Publications des scientifiques de l'IRD

Jacob J., Disnar J.R., Boussafir M., Albuquerque A.L.S., Sifeddine Abdelfettah, Turcq Bruno. (2005). Pentacyclic triterpene methyl ethers in recent lacustrine sediments (Lagoa do Caco, Brazil). Organic Geochemistry, 36 (3), p. 449-461. ISSN 0146-6380.

Titre du document
Pentacyclic triterpene methyl ethers in recent lacustrine sediments (Lagoa do Caco, Brazil)
Année de publication
2005
Type de document
Article référencé dans le Web of Science WOS:000227518300009
Auteurs
Jacob J., Disnar J.R., Boussafir M., Albuquerque A.L.S., Sifeddine Abdelfettah, Turcq Bruno
Source
Organic Geochemistry, 2005, 36 (3), p. 449-461 ISSN 0146-6380
The lipid extracts of sediments collected from the Quaternary filling of a tropical lacustrine series (Lagoa do Caco, 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-3beta-ol ME (beta-amyrin ME), olean-18-en-3beta-ol ME (miliacin), taraxer- 14-en-3beta-ol ME (crusgallin), fern-9(l I)-en-3beta-ol ME (arundoin) and arbor-9(11)-en-3beta-ol ME (cylindrin). The following other compounds could also be tentatively identified from their GC-MS characteristics: urs-12-en-3beta-ol ME, bauer-7-en-3beta-ol ME and fern-8-en-3beta-ol ME. Other compounds such as possible 3alpha 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. (C) 2004 Elsevier Ltd. All rights reserved.
Plan de classement
Géologie et formations superficielles [064]
Localisation
Fonds IRD [F B010042255]
Identifiant IRD
fdi:010042255
Contact