Publications des scientifiques de l'IRD

Coffinet S., Huguet A., Williamson David, Bergonzini L., Anquetil C., Majule A., Derenne S. (2015). Occurrence and distribution of glycerol dialkanol diethers and glycerol dialkyl glycerol tetraethers in a peat core from SW Tanzania. Organic Geochemistry, 83-84, p. 170-177. ISSN 0146-6380.

Titre du document
Occurrence and distribution of glycerol dialkanol diethers and glycerol dialkyl glycerol tetraethers in a peat core from SW Tanzania
Année de publication
2015
Type de document
Article référencé dans le Web of Science WOS:000354555600016
Auteurs
Coffinet S., Huguet A., Williamson David, Bergonzini L., Anquetil C., Majule A., Derenne S.
Source
Organic Geochemistry, 2015, 83-84, p. 170-177 ISSN 0146-6380
Isoprenoid and branched glycerol dialkanol diethers (iso GDDs and br GDDs) have recently been detected in various environments, including sediment, soil and peat deposits. Their structures strongly resemble those of glycerol dialkyl glycerol tetraethers (GDGTs). Nevertheless, the origin of GDDs and their link to GDGTs remain unclear. Here we examined the concentration and distribution of iso GDDs and br GDDs, together with those of iso GDGTs and br GDGTs along a 4 m peat core from Tanzania. Whereas br GDDs have only been detected to date in their core lipid (CL) form, we report here, for the first time, br GDDs in both CL and intact polar lipid (IPL) forms, suggesting a biosynthetic origin for br GDDs. Concentrations of br GDGTs and br GDDs on one hand and of iso GDGTs and iso GDDs on the other hand, were observed to significantly co-vary (R-2 0.49-0.58; p < 0.05), both for the CL and IPL fractions. Moreover, the fractional abundance of each GDD correlated significantly with that of its GDGT analogue (R-2 0.33-0.97; p < 0.05). Taken together, the data show that GDDs and GDGTs are closely related and likely take part in common metabolic pathways, although the hypothesis of GDDs being degradation products of GDGTs cannot be excluded.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Pédologie [068]
Description Géographique
TANZANIE
Localisation
Fonds IRD [F B010064218]
Identifiant IRD
fdi:010064218
Contact