John Wiley & Sons, Ltd.

Cadmium sulfide quantum dots induce oxydative‐stress and behavioural impairments in the marine clam Scrobicularia plana

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CdS quantum dots (CdS QDs) have a number of current applications in electronics and solar cells and significant future potential in medicine. The aim of this study was to examine the toxic effects of CdS QDs on the marine clam Scrobicularia plana exposed for 14 days to these nanomaterials (10 µg Cd L−1) in natural seawater and to compare them to soluble Cd. Measurement of labile Cd released from CdS QDs showed that 52% of CdS QDs remained in nanoparticulate form. Clams accumulated the same levels of Cd regardless of the form it was delivered (soluble Cd vs CdS QDs). However, significant changes of biochemical responses were observed in clams exposed to CdS QDs compared with soluble Cd. Increased activities of Catalase (CAT) and glutathione‐S‐transferase (GST) were significantly higher in clams exposed in seawater to Cd as nanoparticulate vs soluble form, suggesting a specific “nano” effect. Behaviour of S. plana inside sediment showed impairments of foot movements only in the case of exposure to CdS QDs. This study shows that oxidative‐stress and behaviour biomarkers are sensitive predictors of CdS QDs toxicity in S. plana. Such responses appearing well before changes might occur at population level, demonstrate the usefulness of this model species and type of biomarker in the assessment of NPs contamination in estuarine ecosystems. This article is protected by copyright. All rights reserved

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