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Article: An efficient method for isolating individual long-chain alkenones for compound-specific hydrogen isotope analysis

TitleAn efficient method for isolating individual long-chain alkenones for compound-specific hydrogen isotope analysis
Authors
Issue Date2007
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/ac
Citation
Analytical Chemistry, 2007, v. 79 n. 9, p. 3430-3435 How to Cite?
AbstractHydrogen isotope ratios ( 2H/H or D/H) of long-chain unsaturated ketones (alkenones) preserved in lake and marine sediments hold great promise for paleoclimate studies. However, compound-specific hydrogen isotope analysis of individual alkenones has not been possible due to chromatographic coelution of alkenones with the same carbon chain length but different numbers of double bonds. Published studies have only reported the δD values of the mixture of coeluting alkenones. We developed an efficient procedure to isolate individual alkenones based on double-bond numbers using silica gel impregnated with silver nitrate. The chromatographic procedure is simple, inexpensive, and highly reproducible, offers 87-100% sample recovery, and allows for the first time hydrogen isotopic measurement on individual alkenones. δ5D values of specific di-, tri- and tetraunsaturated C37 alkenones produced by an Emiliania huxleyi culture, as well as those isolated from Greenland lake sediments, differ consecutively by 43-65 ‰. These findings suggest that alkenones with different numbers of carbon-carbon double bonds express significantly different 6D values and that coelution of different alkenones may lead to erroneous source water δD reconstructions. Our alkenone isolation approach opens a new avenue for paleoclimate reconstructions using hydrogen isotope ratios of individual alkenones. © 2007 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/151205
ISSN
2015 Impact Factor: 5.886
2015 SCImago Journal Rankings: 2.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorD'andrea, WJen_US
dc.contributor.authorLiu, Zen_US
dc.contributor.authorAlexandre, MDRen_US
dc.contributor.authorWattley, Sen_US
dc.contributor.authorHerbert, TDen_US
dc.contributor.authorHuang, Yen_US
dc.date.accessioned2012-06-26T06:18:38Z-
dc.date.available2012-06-26T06:18:38Z-
dc.date.issued2007en_US
dc.identifier.citationAnalytical Chemistry, 2007, v. 79 n. 9, p. 3430-3435en_US
dc.identifier.issn0003-2700en_US
dc.identifier.urihttp://hdl.handle.net/10722/151205-
dc.description.abstractHydrogen isotope ratios ( 2H/H or D/H) of long-chain unsaturated ketones (alkenones) preserved in lake and marine sediments hold great promise for paleoclimate studies. However, compound-specific hydrogen isotope analysis of individual alkenones has not been possible due to chromatographic coelution of alkenones with the same carbon chain length but different numbers of double bonds. Published studies have only reported the δD values of the mixture of coeluting alkenones. We developed an efficient procedure to isolate individual alkenones based on double-bond numbers using silica gel impregnated with silver nitrate. The chromatographic procedure is simple, inexpensive, and highly reproducible, offers 87-100% sample recovery, and allows for the first time hydrogen isotopic measurement on individual alkenones. δ5D values of specific di-, tri- and tetraunsaturated C37 alkenones produced by an Emiliania huxleyi culture, as well as those isolated from Greenland lake sediments, differ consecutively by 43-65 ‰. These findings suggest that alkenones with different numbers of carbon-carbon double bonds express significantly different 6D values and that coelution of different alkenones may lead to erroneous source water δD reconstructions. Our alkenone isolation approach opens a new avenue for paleoclimate reconstructions using hydrogen isotope ratios of individual alkenones. © 2007 American Chemical Society.en_US
dc.languageengen_US
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/acen_US
dc.relation.ispartofAnalytical Chemistryen_US
dc.titleAn efficient method for isolating individual long-chain alkenones for compound-specific hydrogen isotope analysisen_US
dc.typeArticleen_US
dc.identifier.emailLiu, Z:zhliu@hku.hken_US
dc.identifier.authorityLiu, Z=rp00750en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1021/ac062067wen_US
dc.identifier.scopuseid_2-s2.0-34248147642en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34248147642&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume79en_US
dc.identifier.issue9en_US
dc.identifier.spage3430en_US
dc.identifier.epage3435en_US
dc.identifier.isiWOS:000246027100019-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridD'Andrea, WJ=8722939400en_US
dc.identifier.scopusauthoridLiu, Z=16177844800en_US
dc.identifier.scopusauthoridAlexandre, MDR=7005182454en_US
dc.identifier.scopusauthoridWattley, S=16305833100en_US
dc.identifier.scopusauthoridHerbert, TD=7005866440en_US
dc.identifier.scopusauthoridHuang, Y=7501574588en_US

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