Cell-wall-dependent effect of carboxyl-CdSe/ZnS quantum dots on lead and copper availability to green microalgae

The present study examines the effect of carboxyl-CdSe/ZnS quantum dots (QDs) on Cu and PI) availability to microalgae with different cell wall characteristics: Chlorella kesslerii possessing a cellulosic cell wall and two strains of Chlamydomonas reinhardtii, a wall-less and a walled strain containing glycoproteins as the main cell wall component. Results demonstrated that QDs decreased Pb and Cu intracellular contents ({Cu}(int) and {Pb}(int)) in walled strains by a factor of 2.5 and 2, respectively, as expected by the decrease of about 70% and 40% in the dissolved Cu and Pb concentrations. QDs increased {Cu}(int) and {Pb}(int) in wall-less strain by a factor of 4 and 3.5. These observations were consistent with the observed association of QDs to the wall-less C. reinhardtii, and lack of association to walled algal strain:;. Suwannee River humic acid did not influence metal association to QDs, but decreased {Cu}(int) and {Pb}(int) in all microalgae. (C) 2012 Elsevier Ltd. All rights reserved.

Published in:
Environmental Pollution, 167, 27-33

 Record created 2012-07-13, last modified 2018-03-17

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