Pentacyclic triterpene methyl ethers in recent lacustrine sediments (Lagoa do Caçó, Brazil).

Jérémy Jacob (1) , Jean-Robert Disnar (1) , Mohammed Boussafir (1) , Ana Luiza Spadano Albuquerque (2) , Abdelfettah Sifeddine (3) , Bruno Turcq (4)

1 ISTO - Institut des Sciences de la Terre d'Orléans
2 DEPARTAMENTO DE GEOQUIMICA - Departamento de Geoquimica Universidade Federal Fluminense
3 IRD/CNPQ - Departamento de Geoquimica, Universidade Federal Fluminense
4 PALEOTROPIQUE - Paléo-environnements tropicaux et variabilité climatique

The lipid extracts of sediments collected from the Quaternary filling of a tropical lacustrine series (Lagoa do Caçó, Brazil) were investigated by 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 certify 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 coud 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 3β 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 savannas of Northern Brazil at the time of deposition.

Domains: Geochemistry

Jérémy Jacob, Jean-Robert Disnar, Mohammed Boussafir, Ana Luiza Spadano Albuquerque, Abdelfettah Sifeddine, et al.. Pentacyclic triterpene methyl ethers in recent lacustrine sediments (Lagoa do Caçó, Brazil).. Organic Geochemistry, 2005, 36, pp.449-461. ⟨10.1016/j.orggeochem.2004.09.005⟩. ⟨hal-00022471⟩