Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica
Chromatographic and mass spectrometric analysis of surface sediments from perennially ice-covered Lake Fryxell (McMurdo Dry Valleys, East Antarctica) enabled tentative identification from mass spectral data of previously unreported pentaunsaturated ketones, octatriacontapentaen-2-one (C-38 Me-5), no...
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| Format: | Journal Article |
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Elsevier Science
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/17010 |
| _version_ | 1848749341055909888 |
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| author | Jaraula, Caroline Brassell, S. Morgan-Kiss, R. Doran, P. Kenig, F. |
| author_facet | Jaraula, Caroline Brassell, S. Morgan-Kiss, R. Doran, P. Kenig, F. |
| author_sort | Jaraula, Caroline |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Chromatographic and mass spectrometric analysis of surface sediments from perennially ice-covered Lake Fryxell (McMurdo Dry Valleys, East Antarctica) enabled tentative identification from mass spectral data of previously unreported pentaunsaturated ketones, octatriacontapentaen-2-one (C-38 Me-5), nonatriacontapentaen-3-one (C-39 Et-5) and tetradecapentaen-2-one (C-40 Me-5) In addition, the C-37, C-38 and C-40 alkenones occur as di, tri and tetraunsaturated compounds, whereas the C-39 alkenones only include the tetraunsaturated components Analysis of environmental DNA extracted from the water column of Lake Fryxell produced two 18S rDNA sequences closely related to Isochrysis spp, Chrysotila lamellosa and haptophyte sequences previously recognized in sediment samples collected from a Greenland lake and from Ace Lake, Antarctica. Based on the alkenone distribution, coupled with phylogenetic data, we propose that haptophytes related to Isochrysis and/or C lamellosa are the source organisms of alkenones in Lake Fryxell. The occurrence of pentaunsatured alkenones may represent a response to the year-round cold water temperature (ca. 1 degrees C average), likely combined with oxygen supersaturation and growth under light- and nutrient-limited conditions in the upper water column |
| first_indexed | 2025-11-14T07:19:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-17010 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:19:23Z |
| publishDate | 2010 |
| publisher | Elsevier Science |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-170102017-09-13T15:43:05Z Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica Jaraula, Caroline Brassell, S. Morgan-Kiss, R. Doran, P. Kenig, F. ORGANIC-MATTER ACE LAKE LONG-CHAIN-ALKENONES ALKYL ALKENOATES DRY VALLEY LAKES EMILIANIA-HUXLEYI ISOCHRYSIS-GALBANA RADICAL OXIDATION AUTOXIDATION GEPHYROCAPSA-OCEANICA NUTRIENT CONCENTRATIONS Chromatographic and mass spectrometric analysis of surface sediments from perennially ice-covered Lake Fryxell (McMurdo Dry Valleys, East Antarctica) enabled tentative identification from mass spectral data of previously unreported pentaunsaturated ketones, octatriacontapentaen-2-one (C-38 Me-5), nonatriacontapentaen-3-one (C-39 Et-5) and tetradecapentaen-2-one (C-40 Me-5) In addition, the C-37, C-38 and C-40 alkenones occur as di, tri and tetraunsaturated compounds, whereas the C-39 alkenones only include the tetraunsaturated components Analysis of environmental DNA extracted from the water column of Lake Fryxell produced two 18S rDNA sequences closely related to Isochrysis spp, Chrysotila lamellosa and haptophyte sequences previously recognized in sediment samples collected from a Greenland lake and from Ace Lake, Antarctica. Based on the alkenone distribution, coupled with phylogenetic data, we propose that haptophytes related to Isochrysis and/or C lamellosa are the source organisms of alkenones in Lake Fryxell. The occurrence of pentaunsatured alkenones may represent a response to the year-round cold water temperature (ca. 1 degrees C average), likely combined with oxygen supersaturation and growth under light- and nutrient-limited conditions in the upper water column 2010 Journal Article http://hdl.handle.net/20.500.11937/17010 10.1016/j.orggeochem.2009.12.004 Elsevier Science restricted |
| spellingShingle | ORGANIC-MATTER ACE LAKE LONG-CHAIN-ALKENONES ALKYL ALKENOATES DRY VALLEY LAKES EMILIANIA-HUXLEYI ISOCHRYSIS-GALBANA RADICAL OXIDATION AUTOXIDATION GEPHYROCAPSA-OCEANICA NUTRIENT CONCENTRATIONS Jaraula, Caroline Brassell, S. Morgan-Kiss, R. Doran, P. Kenig, F. Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
| title | Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
| title_full | Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
| title_fullStr | Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
| title_full_unstemmed | Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
| title_short | Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
| title_sort | origin and tentative identification of tri to pentaunsaturated ketones in sediments from lake fryxell, east antarctica |
| topic | ORGANIC-MATTER ACE LAKE LONG-CHAIN-ALKENONES ALKYL ALKENOATES DRY VALLEY LAKES EMILIANIA-HUXLEYI ISOCHRYSIS-GALBANA RADICAL OXIDATION AUTOXIDATION GEPHYROCAPSA-OCEANICA NUTRIENT CONCENTRATIONS |
| url | http://hdl.handle.net/20.500.11937/17010 |