Comparative study of UV and visible light induced degradation of lipids in non-axenic senescent cells of Emiliania huxleyi

Christodoulou, Stéphane; Joux, Fabien; Marty, Jean-Claude; Sempéré, Richard; Rontani, Jean‐François

doi:10.1016/j.marchem.2010.01.007

Cited by 28 publications

(47 citation statements)

References 62 publications

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“…In contrast, abiotic oxidation of cis-vaccenic acid (a typical biomarker for Gram-negative bacteria, Sicre et al, 1988;Keweloh and Heipieper, 1996) produces 10-E, 10-Z, 11-E, 12-E, 13-E and 13-Z hydroxyacids, which were useful to estimate autoxidation and photooxidation state of bacteria ( Fig. 2; Christodoulou et al, 2010).…”

Section: Lipid Degradation Products Employed For Photooxidation Automentioning

confidence: 99%

“…3-5) and weakly in fall (photodegradation percentage < 10 %). During the summer period, transfer of singlet oxygen from senescent phytoplanktonic cells to bacteria Christodoulou et al, 2010) seems thus to have been especially efficient. Vaccenic acid also appeared to be affected by autoxidation but less intensively (Figs.…”

Section: Monounsaturated Fatty Acids and N-alkan-1-olsmentioning

confidence: 99%

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Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean)

et al. 2012

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Abstract. The lipid content of seven samples of sinking particles collected with sediment traps moored at ∼ 100 m depth in summer and fall across the Canadian Beaufort Shelf (Arctic Ocean) was investigated. Our main goal was to quantify and characterize the biotic and abiotic degradation processes that acted on sinking material during these periods. Diatoms, which dominated the phytoplanktonic assemblage in every trap sample, appeared to be remarkably sensitive to Type II (i.e. involving singlet oxygen) photodegradation processes in summer, but seemed to be relatively unaffected by biotic degradation at the same time. Hence, the relative recalcitrance of phytodetritus towards biodegradation processes during the Arctic midnight sun period was attributed to the strong photodegradation state of heterotrophic bacteria, which likely resulted from the efficient transfer of singlet oxygen from photodegraded phytoplanktonic cells to attached bacteria. In addition, the detection in trap samples of photoproducts specific to wax ester components found in herbivorous copepods demonstrated that zooplanktonic faecal material exported out of the euphotic zone in summer were affected by Type II photodegradation processes as well. By contrast, sinking particles collected during the autumn were not influenced by any light-driven stress. Further chemical analyses showed that photodegraded sinking particles contained an important amount of intact hydroperoxides, which could then induce a strong oxidative stress in underlying sediments.

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Section: Lipid Degradation Products Employed For Photooxidation Automentioning

confidence: 99%

Section: Monounsaturated Fatty Acids and N-alkan-1-olsmentioning

confidence: 99%

Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean)

et al. 2012

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“…In fact, in phytodetritus, the photodegradation rates were only 3 to 5 times higher for the chlorophyll tetrapyrrolic structure than for the phytyl side-chain Christodoulou et al, 2010). Analysis of isoprenoid photoproducts of chlorophylls after irradiation of different dead phytoplanktonic cells by visible light clearly established that the photodegradation of the chlorophyll phytyl side-chain in phytodetritus involved mainly 1 O 2 .…”

Section: Chlorophyllsmentioning

confidence: 95%

“…Irradiation of dead phytoplankton cells by PAR and UVR radiations results in rapid degradation of chlorophylls (Nelson, 1993;Rontani et al, 1995;Christodoulou et al, 2010). Photodegradation of chlorophyll-a and -c in killed cells of E. huxleyi appeared to be induced by both PAR and UVR (Christodoulou et al, 2010).…”

Section: Chlorophyllsmentioning

confidence: 99%

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Photo- and Free Radical-Mediated Oxidation of Lipid Components During the Senescence of Phototrophic Organisms

Rontani¹

2012

Senescence

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Abiotic Transformation of Unsaturated Lipids and Hydrocarbons in Senescent Phytoplanktonic Cells

Rontani¹

2018

Hydrocarbons, Oils and Lipids: Diversity, Origin, Chemistry and Fate

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Comparative study of UV and visible light induced degradation of lipids in non-axenic senescent cells of Emiliania huxleyi

Cited by 28 publications

References 62 publications

Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean)

Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean)

Photo- and Free Radical-Mediated Oxidation of Lipid Components During the Senescence of Phototrophic Organisms

Abiotic Transformation of Unsaturated Lipids and Hydrocarbons in Senescent Phytoplanktonic Cells

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