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

Ding, S., Schwab, B., 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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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002C-1BDE-E Version Permalink: https://hdl.handle.net/21.11116/0000-000A-4192-7
Genre: Journal Article

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 Creators:
Ding, Su1, 2, Author           
Schwab, Burkhard, Author
Ueberschaar, Nico, Author
Roth, Vanessa-Nina1, Author           
Lange, Markus1, Author           
Xu, Yunping, Author
Gleixner, Gerd1, Author           
Pohnert, Georg, Author
Affiliations:
1Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497775              
2IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry, Max Planck Society, Hans-Knöll-Str. 10, 07745 Jena, DE, ou_1497757              

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 Abstract: 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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 Dates: 2016-09-242016-10-012016
 Publication Status: Issued
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 Identifiers: Other: BGC2562
DOI: 10.1016/j.orggeochem.2016.09.009
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Title: Organic Geochemistry
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 102 Sequence Number: - Start / End Page: 52 - 58 Identifier: ISSN: 0146-6380
CoNE: https://pure.mpg.de/cone/journals/resource/954925474428