Alkenone Isolation
Alkenone Isolation - Related Videos
10:10
An Overview of Alkenone Biomarker Analysis for Paleothermometry
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2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst Throughout this series of videos, natural samples were extracted and purified in search of organic compounds, called biomarkers, that can relate information on climates and environments of the past. One of the samples analyzed was sediment. Sediments accumulate over geologic time in basins, depressions in the Earth into which sediment flows through the action of fluid (water or air), movement, and gravity. Two main types...
09:10
Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass
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Cited by 8 •
2016
Detailed methods are presented for the production of biodiesel along with the co-isolation of alkenones as valuable coproducts from commercial Isochrysis microalgae.
08:32
Surgical Perfusion and Isolation of the Porcine Pancreas for Islet Isolation
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Cited by 1 •
2024
This protocol provides a step-by-step guide for the procurement of a porcine pancreas for islet isolation and purification.
07:12
Neutrophil Isolation Protocol
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Cited by 176 •
2008
Neutrophils are among the first cells to arrive on the site of inflammatory immune response, and their functions and mechanisms have been studied extensively in vitro. We demonstrate a standard density gradient separation method to isolate human neutrophils from whole blood using commercially available separation media.
08:09
Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
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Cited by 1 •
2017
We describe the isolation of cardiac extracellular matrix from C57Bl/6J control mice, tight-skin mice, and tight-skin mice treated with the IRF5 inhibitory peptide. We also describe the vasodilation studies on the isolated vessels from C57Bl/6J, tight-skin mice and tight-skin mice treated with the IRF5 inhibitory peptide.
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The key signal is the distribution of alkenones with different degrees of unsaturation. Certain marine haptophyte algae alter that unsaturation in relation to their growth temperature, so the molecular pattern preserved in sediment can serve as evidence of past sea-surface conditions. Isolation is important because it separates these temperature-sensitive compounds from the broader sedimentary lipid mixture before measurement.
Organic-solvent extraction and chromatographic separation perform different jobs. Extraction transfers lipid compounds from the environmental sample into an organic phase, whereas chromatography separates the alkenones from other extracted lipids and concentrates them. This sequence improves the chemical specificity of the later gas-chromatographic measurement, allowing researchers to evaluate alkenone molecular distributions rather than an undifferentiated bulk lipid signal.
A bulk measurement combines many sedimentary lipids and cannot isolate the compounds associated with temperature-related algal production. Examining the distribution after isolation focuses analysis on the alkenone signal itself. This makes the resulting molecular evidence more suitable for comparing environmental conditions through time in sediments and for reconstructing changes in past sea-surface temperature.
The workflow begins with an environmental sample, commonly marine sediment, and an organic-solvent extraction of its lipid constituents. Chromatographic separation then isolates and concentrates the alkenones from the resulting mixture. Finally, gas chromatography measures their molecular distributions. Each stage narrows the chemical target, linking a complex sediment sample to interpretable alkenone data.
Alkenone isolation can support environmental monitoring and investigations of organic-matter preservation, not only reconstruction of past sea-surface temperatures. The compounds provide molecular-level information within sedimentary organic matter, while their measured distributions can be considered in studies of biogeochemical cycles. Thus, the same analytical workflow connects compound-level observations with broader environmental and sedimentary processes.
By separating alkenones from the wider sedimentary lipid mixture, researchers can examine these compounds as identifiable molecular components of preserved organic matter. Their recovery and subsequent distribution measurements provide a focused way to investigate how environmental organic signals are retained in sediments. This perspective complements paleoclimate reconstruction by placing alkenones within broader studies of sedimentary preservation and biogeochemical cycling.