Carbon nanotube compared with carbon black: effects on bacterial survival against grazing by ciliates and antimicrobial treatments

Chan, Tiffany Sin Yu; Nasser, Fatima; St-Denis, Christine H; Mandal, Himadri; Ghafari, Parnian; Hadjout-Rabi, Nacima; Bols, Niels C.; Tang, Xiaowu Shirley

doi:10.3109/17435390.2011.652205

Cited by 13 publications

(9 citation statements)

References 29 publications

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“…Additionally, the information collected to the NanoE-Tox database indicated that ENMs were readily ingested by different organisms [55,72,77,[119][120][121][122][123]192,[194][195][196][197][198][199][200][201][202] and tended to accumulate in them [55,59,60,[69][70][71]84,[122][123][124][125][126]159,[176][177][178][179]187,189,192,[201][202][203][204][205][206][207][208][209][210][211]…”

Section: Mechanism Of Toxic Actionmentioning

confidence: 99%

NanoE-Tox: New and in-depth database concerning ecotoxicity of nanomaterials

Juganson¹,

Ivask²,

Blinova³

et al. 2016

Nano Online

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The increasing production and use of engineered nanomaterials (ENMs) inevitably results in their higher concentrations in the environment. This may lead to undesirable environmental effects and thus warrants risk assessment. The ecotoxicity testing of a wide variety of ENMs rapidly evolving in the market is costly but also ethically questionable when bioassays with vertebrates are conducted. Therefore, alternative methods, e.g., models for predicting toxicity mechanisms of ENMs based on their physico-chemical properties (e.g., quantitative (nano)structure-activity relationships, QSARs/QNARs), should be developed. While the development of such models relies on good-quality experimental toxicity data, most of the available data in the literature even for the same test species are highly variable. In order to map and analyse the state of the art of the existing nanoecotoxicological information suitable for QNARs, we created a database NanoE-Tox that is available as Supporting Information File 2. The database is based on existing literature on ecotoxicology of eight ENMs with different chemical composition: carbon nanotubes (CNTs), fullerenes, silver (Ag), titanium dioxide (TiO 2), zinc oxide (ZnO), cerium dioxide (CeO 2), copper oxide (CuO), and iron oxide (FeO x ; Fe 2 O 3 , Fe 3 O 4). Altogether, NanoE-Tox database consolidates data from 224 articles and lists altogether 1,518 toxicity values (EC 50 /LC 50 / NOEC) with corresponding test conditions and physico-chemical parameters of the ENMs as well as reported toxicity mechanisms and uptake of ENMs in the organisms. 35% of the data in NanoE-Tox concerns ecotoxicity of Ag NPs, followed by TiO 2 (22%), CeO 2 (13%), and ZnO (10%). Most of the data originates from studies with crustaceans (26%), bacteria (17%), fish (13%), and algae (11%). Based on the median toxicity values of the most sensitive organism (data derived from three or more articles) the toxicity order was as follows: Ag > ZnO > CuO > CeO 2 > CNTs > TiO 2 > FeO x. We believe NanoE-Tox database contains valuable information for ENM environmental hazard estimation and development of models for predicting toxic potential of ENMs. selected from the review by Bondarenko et al. [4]. Numbers below each application category indicate the number and share of papers retrieved. The numerical data are presented in Table S1 (Supporting Information File 1). The bibliometric data search was performed in Thomson Reuters WoS on March 19, 2015.

