TiO2 nanoparticles in the marine environment: Physical effects responsible for the toxicity on algae Phaeodactylum tricornutum

Wang, Yixiang; Zhu, Xiaoshan; Lao, Yong-Min; Lv, Xiaohui; Tao, Yi; Huang, Biao; Wang, Jiangxin; Zhou, Jin; Cai, Zhonghua

doi:10.1016/j.scitotenv.2016.03.164

Cited by 168 publications

(67 citation statements)

References 54 publications

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“…Rather than focusing on the characteristics of each substance, this study focused on the ability of the systematic sequential bioassay for assessing the combined toxic effects of the mixtures (Gao et al, 2013;Grabicova et al, 2013;Masoud et al, 2015;Wang et al, 2016). The Daphnia magna, recommended by the OECD, and the zebrafish transgenic models, both abide by the regulations stated by the OECD while providing the means to efficiently carry out an assessment experiment.…”

Section: Discussionmentioning

confidence: 99%

Sequential assessment via daphnia and zebrafish for systematic toxicity screening of heterogeneous substances

Jang

Park

Kang

et al. 2016

Environmental Pollution

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Section: Discussionmentioning

confidence: 99%

Sequential assessment via daphnia and zebrafish for systematic toxicity screening of heterogeneous substances

Jang

Park

Kang

et al. 2016

Environmental Pollution

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“…However, levels of GSH and CAT activity were enhanced in treatment with 8 µg/L nTiO 2 but decreased at higher concentrations, suggesting that SOD was more sensitive than other indices under oxidative stress. There were no significant differences in MDA contents among treatments and the control, indicating that rotifers could overcome the weak oxidative stress caused by nTiO 2 (Wang et al, 2016). Overall, these results suggested that nTiO 2 induced significant oxidative stress in rotifers, which might not be the major mechanism underlying the toxicity of nTiO 2 rotifers.…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…nTiO 2 powders (anatase type) were purchased from Emperor Nano Material Corporation (Nanjing, China) with an average particle size of 15 nm. A stock solution of 250 mg/L nTiO 2 was prepared by dispersing the nanoparticles in ultrapure water (Direct-Pure adept, RephiLe Bioscience, China) and sonication in a water-bath ultrasonic cleaner (JP-060ST, Skymen, China) for 30 min (Wang et al, 2016). | 231 phase in the BG-11 medium (Dahmani, Zerrouki, Ramanna, Rawat, & Bux, 2016), harvested by centrifugation at 4,000 g for 15 min, and stored at 4°C for feeding rotifers (Guo, Snell, & Yang, 2011).…”

Section: Materials and Test Organismsmentioning

confidence: 99%

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Effects of TiO₂ nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

et al. 2020

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Titanium dioxide nanoparticles (nTiO2) have raised environmental concerns and display potential hazards to aquatic organisms and even humans. However, only a few reports tested the toxicity of nTiO2 to rotifers. In the present study, acute and chronic toxicity of nTiO2 to the freshwater rotifer Brachionus calyciflorus was investigated at different temperatures. At 25°C, the 24 and 48‐hr LC50 was 117.14 and 60.11 mg/L, respectively. At 15°C, 20°C, 25°C, and 30°C, exposure to nTiO2 significantly decreased life expectancy at birth, net reproductive rate, generation time, average lifespan, and/or intrinsic rate of population increase of B. calyciflorus (p < .05). High temperature enhanced the toxicity of nTiO2 to rotifers. The swimming linear speed of rotifers significantly increased (p < .05) in treatments with 200 µg/L nTiO2, compared with the control. In addition, treatments with 8 µg/L to 5 mg/L nTiO2 significantly increased superoxide dismutase activity (p < .05). Glutathione content and catalase activity increased significantly after exposure to 8 µg/L nTiO2 but decreased significantly in treatments with nTiO2 concentrations ranging from 40 µg/L to 5 mg/L (p < .05). There were no significant changes in malondialdehyde contents among nTiO2 treatments and control. Overall, the present study indicated that nTiO2 revealed high toxicity to rotifers, displaying high environmental risks to aquatic ecosystems.

