Toxic effects of TiO<sub>2</sub> particles with different size on the marine microalga

Ma Feifei; Sun Xuemei; Han Qian; Chen Bijuan; Xia Bin; Qu Keming

doi:10.3969/j.issn.0253-4193.2015.10.010

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Ma Feifei, Sun Xuemei, Han Qian, Chen Bijuan, Xia Bin, Qu Keming. Toxic effects of TiO2 particles with different size on the marine microalga[J]. Haiyang Xuebao, 2015, 37(10): 100-105. doi: 10.3969/j.issn.0253-4193.2015.10.010

Citation:

Ma Feifei, Sun Xuemei, Han Qian, Chen Bijuan, Xia Bin, Qu Keming. Toxic effects of TiO₂ particles with different size on the marine microalga[J]. Haiyang Xuebao, 2015, 37(10): 100-105. doi: 10.3969/j.issn.0253-4193.2015.10.010

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Toxic effects of TiO₂ particles with different size on the marine microalga

doi: 10.3969/j.issn.0253-4193.2015.10.010

Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Shandong Provincial Key Laboratory of Fishery Resources and Ecological Environment, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China

Received Date: 2015-01-05

Abstract

Abstract

With the increasing application of nanotechnologies,it is no doubt that more and more engineered nanoparticles end up in marine environment. The toxicity of TiO₂ particles with different sizes (21 nm,60 nm and 400 nm) to the marine microalga Nitzschia closterium was investigated in this study,including the growth inhibition and oxidative stress. The results showed that the toxicity of 1 mg/L TiO₂ particles to N. closterium cells increased with the decrease of particle size,indicating significant nano-effects at 48 h,72 h and 96h exposure,respectively. TiO₂ particles induced excessive reactive oxygen species (ROS) which led to oxidative stress on the algal cells. The antioxidant enzyme activities of N. closterium cells could eliminate some ROS in order to protect algae cells. However,the rest could cause oxidative damage and increase malondialdehyde (MDA) levels concomitantly. In addition,the oxidative damage caused by nano-sized TiO₂ particles (21nm and 60nm) was greater than micro-sized particles. Superoxide dismutase (SOD) and catalase (CAT) activities of the algal cells had different response under the stress of TiO₂ particle with different size. This study shed new light on the assessment of ecological toxicity of engineered nanomaterials.
- TiO₂,
- Nitzschia closterium,
- nanoparticles,
- marine microalga,
- antioxidant enzyme,
- toxic effect

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References(22)

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