Long-chain unsaturated ketones in recent lacustrine sediments

Cranwell, P.A.

doi:10.1016/0016-7037(85)90259-5

Cited by 121 publications

(78 citation statements)

References 17 publications

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“…This distribution was characterized by the predominance of the C 37 homolog group maximized at the triunsaturated alkenone and by having the tetraunsaturated alkenone as second C 37 compound. Similar distributions have been found in a hypersaline lake from the Tibet plateau [22], an alkaline lake in Turkey [23], and some eutrophic lakes in England [12].…”

Section: Resultssupporting

confidence: 77%

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Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C₃₇-C₄₀ alkenones by GC-MS

López

Grimalt

2004

J. Am. Soc. Mass Spectrom.

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A method for the identification of double bond locations in polyunsaturated long chain alkenones adapted to nanogram amounts as currently analyzed by gas chromatography coupled to mass spectrometry (GC-MS) has been developed. The method is based on interpretation of the electron impact mass spectra of the imino derivatives of the carbonyl groups using either cyclopentyl or phenyl substitutents. Other complementary derivatization methods such as elaidization and hydrogenation have also been used for structural characterization of these compounds. This application has led to the identification of a novel homologous series of di-, tri-, and tetraunsaturated ketones with carbon number chain lengths between 37 and 40 in coastal hypersaline sediments. The novel series identified shows a distribution in which the double bond position between different homologs is established by reference to the distance from the carbonyl group whereas the previously known alkenones were constituted by unsaturated homologs with double bonds located at defined distances of the terminal methyl. This difference points out to a dissimilar, but still unknown, biogenic precursor of these novel alkenones. (J Am Soc Mass Spectrom 2004, 15, 1161-1172

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Section: Resultssupporting

confidence: 77%

“…However, there are cases of discrepant alkenone distributions in which the sedimentary composition provides clearly unreliable paleotemperature estimates, e.g., lacustrine sediments [12]. In these cases, contributions from species different than those currently found in open marine environments are at the likely origin of the deviations.…”

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confidence: 99%

Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C₃₇-C₄₀ alkenones by GC-MS

López

Grimalt

2004

J. Am. Soc. Mass Spectrom.

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“…Early diagenesis of terrestrial organic matter from higher plants, in modern sediments, peat, lignite, etc., is one of focuses in geological research (Cranwell, 1985;Del Rio et al, 1992;Dehmer, 1995;Pancost et al, 2002;Hajje and Jaffe, 2006), in which some important discoveries about aliphatic hydrocarbons from higher plants have been reported: n-alkanes mainly originate from cuticle waxes and alcohols in higher plants and the dominance of long chain n-alkanes with odd carbon number predominance can indicate higher plant origin (Dehmer, 1995). Terpenoids are common constituents of the resins of higher plants, and they are important biomarkers for higher plants, especially for conifers.…”

Section: Introductionmentioning

confidence: 99%

Long-term, low temperature simulation of early diagenetic alterations of organic matter from conifers: Aliphatic hydrocarbons

2010

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Early diagenetic alterations of organic matter from conifers were simulated at low temperature of 80°C for five and a half years. Their diagenetic products of aliphatic hydrocarbons were identified and quantified. The results reveal that in the early sedimentation of organic matter from conifers, n-alkanes have developed; natural terpenoids have transformed into diagenetic terpenoids, in which some seldom reported evolutionary intermediates-two cadinatetraenes, three norabietatetraenes and one abietatetraene-were detected and identified. The diagenetic pathways for cadalane-type sesquiterpenoids and abietane-type diterpenoids are proposed. The experimental data also show that the diagenesis of aliphatic hydrocarbons is influenced by different inorganic environments. The influences can be concluded as follows: high salinity is propitious to generate and expulse aliphatic hydrocarbons; iron may promote the increase of alkanes, but interrupt the alterations of terpenoids; gypsum, when not coexisting with metal, may slow the degradation from long chain alkanes to short ones; and heavy metal probably delays the early diagenesis of both alkanes and terpenoids. These influences observed under low temperature may enrich studies on early diagenesis of organic matter from higher plants.

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“…Earlier studies (e.g., Cranwell, 1985;Li et al, 1996;Zink et al, 2001;Chu et al, 2005) could not find algal precursors for the long chain alkenones (LCKs) in lakes because of low abundance of such organisms, high algal diversity and seasonal variability in algal assemblages. We chose Lake Xiarinur, which has the highest LCK content of surface sediments among the studied lakes in China (Chu et al, 2005), as a target for tracing alkenone producer organism(s).…”

Section: Introductionmentioning

confidence: 99%

Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

Sun¹,

Chu

Liu

et al. 2007

Organic Geochemistry

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Long-chain unsaturated ketones in recent lacustrine sediments

Cited by 121 publications

References 17 publications

Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C₃₇-C₄₀ alkenones by GC-MS

Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C₃₇-C₄₀ alkenones by GC-MS

Long-term, low temperature simulation of early diagenetic alterations of organic matter from conifers: Aliphatic hydrocarbons

Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

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Long-chain unsaturated ketones in recent lacustrine sediments

Cited by 121 publications

References 17 publications

Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C37-C40 alkenones by GC-MS

Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C37-C40 alkenones by GC-MS

Long-term, low temperature simulation of early diagenetic alterations of organic matter from conifers: Aliphatic hydrocarbons

Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

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Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C₃₇-C₄₀ alkenones by GC-MS

Phenyl- and cyclopentylimino derivatization for double bond location in unsaturated C₃₇-C₄₀ alkenones by GC-MS