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Int. J. Mol. Sci. 2013, 14(6), 11795-11815; doi:10.3390/ijms140611795
Article

Photochemical Production and Behavior of Hydroperoxyacids in Heterotrophic Bacteria Attached to Senescent Phytoplanktonic Cells

1,2,* , 1,2
,
1,2
 and
1,2
1 Mediterranean Institute of Oceanography (MIO), Aix Marseille Université, CNRS/INSU, IRD, UM 110, 13288 Marseille, France 2 Mediterranean Institute of Oceanography (MIO), Université de Toulon, CNRS/INSU, IRD, UM 110, 83957 La Garde, France
* Author to whom correspondence should be addressed.
Received: 13 March 2013 / Revised: 17 May 2013 / Accepted: 24 May 2013 / Published: 3 June 2013
(This article belongs to the collection Radiation Toxicity in Cells)
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Abstract

The photooxidation of cellular monounsaturated fatty acids was investigated in senescent phytoplanktonic cells (Emiliania huxleyi) and in their attached bacteria under laboratory controlled conditions. Our results indicated that UV-visible irradiation of phytodetritus induced the photooxidation of oleic (produced by phytoplankton and bacteria) and cis-vaccenic (specifically produced by bacteria) acids. These experiments confirmed the involvement of a substantial singlet oxygen transfer from senescent phytoplanktonic cells to attached bacteria, and revealed a significant correlation between the concentration of chlorophyll, a photosensitizer, in the phytodetritus and the photodegradation state of bacteria. Hydroperoxyacids (fatty acid photoproducts) appeared to be quickly degraded to ketoacids and hydroxyacids in bacteria and in phytoplanktonic cells. This degradation involves homolytic cleavage (most likely induced by UV and/or transition metal ions) and peroxygenase activity (yielding epoxy acids).
Keywords: phytoplankton; photodegradation; attached heterotrophic bacteria; cis-vaccenic acid; singlet oxygen transfer phytoplankton; photodegradation; attached heterotrophic bacteria; cis-vaccenic acid; singlet oxygen transfer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Petit, M.; Sempéré, R.; Vaultier, F.; Rontani, J.-F. Photochemical Production and Behavior of Hydroperoxyacids in Heterotrophic Bacteria Attached to Senescent Phytoplanktonic Cells. Int. J. Mol. Sci. 2013, 14, 11795-11815.

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