Interaction of TiO 2 nanoparticles with the marine microalga Nitzschia closterium : Growth inhibition, oxidative stress and internalization

Xia, Bin; Chen, Bijuan; Sun, Xuemei; Qu, Kun; Ma, Feifei; Du, Meirong

doi:10.1016/j.scitotenv.2014.11.066

Cited by 220 publications

(104 citation statements)

References 61 publications

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“…Ma et al studied the aggregation of algal cells in the presence of oxide nanoparticles as affected by ionic strength and pH [29]. Xia et al reported aninernization of nano-TiO 2 particles in marine microalga Nitzschia closterium [30].…”

Section: Introductionmentioning

confidence: 99%

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Lin

Tseng²,

Huang

2015

Front. Chem. Sci. Eng.

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Nano-sized titanium dioxide (nano-TiO 2 ) has wide industrial applications and therefore considerable chances of exposure are created for human beings and ecosystems. To better understand the interactions between nano-TiO 2 and aquatic organisms, we first studied TiO 2 uptake by algae exemplified by Pseudokirchneriella subcapitata. P. subcapitata were exposed to nano-TiO 2 in a series of concentrations and at various pH. TiO 2 uptake was quantified using a sedimentation curve analysis technique. After exposure of algae to TiO 2 , the variation of zeta potential was measured and the morphology of algae-TiO 2 aggregate was observed with scanning electron microscopy and the optical microscopy. The steady-state TiO 2 uptake was found to be pH-dependent and the isotherms can be described well by Freundlich model. TiO 2 deposited on algal surfaces causes the shift of pH zpc of TiO 2 -covered algae from that of algae toward that of TiO 2 . The attraction between TiO 2 -covered algal cells induces the agglomeration of algae and TiO 2 and thus the formation of algae-TiO 2 aggregates in the size of 12 to 50 µm. The 2-D fractal dimension of the aggregates is pHdependent and ranges from 1.31 to 1.67. The theoretical analysis of the Gibbs energy of interaction indicates that both TiO 2 uptake by algae and the formation of algae-TiO 2 aggregate are influenced by the interaction between TiO 2 particles.

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Section: Introductionmentioning

confidence: 99%

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Lin

Tseng²,

Huang

2015

Front. Chem. Sci. Eng.

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“…The transmission electron microscopy (TEM) observation of algae cells followed a modified procedure described by Xia et al, [17]. All samples (treated and untreated cells) were postfixed in 1% osmic acid for 1 h and washed with phosphate butter solution (PBS, pH 7.0) for 3 times.…”

Section: Sem and Tem Observationsmentioning

confidence: 99%

Influence of Speciation of Thorium on Toxic Effects to Green Algae Chlorella pyrenoidosa

Peng

Ding

et al. 2017

Preprint

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Thorium (Th) is a natural radioactive element present in the environment and has a potential to be used as a nuclear fuel. Relatively little is known about the influence and toxicity of Th in the environment. In the present study, the toxicity of Th to the green algae Chlorella pyrenoidosa (C. Pyrenoidosa) was evaluated by algal growth inhibition, biochemical assays and morphologic observations. In the cultural medium (OECD TG 201), Th(NO3)4 was transformed to amorphous precipitation of Th(OH)4 due to hydrolysis. Th was toxic to C. Pyrenoidosa, with a 96 h half maximum effective concentration (EC50) of 10.4 μM. Scanning electron microscopy shows that Th-containing aggregates were attached onto the surface of the algal cells, and transmission electron microscopy indicates the internalization of nano-sized Th precipitates and ultrastructural alterations of the algal cells. The heteroagglomeration between Th(OH)4 precipitation and alga cells and enhanced oxidative stress might play important roles in the toxicity of Th. To our knowledge, this is the first report of the toxicity of Th to algae with its chemical species in the exposure medium. This finding provides useful information on understanding the fate and toxicity of Th in the aquatic environment.

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“…Nanoparticles between 1 and 100 nm have been reported as toxic to algae [14][15][16]. Inhibitory effects of metal oxide nanoparticles against microalgae due to reactive oxygen species generation [17,18], mechanical damage [19], light shading effect [20], interactions with nutrients [21] and other factors [22] were reported. Accordingly, the aim of this study was to determine the inhibitory effect of cobalt nano particles (CoNPs) on microalgae isolated from fresh water cyanobacterial blooms by assessing the effects on growth rate, biomass concentration, photosynthetic pigments concentration and antioxidant enzyme activity.…”

Section: Introductionmentioning

confidence: 99%

Inhibition Effects of Cobalt Nano Particles Against Fresh Water Algal Blooms Caused by Microcystis and Oscillatoria

Anusha¹

2017

AJASR

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Cyanobacterial blooms deplete nutrients, reduce water clarity, exhaust carbon di oxide and produces secondary metabolites which negatively affect aquatic organisms and water quality. Control of algal blooms using metal nano particles is one effective method for the safety of water environment. Cobalt nano particles (CoNPs) were synthesized and tested against microalgae isolated from fresh water cyanobacterial blooms by assessing the effects on growth rate, biomass concentration, photosynthetic pigments concentration and antioxidant enzyme activity. Microcystis and Oscillatoria were identified as the predominant isolates from algal blooms and treated with varying concentrations (1, 2, 3, 4 and 5 mg·L -1 ) of CoNPs. Steady decline in the growth rate of microalgae was observed at the end of 5 days indicating the toxicity of CoNPs on microalgal growth. At the end of cultivation period, 78% and 88% of reduction in biomass concentration of Microcystis and Oscillatoria were observed at 5 mg·L -1 of CoNPs. The chlorophyll content was reduced from 1.53 to 0.24 mg·L -1 in Microcystis and 1.63 to 0.29 mg·L -1 in Oscillatoria. There was a 69.3% and 73.2% decrease in carotenoid content of Microcystis and Oscillatoria respectively. Both protein and carbohydrate contents of the microalgae were reduced with increasing concentration of nano particles. The decrease in Super oxide dismutase (SOD) activity with increased nanoparticle concentration reveals the formation of stress in the microalgae. The increasing GSH activity proved the effect of CoNPs on the activation of antioxidative enzymes to protect the cells. This study demonstrates the efficiency of cobalt nano particles (CoNPs) on inhibition of fresh water algal blooms thereby reducing the eutrophication problem.

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Interaction of TiO 2 nanoparticles with the marine microalga Nitzschia closterium : Growth inhibition, oxidative stress and internalization

Cited by 220 publications

References 61 publications

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Influence of Speciation of Thorium on Toxic Effects to Green Algae <em>Chlorella pyrenoidosa</em>

Inhibition Effects of Cobalt Nano Particles Against Fresh Water Algal Blooms Caused by <i>Microcystis</i> and <i>Oscillatoria</i>

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Interaction of TiO 2 nanoparticles with the marine microalga Nitzschia closterium : Growth inhibition, oxidative stress and internalization

Cited by 220 publications

References 61 publications

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Influence of Speciation of Thorium on Toxic Effects to Green Algae <em>Chlorella pyrenoidosa</em>

Inhibition Effects of Cobalt Nano Particles Against Fresh Water Algal Blooms Caused by &lt;i&gt;Microcystis&lt;/i&gt; and &lt;i&gt;Oscillatoria&lt;/i&gt;

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Inhibition Effects of Cobalt Nano Particles Against Fresh Water Algal Blooms Caused by <i>Microcystis</i> and <i>Oscillatoria</i>