title: Pressurized liquid extraction of selected molecular biomarkers in deep sea sediments used as proxies in paleoceanography.
abstract: 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 U37(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.
authors.affiliation: Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia. eva.calvo@anu.edu.au
authors.forename: Eva
authors.initials: E
authors.lastname: Calvo
authors.forename: Carles
authors.initials: C
authors.lastname: Pelejero
authors.forename: Graham A
authors.initials: GA
authors.lastname: Logan
mesh_terms: D015415:Biomarkers; D019015:Geologic Sediments / Q000737:chemistry*; D009791:Oceanography; D010163:Paleontology; D011312:Pressure
chemical_list: D015415:Biomarkers