Pressurized liquid extraction of selected molecular biomarkers in deep sea sediments used as proxies in paleoceanography

被引:22
作者
Calvo, E [1 ]
Pelejero, C
Logan, GA
机构
[1] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
[2] Geosci Australia, Petr & Marine Div, Canberra, ACT 2601, Australia
关键词
pressurized liquid extraction; molecular biomarkers; deep sea sediments; U-37(K ') index; alkenones;
D O I
10.1016/S0021-9673(03)00119-5
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Pressurized liquid extraction has been performed on a suite of deep-sea sediments to assess its capability as an extraction technique in the analysis of molecular biomarkers used in paleoceanography. Specific compounds assessed comprise long-chain alkenones, n-alkanes, n-alcohols and, additionally, one diol and one keto-ol. These have been extracted by both pressurized liquid extraction and ultrasonication for comparison. One key result is that the U-37(K') index (based on the degree of unsaturation of the alkenones and used as a paleothermometer in paleoceanography) remains intact after both extraction techniques. In terms of biomarker concentrations, which are often used to qualitatively assess changes in marine productivity and/or terrigenous inputs, pressurized liquid extraction is substantially more efficient than ultrasonication, providing higher amounts of extracted constituents, particularly for polar compounds. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:197 / 205
页数:9
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