期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 26, 页码 14688-14693出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1922445117
关键词
lipid; archaeology; mass spectrometry imaging; SIMS
资金
- Gerda-Henkel Foundation [AZ 27/V/18]
- University of Bristol's School of Arts and Faculty of Arts Research Funds
- Engineering and Physical Sciences Research Council [EP/P029868/1]
- EPSRC [EP/P029868/1] Funding Source: UKRI
Traces of lipids, absorbed and preserved for millennia within the inorganic matrix of ceramic vessels, act as molecular fossils and provide manifold information about past people's subsistence, di-et, and rituals. It is widely assumed that lipids become preserved after adsorption into nano-to micrometer-sized pores, but to this day the distribution of these lipids in the ceramics was virtu-ally unknown, which severely limits our understanding about the process of lipid preservation. Here we use secondary ion mass spectrometry (SIMS) imaging for direct in situ analysis of lipids absorbed in 700-to 2,000-y-old archaeological pottery. After sec-tioning from larger sherds, wall cross-sections of smaller frag-ments were used for SIMS analysis. Lipids were found in relatively large zones of 5-to 400-mu m diameter, which does not support the notion of absorption only into individual nanometer-scale pores but indicates that more macroscopic structures in the ceramics are involved in lipid preservation as well. Furthermore, lipids were found concentrated on calcium carbonate inclusions in the ceramics, which suggests that precipitation of fatty acids as calcium salts is an important aspect of lipid preservation in archae-ological samples. This has important implications for analytical methods based on extraction of lipids from archaeological ce-ramics and needs to be considered to maximize the yield and avail-able information from each unique sample.
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