Journal
MOLECULES
Volume 26, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/molecules26071830
Keywords
n-alkanes; compound-specific isotope analysis; hydrogen isotopes; palaeoclimate; archaeology; thermal alteration; combustion
Funding
- European Research Council (ERC) Consolidator Grant project PALEOCHAR [648871]
- European Research Council (ERC) [648871] Funding Source: European Research Council (ERC)
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This study conducted heating experiments on lipid biomarkers extracted from different tissues of Celtis australis plants, revealing isotopic variations during short-term low-temperature combustion. It emphasizes the cautious interpretation of δH-2(wax) values in archaeological or highly anthropogenic environments, and highlights the potential for palaeoclimate information analysis.
This paper reports on a series of heating experiments that focus on n-alkanes extracted from leaf, bark, and xylem tissues of the Celtis australis plant. These lipid biomarkers were analysed for their compound-specific hydrogen isotopic composition (delta H-2(wax)) under limited oxygen conditions at 150, 250, 350, and 450 degrees C. Our results reveal isotopic variations in wax lipids of different plant organs during short-term low-temperature combustion. We conclude that, in the absence of a detailed characterisation of the depositional environment in advance of sampling, delta H-2(wax) values in archaeological or otherwise highly anthropogenic environments should be interpreted cautiously. In addition, we observed that variation in delta H-2(wax) of leaves is minimal at temperatures <= 350 degrees C, highlighting the potential for delta H-2(wax) in thermally altered combustion substrates to yield palaeoclimate information, which could allow researchers to investigate links between archaeological and climatic records at a high spatial and temporal resolution.
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