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Environmentally relevant concentrations of titanium dioxide nanoparticles pose negligible risk to marine microbes.
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Dedman, Craig J., King, Aaron M, Christie-Oleza, Joseph Alexander and Davies, Gemma-Louise (2021) Environmentally relevant concentrations of titanium dioxide nanoparticles pose negligible risk to marine microbes. Environmental Science: Nano, 8 (5). pp. 1236-1255. doi:10.1039/d0en00883d ISSN 2051-8153.
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Official URL: https://doi.org/10.1039/d0en00883d
Abstract
Nano-sized titanium dioxide (nTiO ) represents the highest produced nanomaterial by mass worldwide and, due to its prevalent industrial and commercial use, it inevitably reaches the natural environment. Previous work has revealed a negative impact of nTiO upon marine phytoplankton growth, however, studies are typically carried out at concentrations far exceeding those measured and predicted to occur in the environment currently. Here, a series of experiments were carried out to assess the effects of both research-grade nTiO and nTiO extracted from consumer products upon the marine dominant cyanobacterium, , and natural marine communities at environmentally relevant and supra-environmental concentrations ( , 1 μg L to 100 mg L ). Cell declines observed in cultures were associated with the extensive aggregation behaviour of nTiO in saline media and the subsequent entrapment of microbial cells. Hence, higher concentrations of nTiO particles exerted a stronger decline of cyanobacterial populations. However, within natural oligotrophic seawater, cultures were able to recover over time as the nanoparticles aggregated out of solution after 72 h. Subsequent shotgun proteomic analysis of cultures exposed to environmentally relevant concentrations confirmed minimal molecular features of toxicity, suggesting that direct physical effects are responsible for short-term microbial population decline. In an additional experiment, the diversity and structure of natural marine microbial communities showed negligible variations when exposed to environmentally relevant nTiO concentrations ( , 25 μg L ). As such, the environmental risk of nTiO towards marine microbial species appears low, however the potential for adverse effects in hotspots of contamination exists. In future, research must be extended to consider any effect of other components of nano-enabled product formulations upon nanomaterial fate and impact within the natural environment.
| Item Type: | Journal Article | ||||||||||||||||||||||||
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| Subjects: | Q Science > QD Chemistry Q Science > QR Microbiology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Titanium dioxide, Nanoparticles -- Environmental aspects, Nanostructured materials -- Environmental aspects, Marine algae -- Ecology, Marine microbiology | ||||||||||||||||||||||||
| Journal or Publication Title: | Environmental Science: Nano | ||||||||||||||||||||||||
| Publisher: | Royal Society of Chemistry | ||||||||||||||||||||||||
| ISSN: | 2051-8153 | ||||||||||||||||||||||||
| Official Date: | May 2021 | ||||||||||||||||||||||||
| Dates: |
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| Volume: | 8 | ||||||||||||||||||||||||
| Number: | 5 | ||||||||||||||||||||||||
| Page Range: | pp. 1236-1255 | ||||||||||||||||||||||||
| DOI: | 10.1039/d0en00883d | ||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||
| Date of first compliant deposit: | 17 February 2022 | ||||||||||||||||||||||||
| Date of first compliant Open Access: | 21 February 2022 | ||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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| Is Part Of: | 1 |
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