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Section: Mechanism Of Toxic Actionmentioning

confidence: 99%

NanoE-Tox: New and in-depth database concerning ecotoxicity of nanomaterials

Juganson¹,

Ivask²,

Blinova³

et al. 2016

Nano Online

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“…Increased use of nanomaterials, including CNT, increases the likelihood that microorganisms used in industrial processes will also be affected, which may be a problem for e.g. wastewater treatment plants [106,107,112]. …”

Section: Effects In Living Organismsmentioning

confidence: 99%

Bioaccumulation and ecotoxicity of carbon nanotubes

Jackson

Jacobsen

Baun

et al. 2013

Chemistry Central Journal

239

130

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Carbon nanotubes (CNT) have numerous industrial applications and may be released to the environment. In the aquatic environment, pristine or functionalized CNT have different dispersion behavior, potentially leading to different risks of exposure along the water column. Data included in this review indicate that CNT do not cross biological barriers readily. When internalized, only a minimal fraction of CNT translocate into organism body compartments. The reported CNT toxicity depends on exposure conditions, model organism, CNT-type, dispersion state and concentration. In the ecotoxicological tests, the aquatic organisms were generally found to be more sensitive than terrestrial organisms. Invertebrates were more sensitive than vertebrates. Single-walled CNT were found to be more toxic than double-/multi-walled CNT. Generally, the effect concentrations documented in literature were above current modeled average environmental concentrations. Measurement data are needed for estimation of environmental no-effect concentrations. Future studies with benchmark materials are needed to generate comparable results. Studies have to include better characterization of the starting materials, of the dispersions and of the biological fate, to obtain better knowledge of the exposure/effect relationships.

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“…Accumulation of fecal pellets in the medium was not evident in the images of T. thermophila grown in rich medium (Figure 2), indicating that MWCNTs were excreted as aggregates that were small enough for reuptake, resulting in a higher percentage of administered MWCNTs in the protozoan population (Figure 3). Comparatively, Chan et al 41 showed that initial ingestion of subtoxic amounts of SWCNTs by T. thermophila impaired subsequent digestion of Escherichia coli and increased the number of egested fecal pellets. Here, grazing on MWCNT-amended P. aeruginosa did not appear to alter the numbers of fecal pellets compared to control cultures (Figures 4 and S7).…”

Section: Resultsmentioning

confidence: 99%

Bioaccumulation of Multiwall Carbon Nanotubes in Tetrahymena thermophila by Direct Feeding or Trophic Transfer

Mortimer

Petersen

Buchholz

et al. 2016

Environ. Sci. Technol.

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Consumer goods contain multiwall carbon nanotubes (MWCNTs) that could be released during product life cycles into the environment, where their effects are uncertain. Here, we assessed MWCNT bioaccumulation in the protozoan Tetrahymena thermophila via trophic transfer from bacterial prey (Pseudomonas aeruginosa) versus direct uptake from growth media. The experiments were conducted using 14C-labeled MWCNT (14C-MWCNT) doses at or below 1 mg/L, which proved subtoxic since there were no adverse effects on the growth of the test organisms. A novel contribution of this study was the demonstration of the ability to quantify MWCNT bioaccumulation at low (sub µg/kg) concentrations accomplished by employing accelerator mass spectrometry (AMS). After the treatments with MWCNTs at nominal concentrations of 0.01 mg/L and 1 mg/L, P. aeruginosa adsorbed considerable amounts of MWCNTs: (0.18 ± 0.04) µg/mg and (21.9 ± 4.2) µg/mg bacterial dry mass, respectively. At the administered MWCNT dose of 0.3 mg/L, T. thermophila accumulated up to (0.86 ± 0.3) µg/mg and (3.4 ± 1.1) µg/mg dry mass by trophic transfer and direct uptake, respectively. Although MWCNTs did not biomagnify in the microbial food chain, MWCNTs bioaccumulated in the protozoan populations regardless of the feeding regime, which could make MWCNTs bioavailable for organisms at higher trophic levels.

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Carbon nanotube compared with carbon black: effects on bacterial survival against grazing by ciliates and antimicrobial treatments

Cited by 13 publications

References 29 publications

NanoE-Tox: New and in-depth database concerning ecotoxicity of nanomaterials

NanoE-Tox: New and in-depth database concerning ecotoxicity of nanomaterials

Bioaccumulation and ecotoxicity of carbon nanotubes

Bioaccumulation of Multiwall Carbon Nanotubes in Tetrahymena thermophila by Direct Feeding or Trophic Transfer

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