Data/hora: 06/06/2024 02:20:47

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	25/01/2016	
Data da última atualização: 	15/04/2016	
Autoria: 	GRILLO, R.; CLEMENTE, Z.; OLIVEIRA, J. L. de; CAMPOS, E. V. R.; CHALUPE, V. C.; JONSSON, C. M.; LIMA, R.; SANCHES, G.; NISHISAKA, C. S.; ROSA, A. H.; OEHLKE, K.	
Afiliação: 	RENATO GRILLO, UNESP Sorocaba; ZAIRA CLEMENTE, IB UNICAMP; JHONES LUIS DE OLIVEIRA, UNESP Sorocaba; ESTEFANIA VANGELIE RAMOS CAMPOS, UNESP Sorocaba; VICTOR COLOTTI CHALUPE; CLAUDIO MARTIN JONSSON, CNPMA; RENATA LIMA, UNISO; GABRIELA SANCHES, UNISO; CAROLINE SAYURI NISHISAKA, UNISO; ANDRE HENRIQUE ROSA, UNESP Sorocaba; KATHLEEN OEHLKE, Max Rubner-Institut.	
Título: 	Chitosan nanoparticles loaded the herbicide paraquat: the influence of the aquatic humic substances on the colloidal stability and toxicity.	
Ano de publicação: 	2015	
Fonte/Imprenta: 	Journal of Hazardous Materials, Amsterdam, v. 286, p. 562?572, 2015.	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Polymeric nanoparticles have been developed for several applications, among them as carrier system of pesticides. However, few studies have investigated the fate of these materials in the environment in relation to colloidal stability and toxicity. In nature, humic substances are the main agents responsible for complexation with metals and organic compounds, as well as responsible for the dynamics of these nanoparticles in aquatic and terrestrial environments. In this context, the evaluation of the influence of aquatic humic substances (AHS) on the colloidal stability and toxicity of polymeric nanoparticles of chitosan/tripolyphosphate with or without paraquat was performed. In this study, the nanoparticles were prepared by the ionic gelation method and characterized by size distribution measurements (DLS and NTA), zeta potential, infrared and fluorescence spectroscopy. Allium cepa genotoxicity studies and ecotoxicity assays with the alga Pseudokirchneriella subcapitata were used to investigate the effect of aquatic humic substances (AHS) on the toxicity of this delivery system. No changes were observed in the physical?chemical stability of the nanoparticles due to the presence of AHS using DLS and NTA techniques. However some evidence of interaction between the nanoparticles and AHS was observed by infrared and fluorescence spectroscopies. The ecotoxicity and genotoxicity assays showed that humic substances can decrease the toxic effects of nanoparticles containing paraquat. These results are interesting because they are important for understanding the interaction of these nanostructured carrier systems with species present in aquatic ecosystems such as humic substances, and in this way, opening new perspectives for studies on the dynamics of these carrier systems in the ecosystem.	
Palavras-Chave: 	Nanopartículas; Natural organic matter; Polymeric nanoparticles; Quitosana.	
Thesagro: 	Agrotóxico; Herbicida; Impacto ambiental; Matéria orgânica; Paraquat; Toxidez.	
Thesaurus Nal: 	Chitosan; Herbicides; Nanoparticles; Toxicity.	
Categoria do assunto: 	H Saúde e Patologia	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (14774-1) - UPC - AP - DD -  -  -  - DIS