Natural chelators in sea water: Detoxification of Zn2+ by brown algal polyphenols |
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Authors: | Mark A Ragan Carolyn M Ragan Arne Jensen |
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Institution: | Atlantic Regional Laboratory, National Research Council of Canada, 1411 Oxford Street, Halifax, N.S., Canada B3H 3Z1;Atlantic Research Centre for Mental Retardation, Dalhousie University, Halifax, N.S., Canada B3H 4H7;Institute of Marine Biochemistry, N-7034 Trondheim-N.T.H., Norway |
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Abstract: | We have examined growth responses of several species of marine phytoplankton, cultured with and without heavy metal stress, to supplements of polymeric polyphenols from the brown algae Ascophyllum nodosum (L.) Le Jol. and Fucus vesiculosus L. In the absence of additional heavy metals. supplements of up to 4000 μg. 1 of polyphenols had a small effect on initial growth rates for three of these microalgae and had no effect on maximum cell densities for four species. One very common, heavy metal-sensitive diatom, Skeletonema costatum (Grev.) Cl., showed significantly increasing maximum cell density in the cultures, with increasing addition of polyphenols to the medium. The toxicity of Zn2+ (0.5–2.0 mg·1 1) to cultures of the diatom Phaeodactylum tricornutum Bohlin was relieved by supplements (100–200 μg·1 1) of the brown algal polyphenols. Exudation of these polyphenols from brown seaweeds may contribute to the natural chelating capacity of inshore sea water. |
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