Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments.
Long chain alkenones and photosynthetic pigment derivatives (chlorins) are commonly employed biomarkers in the reconstruction of past sea surface temperatures (SSTs) and organic carbon export from the surface to the deep ocean. For these studies, marine sediment samples are often available which hav...
Published in: | Organic Geochemistry |
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Online Access: | http://dro.dur.ac.uk/8955/ https://doi.org/10.1016/j.orggeochem.2007.01.006 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:8955 2023-05-15T17:33:52+02:00 Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. McClymont, E.L. Martinez-Garcia, A. Rosell-Melé, A. 2007-06-01 http://dro.dur.ac.uk/8955/ https://doi.org/10.1016/j.orggeochem.2007.01.006 unknown Elsevier dro:8955 issn:0146-6380 doi:10.1016/j.orggeochem.2007.01.006 http://dro.dur.ac.uk/8955/ http://dx.doi.org/10.1016/j.orggeochem.2007.01.006 Organic geochemistry, 2007, Vol.38(6), pp.1002-1007 [Peer Reviewed Journal] Article PeerReviewed 2007 ftunivdurham https://doi.org/10.1016/j.orggeochem.2007.01.006 2020-05-28T22:28:46Z Long chain alkenones and photosynthetic pigment derivatives (chlorins) are commonly employed biomarkers in the reconstruction of past sea surface temperatures (SSTs) and organic carbon export from the surface to the deep ocean. For these studies, marine sediment samples are often available which have been air dried or freeze-dried, given that these are common methods for removing water from sediments prior to microfossil analysis. We compared both drying procedures by analysing samples from two sediment cores (ODP 1087, southeast Atlantic and M36/2-MC435, North Atlantic). We found that significant losses of chlorins (>25%) and alkenones (up to 75%) occur with air-drying relative to freeze-drying. Changes in the composition of pigments are also likely. The alkenone unsaturation index View the MathML source is sensitive to the drying method, showing an increase of up to 0.02 units relative to freeze-drying. However, this represents a maximum increase in SST estimates of only 0.5 °C. The tests suggest that freeze dried samples, rather than air dried sediments, should preferably be used to determine the sedimentary concentration of biomarkers. However, if chlorins are the main target compounds, wet extraction with acetone of sediment results in ca. 12% higher yield than the extraction of freeze-dried sediments with acetone/water. Article in Journal/Newspaper North Atlantic Durham University: Durham Research Online Organic Geochemistry 38 6 1002 1007 |
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Durham University: Durham Research Online |
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ftunivdurham |
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description |
Long chain alkenones and photosynthetic pigment derivatives (chlorins) are commonly employed biomarkers in the reconstruction of past sea surface temperatures (SSTs) and organic carbon export from the surface to the deep ocean. For these studies, marine sediment samples are often available which have been air dried or freeze-dried, given that these are common methods for removing water from sediments prior to microfossil analysis. We compared both drying procedures by analysing samples from two sediment cores (ODP 1087, southeast Atlantic and M36/2-MC435, North Atlantic). We found that significant losses of chlorins (>25%) and alkenones (up to 75%) occur with air-drying relative to freeze-drying. Changes in the composition of pigments are also likely. The alkenone unsaturation index View the MathML source is sensitive to the drying method, showing an increase of up to 0.02 units relative to freeze-drying. However, this represents a maximum increase in SST estimates of only 0.5 °C. The tests suggest that freeze dried samples, rather than air dried sediments, should preferably be used to determine the sedimentary concentration of biomarkers. However, if chlorins are the main target compounds, wet extraction with acetone of sediment results in ca. 12% higher yield than the extraction of freeze-dried sediments with acetone/water. |
format |
Article in Journal/Newspaper |
author |
McClymont, E.L. Martinez-Garcia, A. Rosell-Melé, A. |
spellingShingle |
McClymont, E.L. Martinez-Garcia, A. Rosell-Melé, A. Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. |
author_facet |
McClymont, E.L. Martinez-Garcia, A. Rosell-Melé, A. |
author_sort |
McClymont, E.L. |
title |
Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. |
title_short |
Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. |
title_full |
Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. |
title_fullStr |
Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. |
title_full_unstemmed |
Benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. |
title_sort |
benefits of freeze-drying sediments for the analysis of total chlorins and alkenone concentrations in marine sediments. |
publisher |
Elsevier |
publishDate |
2007 |
url |
http://dro.dur.ac.uk/8955/ https://doi.org/10.1016/j.orggeochem.2007.01.006 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Organic geochemistry, 2007, Vol.38(6), pp.1002-1007 [Peer Reviewed Journal] |
op_relation |
dro:8955 issn:0146-6380 doi:10.1016/j.orggeochem.2007.01.006 http://dro.dur.ac.uk/8955/ http://dx.doi.org/10.1016/j.orggeochem.2007.01.006 |
op_doi |
https://doi.org/10.1016/j.orggeochem.2007.01.006 |
container_title |
Organic Geochemistry |
container_volume |
38 |
container_issue |
6 |
container_start_page |
1002 |
op_container_end_page |
1007 |
_version_ |
1766132506503938048 |