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

被引：49
作者：
Ding, Su [1 ]
Schwab, Valerie F. [2 ]
Ueberschaar, Nico [2 ]
Roth, Vanessa-Nina [1 ]
Lange, Markus [1 ]
Xu, Yunping [3 ,4 ]
Gleixner, Gerd [1 ]
Pohnert, Georg [2 ,5 ]
机构：
[1] Max Planck Inst Biogeochem, Hans Knoll Str 10, D-07745 Jena, Germany
[2] Friedrich Schiller Univ, Dept Chem & Earth Sci, Inst Inorgan & Analyt Chem, Bioorgan Analyt, Lessingstr 8, D-07743 Jena, Germany
[3] Peking Univ, Coll Urban & Environm Sci, MOE Key Lab Earth Surface Proc, Beijing 100871, Peoples R China
[4] Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China
[5] Max Planck Inst Chem Ecol, Hans Knoll Str 8, D-07745 Jena, Germany
来源：
ORGANIC GEOCHEMISTRY | 2016年 / 102卷
基金：
美国国家科学基金会;
关键词：
7-Methyl brGDGTs; Biomarker; Lake sediments; Membrane lipids; Liquid chromatography-mass spectrometry; GDGT-BASED PROXIES; MEMBRANE-LIPIDS; ETHER LIPIDS; SOILS; BACTERIAL; ARCHAEAL; RIVER; GEOCHEMISTRY; CALIBRATION; CATCHMENT;
D O I：
10.1016/j.orggeochem.2016.09.009
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
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 degrees C for MBT5ME'). 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 IIa(7) correlates with sediment pH (R-2 = 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. (C) 2016 Published by Elsevier Ltd.
引用
收藏
页码：52 / 58
页数：7
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