Diminishing bioavailability and toxicity of P25 TiO2 NPs during continuous exposure to marine algae Chlorella sp.

Thiagarajan, Vignesh; Pavani, M; Archanaa, S.; Seenivasan, R.; Chandrasekaran, N.; Suraishkumar, G. K.; Mukherjee, Amitava

doi:10.1016/j.chemosphere.2019.05.270

Cited by 33 publications

(20 citation statements)

References 44 publications

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“…It is widely acknowledged that the fate and behaviour of nanomaterials within the natural environment will determine their bioavailability and hence likely effect upon biota (Rodea-Palomares et al, 2010;Hazeem et al, 2016;Thiagarajan et al, 2019). Upon entry into the aquatic environment, nCeO 2 may be transported freely in suspension, aggregate to other nCeO 2 particles (homo-aggregation) or aggregate to other particulate matter (hetero-aggregation).…”

Section: Discussionmentioning

confidence: 99%

Investigating the Impact of Cerium Oxide Nanoparticles Upon the Ecologically Significant Marine Cyanobacterium Prochlorococcus

et al. 2021

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Cerium oxide nanoparticles (nCeO2) are used at an ever-increasing rate, however, their impact within the aquatic environment remains uncertain. Here, we expose the ecologically significant marine cyanobacterium Prochlorococcus sp. MED4 to nCeO2 at a wide range of concentrations (1 μg L–1 to 100 mg L–1) under simulated natural and nutrient rich growth conditions. Flow cytometric analysis of cyanobacterial populations displays the potential of nCeO2 (100 μg L–1) to significantly reduce Prochlorococcus cell density in the short-term (72 h) by up to 68.8% under environmentally relevant conditions. However, following longer exposure (240 h) cyanobacterial populations are observed to recover under simulated natural conditions. In contrast, cell-dense cultures grown under optimal conditions appear more sensitive to exposure during extended incubation, likely as a result of increased rate of encounter between cyanobacteria and nanoparticles at high cell densities. Exposure to supra-environmental nCeO2 concentrations (i.e., 100 mg L–1) resulted in significant declines in cell density up to 95.7 and 82.7% in natural oligotrophic seawater and nutrient enriched media, respectively. Observed cell decline is associated with extensive aggregation behaviour of nCeO2 upon entry into natural seawater, as observed by dynamic light scattering (DLS), and hetero-aggregation with cyanobacteria, confirmed by fluorescent microscopy. Hence, the reduction of planktonic cells is believed to result from physical removal due to co-aggregation and co-sedimentation with nCeO2 rather than by a toxicological and cell death effect. The observed recovery of the cyanobacterial population under simulated natural conditions, and likely reduction in nCeO2 bioavailability as nanoparticles aggregate and undergo sedimentation in saline media, means that the likely environmental risk of nCeO2 in the marine environment appears low.

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Section: Discussionmentioning

confidence: 99%

Investigating the Impact of Cerium Oxide Nanoparticles Upon the Ecologically Significant Marine Cyanobacterium Prochlorococcus

et al. 2021

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“…32 In response to NM exposure, marine phytoplankton have been observed to enhance the production of exopolymeric substances (EPS). [78][79][80][81][82] The secretion of EPS is associated with microbial stress and believed a defence mechanism against NMs. 78 For example, EPS was shown to protect the freshwater cyanobacterium Synechocystis PCC6803 from nTiO 2 -mediated stress by quenching toxic ROS species and reducing direct contact of nanoparticles with the cell surface.…”

Section: Physical Toxicity and Entrapment Of Cyanobacteria By Ntiomentioning

confidence: 99%

“…The fate and behaviour of NMs upon entry into the environment largely determines their bioavailability and mechanism of toxicity towards biota, and is therefore a key consideration during nano-ecotoxicological research. 73,75,82 Upon entry into saline media with high ionic strength (∼0.7 eq L −1 ), 89 metal oxide NMs have generally been observed to aggregate freely and undergo sedimentation, at a faster rate than bulk material. 36,89 Herein, we utilised dynamic light scattering (DLS) methods to confirm that research-grade nTiO 2 (1 and 100 mg L −1 ) displays rapid aggregation upon entry into saline media.…”

Section: Behaviour Of Ntio 2 In Seawatermentioning

confidence: 99%

“…As a result, the bioavailability of nTiO 2 towards Environmental Science: Nano Paper planktonic organisms displays a continual decrease, as has been recorded previously. 82 As such, the risk of nTiO 2 towards marine microbial species appears lowered during extended exposure. However, at high concentrations, negative effects of exposure may be experienced for longer periods as populations take time to recover or nTiO 2 takes longer durations to enter lower fractions of the water column.…”

Section: Behaviour Of Ntio 2 In Seawatermentioning

confidence: 99%

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Environmentally relevant concentrations of titanium dioxide nanoparticles pose negligible risk to marine microbes

Dedman

King

Christie-Oleza

et al. 2021

Environ. Sci.: Nano

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“…The oxidative stress indicators with decreased levels across the cycles manifest the decrease in toxic effects. Thiagarajan et al demonstrate that the nanoparticles' continuous exposure to algal cells (e.g., Chlorella vulgaris cells) would significantly reduce their toxic impact [69].…”

Section: Toxicity Of Photocatalyst Nanoparticles To Chlorella Vulgarismentioning

confidence: 99%

Aquatic Toxicity of Photocatalyst Nanoparticles to Green Microalgae Chlorella vulgaris

Adochite

Andronic

2020

Water

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In the last years, nanoparticles such as TiO2, ZnO, NiO, CuO and Fe2O3 were mainly used in wastewater applications. In addition to the positive aspects concerning using nanoparticles in the advanced oxidation process of wastewater containing pollutants, the impact of these nanoparticles on the environment must also be investigated. The toxicity of nanoparticles is generally investigated by the nanomaterials’ effect on green algae, especially on Chlorella vulgaris. In this review, several aspects are reviewed: the Chlorella vulgaris culture monitoring and growth parameters, the effect of different nanoparticles on Chlorella vulgaris, the toxicity of photocatalyst nanoparticles, and the mechanism of photocatalyst during oxidative stress on the photosynthetic mechanism of Chlorella vulgaris. The Bold basal medium (BBM) is generally recognized as an excellent standard cultivation medium for Chlorella vulgaris in the known environmental conditions such as temperature in the range 20–30 °C and light intensity of around 150 μE·m2·s−1 under a 16/8 h light/dark cycle. The nanoparticles synthesis methods influence the particle size, morphology, density, surface area to generate growth inhibition and further algal deaths at the nanoparticle-dependent concentration. Moreover, the results revealed that nanoparticles caused a more potent inhibitory effect on microalgal growth and severely disrupted algal cells’ membranes.

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Diminishing bioavailability and toxicity of P25 TiO2 NPs during continuous exposure to marine algae Chlorella sp.

Cited by 33 publications

References 44 publications

Investigating the Impact of Cerium Oxide Nanoparticles Upon the Ecologically Significant Marine Cyanobacterium Prochlorococcus

Investigating the Impact of Cerium Oxide Nanoparticles Upon the Ecologically Significant Marine Cyanobacterium Prochlorococcus

Environmentally relevant concentrations of titanium dioxide nanoparticles pose negligible risk to marine microbes

Aquatic Toxicity of Photocatalyst Nanoparticles to Green Microalgae Chlorella vulgaris

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