Acute and chronic toxicity of amine-functionalized SiO2 nanostructures toward Daphnia magna

Physiological and Behavioral Effects of SiO2 Nanoparticle Ingestion on Daphnia magna

“…Vicentini et al [ 14 ] reported the acute toxicity of SiO 2 NPs by comparing two morphologies, calculating 48 h half-maximal effective concentrations (EC 50 ) of 4.9 mg/mL (tubular) and 2.2 mg/mL (spherical). A comparison between amine-functionalized and 50 nm spherical SiO 2 NPs showed that the acute toxicity of the SiO 2 NPs was 2.2 mg/mL (EC 50 ) [ 13 ]. According to Clement et al [ 15 ], the toxicity of amorphous 14 nm SiO 2 NPs at 72 h was 29.7 mg/L (EC 50 ), and these nanoparticles caused morphological alterations and cellular-level changes including mitochondrial deformation in tissues and deformed nuclei in D. magna eggs.…”

“…On the other hand, Vicentini et al [ 14 ] reported that reproduction decreased significantly upon exposure to concentrations of 50 mg/L 80 nm SiO 2 particles. These conflicting results can be used to elucidate size and surface differences [ 13 ]. In our chronic toxicity test, SiO 2 NPs in the 20 nm and 10 μg/mL groups gave rise to slightly higher reproduction compared to the control series.…”

“…In the last two decades, researchers have consistently assessed the aquatic toxicity of SiO 2 NPs using key parameters such as size, function, and morphology [ 12 ], which are considered crucial factors because of their potential roles in toxicity. Surface modification techniques, such as functionalized and coated nanoparticles, give rise to different properties through covalent bonds and ionic coordination, resulting in alterations in toxicity [ 13 , 14 , 15 ]. Particle size is also an important factor in understanding toxicity because the surface-to-volume ratio and surface reactivity increase as particle size decreases.…”

Effect of Spent Mushroom Substrate on Azo Dye Removal and Effluent Treatment

“…The daphnids were maintained in 2 L beakers with culture medium M4 and a density of one adult organism per 50 mL of medium, temperature at 20 ± 2ºC and photoperiod of 16 h of light/8 h of dark. The medium was changed three times a week and the fed was performed with the green alga Scenedesmus subspicatus (approximately 10 6 cells mL -1 per organism) [18]. For the acute toxicity assays, the raw effluent, and that treated with SMS under the best conditions for two hours was evaluated.…”

Synthesis and toxicity assessment of environment friendly high yield ceria nanoparticles for biosafety

“…The toxic effects of a nano-product could be totally different after surface modification and producers and customers should keep this fact in mind before launching and using a new product [25]. Some reported toxicity effects are of fullerenes, q-dots, silver nanoparticles, a small contribution of carbon nanotubes, and different metals and metallic oxides such as Cu [26], Zn [27] and ZnO [28], SiO2 [29] and TiO2 [27]. As the concerns of scientific society are increasing about the toxicity of nanoparticles.…”