzger (Ecole de Chimie de Paris, France) and Professor B. Simoneit (Oregon State University, US) for useful discussions on mass spectra interpretation. Dr. B. van Aarssen and two anonymous reviewers are also greatly acknowledged for improving the original version of this manuscript. The study has been supported by an IRD (France)-CNPq (Brazil) convention and a CNRS (France)-CNPq (Brazil) convention. One of us (J. Jacob) receives financial support from the Conseil Régional du Centre.
Sources of information:
Directorio de Producción Científica
Scopus