(Table 1) Ratio of hydroxy-GDGT vs. the total core GDGT was calculated based on the detection of hydroxy-GDGT, supplement to: Liu, Xiao-Lei; Lipp, Julius S; Simpson, Jeffrey H; Lin, Yu-Shih; Summons, Roger E; Hinrichs, Kai-Uwe (2012): Mono- and dihydroxyl glycerol dibiphytanyl glycerol tetraethers in marine sediments: Identification of both core and intact polar lipid forms. Geochimica et Cosmochimica Acta, 89, 102-115


Hydroxylated glycerol dialkyl glycerol tetraethers (hydroxy-GDGTs) were detected in marine sediments of diverse depositional regimes and ages. Mass spectrometric evidence, complemented by information gleaned from two-dimensional (2D) 1H–13C nuclear magnetic resonance (NMR) spectroscopy on minute quantities of target analyte isolated from marine sediment, allowed us to identify one major compound as a monohydroxy-GDGT with acyclic biphytanyl moieties (OH-GDGT-0). NMR spectroscopic and mass spectrometric data indicate the presence of a tertiary hydroxyl group suggesting the compounds are the tetraether analogues of the widespread hydroxylated archaeol derivatives that have received great attention in geochemical studies of the last two decades. Three other related compounds were assigned as acyclic dihydroxy-GDGT (2OH-GDGT-0) and monohydroxy-GDGT with one (OH-GDGT-1) and two cyclopentane rings (OH-GDGT-2). Based on the identification of hydroxy-GDGT core lipids, a group of previously reported unknown intact polar lipids (IPLs), including the ubiquitously distributed H341-GDGT (Lipp J. S. and Hinrichs K. -U. (2009) Structural diversity and fate of intact polar lipids in marine sediments. Geochim. Cosmochim. Acta 73, 6816–6833), and its analogues were tentatively identified as glycosidic hydroxy-GDGTs. In addition to marine sediments, we also detected hydroxy-GDGTs in a culture of Methanothermococcus thermolithotrophicus. Given the previous finding of the putative polar precursor H341-GDGT in the planktonic marine crenarchaeon Nitrosopumilus maritimus, these compounds are synthesized by representatives of both cren- and euryarchaeota. The ubiquitous distribution and apparent substantial abundance of hydroxy-GDGT core lipids in marine sediments (up to 8% of total isoprenoid core GDGTs) point to their potential as proxies.

DOI https://doi.org/10.1594/PANGAEA.786445
Related Identifier https://doi.org/10.1016/j.gca.2012.04.053
Related Identifier https://doi.org/10.1016/j.orggeochem.2011.02.003
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.786445
Creator Liu, Xiao-Lei; Lipp, Julius S; Simpson, Jeffrey H; Lin, Yu-Shih; Summons, Roger E; Hinrichs, Kai-Uwe
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2012
Funding Reference Seventh Framework Programme
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 59 data points
Discipline Earth System Research
Spatial Coverage (-126.865W, -25.345S, 32.701E, 48.698N); Eastern Basin; South Pacific Ocean; North Pacific Ocean
Temporal Coverage Begin 1995-03-28T13:12:00Z
Temporal Coverage End 2008-04-27T10:32:00Z