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  Identification of novel 7-methyl and cyclopentanyl branched glycerol dialkyl glycerol tetraethers in lake sediments

Ding, S., Schwab, V. F., Ueberschaar, N., Roth, V.-N., Lange, M., Xu, Y., et al. (2016). Identification of novel 7-methyl and cyclopentanyl branched glycerol dialkyl glycerol tetraethers in lake sediments. Organic Geochemistry, 102, 52-58. doi:10.1016/j.orggeochem.2016.09.009.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-002C-1C3B-5 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0009-31E4-E
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 Urheber:
Ding, Su, Autor
Schwab, Valérie F., Autor
Ueberschaar, Nico, Autor
Roth, Vanessa-Nina, Autor
Lange, Markus, Autor
Xu, Yunping, Autor
Gleixner, Gerd, Autor
Pohnert, Georg1, Autor           
Affiliations:
1Max Planck Fellow Group Chemical Ecology of Plankton, Prof. Georg Pohnert, MPI for Chemical Ecology, Max Planck Society, ou_2333692              

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 Zusammenfassung: Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial membrane lipids that are widely used as valuable paleoenvironmental proxies. The recently discovered 6-methyl brGDGTs improved the accuracy of the proxies for temperature “methylation branched tetraethers (MBT)” and soil pH “cyclization branched tetraethers (CBT)”. However, the calibration uncertainties are still substantial for brGDGT-derived proxies (e.g., 5 °C for MBT′5ME). Here we report a series of novel 7-methyl brGDGT isomers that co-eluted with the known 5- and 6-methyl brGDGTs in commonly applied normal phase high performance liquid chromatography (HPLC). Using an optimized HPLC gradient the novel 7-methyl brGDGTs could be structurally characterized and quantified. Their mean relative abundance was in the range of 6% of the total brGDGTs in Chinese and Cameroon lake sediments. The 7-methyl brGDGT IIa7 correlates with sediment pH (R2 = 0.44, root-mean-square error = 0.26 pH unit), a result that motivates the re-analysis of brGDGTs in soils and sediments to further reassess brGDGT-based proxies and to determine the source of 7-methyl brGDGTs. In addition to the 7-methyl brGDGTs, we identified two novel pentamethylated brGDGTs based on the mass spectra of its ether-cleaved hydrocarbon products.

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 Datum: 2016-09-242016-10-012016
 Publikationsstatus: Erschienen
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 Identifikatoren: Anderer: FGP004
DOI: 10.1016/j.orggeochem.2016.09.009
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Titel: Organic Geochemistry
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford : Pergamon
Seiten: - Band / Heft: 102 Artikelnummer: - Start- / Endseite: 52 - 58 Identifikator: ISSN: 0146-6380
CoNE: https://pure.mpg.de/cone/journals/resource/954925474428