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“…Given that different types of NPs are released into water, released metal‐oxide NPs can react or interact with other NPs and form NHs due to the NPs' large surface area and high reactivity. Besides, the toxicity effect of NPs in aquatic systems has been made for single‐NP types of nanomaterials rather than NHs that consist of two different types of NPs . To the best of our knowledge, in the recent literature, there is no study on the toxicity of NHs to marine microalgae.…”

Section: Introductionmentioning

confidence: 99%

Toxicity of ZnO/TiO₂‐conjugated carbon‐based nanohybrids on the coastal marine alga Thalassiosira pseudonana

Baek

Joo

et al. 2019

Environmental Toxicology

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Increasing consumption of metal-oxide nanoparticles (NPs) and carbon-based nanomaterials has caused significant concern about their potential hazards in aquatic environments. The release of NPs into aquatic environments could result in adsorption of NPs on microorganisms. While metal-oxide NP-conjugated carbon-based nanohybrids (NHs) may exhibit enhanced toxicity toward microorganisms due to their large surface area and the generation of reactive oxygen species (ROS), there is a lack of information regarding the ecotoxicological effects of NHs on marine diatom algae, which are an indicator of marine pollution. Moreover, there is scant information on toxicity mechanisms of NHs on aquatic organisms. In this study, four NHs (ie, ZnOconjugated graphene oxide [GO], ZnO-conjugated carbon nanotubes [CNTs], TiO 2conjugated GO, and TiO 2 -conjugated CNT) that were synthesized by a hydrothermal method were investigated for their toxicity effects on a Thalassiosira pseudonana marine diatom. The in vitro cellular viability and ROS formation employed at the concentration ranges of 50 and 100 mg/L of NHs over 72 hours revealed that ZnO-GO had the most negative effect on T. pseudonana. The primary mechanism identified was the generation of ROS and GO-induced dispersion that caused electrostatic repulsion, preventing aggregation, and an increase in surface areas of NHs. In contrast to GO-induced dispersion, large aggregates were observed in ZnO/TiO 2conjugated CNT-based NHs. The scanning electron microscopy images suggest that NHs covered algae cells and interacted with them (shading effects); this reduced light availability for photosynthesis. Detailed in vitro toxicity effects and mechanisms that cause high adverse acute toxicity on T. pseudonana were unveiled; this implied concerns about potential hazards of these mechanisms in aquatic ecosystems. K E Y W O R D S carbon nanotube, graphene oxide, metal oxides, nanohybrids, Thalassiosira pseudonana,toxicity

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TiO2 nanoparticles in the marine environment: Physical effects responsible for the toxicity on algae Phaeodactylum tricornutum

Cited by 168 publications

References 54 publications

Sequential assessment via daphnia and zebrafish for systematic toxicity screening of heterogeneous substances

Sequential assessment via daphnia and zebrafish for systematic toxicity screening of heterogeneous substances

Effects of TiO₂ nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

Toxicity of ZnO/TiO₂‐conjugated carbon‐based nanohybrids on the coastal marine alga Thalassiosira pseudonana

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TiO2 nanoparticles in the marine environment: Physical effects responsible for the toxicity on algae Phaeodactylum tricornutum

Cited by 168 publications

References 54 publications

Sequential assessment via daphnia and zebrafish for systematic toxicity screening of heterogeneous substances

Sequential assessment via daphnia and zebrafish for systematic toxicity screening of heterogeneous substances

Effects of TiO2 nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

Toxicity of ZnO/TiO2‐conjugated carbon‐based nanohybrids on the coastal marine alga Thalassiosira pseudonana

Contact Info

Product

Resources

About

Effects of TiO₂ nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

Toxicity of ZnO/TiO₂‐conjugated carbon‐based nanohybrids on the coastal marine alga Thalassiosira pseudonana