Comparative toxicity of rod-shaped nano-CeO2 and nano-CePO4 to lettuce.
Metallomics
; 13(7)2021 07 02.
Article
en En
| MEDLINE
| ID: mdl-34100933
ABSTRACT
The influence of morphology on the biological effects of nanomaterials (NMs) has not been well understood. In the present study, we compared the phytotoxicity of rod-shaped nano-cerium dioxide (R-CeO2) and nano-cerium phosphate (R-CePO4) to lettuce plants. The results showed that R-CeO2 significantly inhibited the root elongation of lettuce, induced oxidative damages, and caused cell death, while R-CePO4 was nontoxic to lettuce. The different distribution and speciation of Ce in plant tissues were determined by transmission electron microscopy (TEM) and X-ray absorption near edge spectroscopy (XANES) combined with linear combination fitting (LCF). The results showed that in the R-CeO2 group, part of Ce was transformed from Ce(IV) to Ce(III), while only Ce(III) was present in the R-CePO4 group. When interacting with plants, R-CeO2 is easier to be dissolved and transformed than R-CePO4, which might be the reason for their different phytotoxicity. Although both are Ce-based NMs and have the same morphology, the toxicity of R-CeO2 seems to come from the released Ce3+ ions rather than its shape. This research emphasizes the importance of chemical composition and reactivity of NMs to their toxicological effects.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Fosfatos
/
Cerio
/
Raíces de Plantas
/
Estrés Oxidativo
/
Lactuca
/
Nanopartículas del Metal
Idioma:
En
Revista:
Metallomics
Asunto de la revista:
BIOQUIMICA
Año:
2021
Tipo del documento:
Article
País de afiliación:
China