Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 46, Issue 18, Pages 10255-10262Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es3011578
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Funding
- National Basic Research Program of China Water environmental quality evolution and water quality criteria in lakes [2008CB418201]
- Natural Science Foundation of China [40871215]
- Natural Science Foundation of Beijing [8092019]
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This study attempts to understand the impact of different shapes of an individual micro/nanomaterial on their biotoxicities to aquatic organisms. Two differently shaped Cu2O micro/nanocrystals (cubes and octahedrons with side lengths of 900 nm) were exposed to Daphnia magna for 72 h, afterward several antioxidant biomarkers such as reactive oxygen species (ROS), catalase (CAT), total antioxidant capacity (T-AOC), and malondialdehyde (MDA) in D. magna were measured. We demonstrated the differential influences of two crystallographic Cu2O nanocrystals on the antioxidant process. Specifically, octahedral Cu2O nanocrystals showed a higher level of oxidative stress, possibly because of its larger surface area and higher reaction activity of the octahedron. The biomarker results further showed that the oxidative stress and antioxidant mechanism process involved three stages-antioxidant response, oxidation inhibition, and antioxidant inactivation. Furthermore, the accumulation of MDA was mainly responsible for the ROS-induced toxicity.
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