| Texto completo | |
| Autor(es): |
Barbieri, Edison
;
Araujo, Ana Luzia de Souza
;
dos Santos, Jonas Gomes
;
Owusu, Evans
;
Ottoni, Cristiane Angelica
;
Cerize, Natalia Neto Pereira
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY; v. 108, n. 1, p. 17-pg., 2025-12-13. |
| Resumo | |
In this study, we evaluated the toxicity of silver nanoparticles synthesized from sugarcane bagasse (AgNPs(BCA)) and those coated with polyethyleneimine (AgNPs(BCA-PEI)) in three freshwater invertebrates: Daphnia magna, Cypricercus centrura, and Palaemon pandaliformis. AgNPs(BCA-PEI) exhibited up to similar to 100x greater toxicity than AgNPs(BCA) (LC50: 5-105 mu g/L vs. 2,240-13,070 mu g/L in C. centrura), with D. magna showing the highest sensitivity (LC50: 0.28-0.71 mu g/L). In P. pandaliformis, AgNP exposure reduced oxygen consumption (-67.7% for AgNPs(BCA); -72.4% for AgNPs(BCA-PEI)) and ammonia excretion (-68.3 to -90.1%), likely linked to gill dysfunction and impaired ion regulation. All reductions were statistically significant (p < 0.05) relative to controls. These toxicity levels are markedly higher than those reported for biogenic and commercial AgNPs. The enhanced toxicity of AgNPs(BCA-PEI) is likely associated with the strong cationic surface charge imparted by PEI, which promotes electrostatic interactions with negatively charged cell membranes, increases cellular uptake, and may facilitate greater Ag+ release. Collectively, these results underscore the critical role of surface functionalization in shaping the ecotoxicological profiles of AgNPs and emphasize that even eco-friendly synthesis approaches must account for potential environmental risks associated with nanoparticle modifications. (AU) | |
| Processo FAPESP: | 20/12867-2 - Desenvolvimento e validação de uma tecnologia inovadora de baixo custo, baseada em uma bio- e nano- abordagem na desinfecção da água potável |
| Beneficiário: | Cristiane Angélica Ottoni |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOTA - Regular |