Differential oxidative stress of octahedral and cubic Cu2O micro/nanocrystals to Daphnia magna.
Environ Sci Technol
; 46(18): 10255-62, 2012 Sep 18.
Article
en En
| MEDLINE
| ID: mdl-22894800
This study attempts to understand the impact of different shapes of an individual micro/nanomaterial on their biotoxicities to aquatic organisms. Two differently shaped Cu(2)O 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 Cu(2)O nanocrystals on the antioxidant process. Specifically, octahedral Cu(2)O 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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Contaminantes Químicos del Agua
/
Estrés Oxidativo
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Cobre
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Daphnia
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Nanopartículas
Límite:
Animals
Idioma:
En
Revista:
Environ Sci Technol
Año:
2012
Tipo del documento:
Article
Pais de publicación:
Estados Unidos