Lipids of aquatic organisms as potential contributors to lacustrine sediments—II

Cranwell, P.A.; Eglinton, G.; Robinson, Neil

doi:10.1016/0146-6380(87)90007-6

Cited by 736 publications

(390 citation statements)

References 56 publications

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“…This is illustrated in Figure 10 for the cyclopentyl-and phenylimino derivatives of 6,10,14-trimethylpentadecan-2-one. This isoprenoid alkenone has also been found in the hypersaline sediments considered in the present study and originates from phytol degradation in recent environments [33][34][35]. The spectra show the homologous series of fragments at m/z 110 ϩ 14 y and 118 ϩ 14 y mentioned above, interrupted by increments of 28 da due to the presence of methyl substituents.…”

Section: Imino Derivatization Of Regular Isoprenoid Alkenonessupporting

confidence: 71%

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: Imino Derivatization Of Regular Isoprenoid Alkenonessupporting

confidence: 71%

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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“…n-Alkan-2-ones also occur in peat (Morrison and Bick, 1967;Lehtonen and Ketola, 1990;Xie et al, 2004;Nichols and Huang, 2007;Zheng et al, 2007;Ortiz et al, 2010;López-Días et al, 2013b). They may have diverse origins, including direct input from plants (Arpino et al, 1970;Volkman et al, 1981), microbial oxidation of n-alkanes (Cranwell et al, 1987;Ambles et al, 1993;Jaffé et al, 1993Jaffé et al, , 1996van Bergen et al, 1998), microbial~-oxidation and decarboxylation of fatty acids (FAs; Volkman et al, 1983;Chaffee et al, 1986;de Leeuw, 1986;Quénéa et al, 2004) and bacterial material (López-Días et al, 2013b).…”

mentioning

confidence: 99%

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Ortíz

Borrego

Gallego

et al. 2016

Organic Geochemistry

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A B S T R A C TWe determined the lipid distributions (n-alkanes, n-alkan-2-ones, n-alkanoic acids), total organic carbon (TOC), total nitrogen (TN), CajMg and ash content in Las Conchas mire, a 3.2 m deep bryophytedominated mire in Northern Spain covering 8000 cal yr BP. Bog conditions developed in the bottom 20 cm of the profile, and good preservation of organic matter (OM) was inferred from n-alkanoic acid distribution, with the exception of the uppermost 20 cm (last ca. 200 yr). Microbial synthesis of long chain saturated fatty acids from primary OM likely produced a dominance of short chain n-alkanoic acids with a bimodal distribution, as well as the lack of correspondence between the n-alkane and n-alkanoic acid profiles in the upper 20 cm. This was accompanied by an increase in ash content, a decrease in TOC and variation in n-alkane ratio s, thereby suggesting significant changes in the mire, namely drainage and transformation to a meadow, in the last ca. 200 yr. The distribution of n-alkan-2-ones indicated an increase in bacterial source from the bottom of the record to 94 cm, whereas their distribution in the upper part could be attributed mainly to plant input andjor the microbial oxidation of n-alkanes. The different n-alkane proxies showed variations, which we interpreted in terms of changes in vegetation (Sphagnum vs. non-Sphagnum dominated phases) during the last 8000 cal yr BP. C 23 was the most abundant homolog throughout most ofthe record, thereby suggesting dominant humid conditions alternating with short drier phases. However, such humid conditions were not linked to paleoclimatic variation but rather to geomorphological characteristics: Las Conchas mire, at the base of the Cuera Range, receives continuous runoff-even during drier periods-which is not necessarily accompanied by additional mineral input to peat, producing the development of Sphagnum moss typical of waterlogged ecotopes and damp habitats. Thus, although geochemical proxies indicated an ombrotrophic regime in the mire, geomorphological characteristics may make a considerable contribution to environmental conditions.

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“…Each sample can be characterized by the predominant n-alkane chain length. Their distribution in phytoplankton and algae is dominated by low MW nalkanes, maximizing at C 17 (Gelpi et al, 1970;Blumer et al, 1971;Cranwell et al, 1987). Submerged/floating macrophytes maximize at C 21 , C 23 and C 25 (Cranwell, 1984;Ogura et al, 1990;Viso et al, 1993), while emergent macrophytes have a composition similar to that of terrestrial plants, peaking at C 27 and C 29 (Cranwell, 1984).…”

Section: Bíomarker Proxíesmentioning

confidence: 97%

“…Submerged/floating macrophytes maximize at C 21 , C 23 and C 25 (Cranwell, 1984;Ogura et al, 1990;Viso et al, 1993), while emergent macrophytes have a composition similar to that of terrestrial plants, peaking at C 27 and C 29 (Cranwell, 1984). Terrigenous plants contain a high proportion of HMW nalkanes (C 27 , C 29 and C 31 ) in their epicuticular wax Hamilton, 1963, 1967;Eglinton and Calvin, 1967;Cranwell et al, 1987;Rieley et al, 1991;Nott et al, 2000;Pancost et al, 2002). Deciduous trees typically maximize at C 27 , whereas in marsh plants and possibly grasses C 31 is dominant (Cranwell et al, 1987;Schwark et al, 2002;Ortiz et al, 2004Ortiz et al, , 2011.…”

Section: Bíomarker Proxíesmentioning

confidence: 99%

“…Terrigenous plants contain a high proportion of HMW nalkanes (C 27 , C 29 and C 31 ) in their epicuticular wax Hamilton, 1963, 1967;Eglinton and Calvin, 1967;Cranwell et al, 1987;Rieley et al, 1991;Nott et al, 2000;Pancost et al, 2002). Deciduous trees typically maximize at C 27 , whereas in marsh plants and possibly grasses C 31 is dominant (Cranwell et al, 1987;Schwark et al, 2002;Ortiz et al, 2004Ortiz et al, , 2011. However, data from a broad survey of modern plants show that n-alkane chain length distributions are highly variable within plant groups, and chemotaxonomic distinction between grasses and woody plants is difficult, with the exception of aquatic plants and Sphagnum moss (Bush and Mclnerney, 2013).…”

Section: Bíomarker Proxíesmentioning

confidence: 99%

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Lipid biomarkers in Lake Enol (Asturias, Northern Spain): Coupled natural and human induced environmental history

Ortíz

Sánchez‐Palencia

Torres

et al. 2016

Organic Geochemistry

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Lipids of aquatic organisms as potential contributors to lacustrine sediments—II

Cited by 736 publications

References 56 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

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Lipid biomarkers in Lake Enol (Asturias, Northern Spain): Coupled natural and human induced environmental history

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Lipids of aquatic organisms as potential contributors to lacustrine sediments—II

Cited by 736 publications

References 56 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

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Lipid biomarkers in Lake Enol (Asturias, Northern Spain): Coupled natural and human induced environmental history

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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