4.3 Article

Effect of TiO2 nanoparticles and multiwall carbon nanotubes on the freshwater diatom Nitzschia frustulum: evaluation of growth, cellular components and morphology

Journal

CHEMISTRY AND ECOLOGY
Volume 35, Issue 1, Pages 69-85

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/02757540.2018.1528240

Keywords

Nitzschia frustulum; titanium dioxide nanoparticles; multi-walled carbon nanotubes; biochemical responses; morphological changes

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Great attention should be paid to the possible impacts of various nanoparticles on aquatic organism. Freshwater diatoms are essential components of phytoplankton and play a critical role in bioassessment of nanoparticle exposure in the environment. In this study, cell growth was inhibited by TiO2-NPs and MWCNTs, the 24 h EC50 values of TiO2-NPs and MWCNTs to Nitzschia frustulum were 20.75 and 24.64 mg L-1, respectively. Significant decreases of Chl a content after TiO2-NPs exposures were detected and the Chl a content of N. frustulum was obviously increased by MWCNTs treatment at lower concentration. The ROS was detected in N. frustulum after TiO2-NPs and MWCNTs exposures. The MDA content was significantly induced by TiO2-NPs at lower concentrations of 24 and 48 h exposure; meanwhile, it increased at all tested concentrations at 24 h MWCNTs exposure. The SOD enzyme was induced by 72 and 96 h TiO2-NPs exposure, and increased by MWCNTs treatment at 96 h in N. frustulum. Scanning electron microscopy results revealed that N. frustulum had obvious cell deformation after TiO2-NPs treatment. The result showed that the physiological and biochemical response mechanisms after NPs exposure of diatom were species-specific, and in relation to the exposure concentration and time.

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