Data/hora: 20/09/2024 21:20:15

Biblioteca(s): 	Embrapa Amazônia Oriental.	
Data corrente: 	08/09/2017	
Data da última atualização: 	20/05/2022	
Autoria: 	DUARTE JUNIOR, A. P.; TAVARES, E. J. M.; ALVES, T. V. G.; MOURA, M. R. de; COSTA, C. E. F. da; SILVA JÚNIOR, J. O. C.; COSTA, R. M. R.	
Afiliação: 	Anivaldo Pereira Duarte Junior, UFPA; ERALDO JOSE MADUREIRA TAVARES, CPATU; Taís Vanessa Gabbay Alves, UFPA; Márcia Regina de Moura, UNESP; Carlos Emmerson Ferreira da Costa, UFPA; José Otávio Carréra Silva Júnior, UFPA; Roseane Maria Ribeiro Costa, UFPA.	
Título: 	Chitosan nanoparticles as a modified diclofenac drug release system.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Journal of Nanoparticle Research, v. 19, n. 8, article 274, 2017.	
DOI: 	10.1007/s11051-017-3968-6	
Idioma: 	Inglês	
Conteúdo: 	This study evaluated a modified nanostructured release system employing diclofenac as a drug model. Biodegradable chitosan nanoparticles were prepared with chitosan concentrations between 0.5 and 0.8% ( w/ v) by template polymerization method using methacrylic acid in aqueous solution. Chitosan-poly(methacrylic acid) (CS-PMAA) nanoparticles showed uniform size around 50?100 nm, homogeneous morphology, and spherical shape. Raw material and chitosan nanoparticles were characterized by thermal analysis, Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM), confirming the interaction between chitosan and methacrylic acid during nanoparticles preparation. Diclofenac sorption on the chitosan nanoparticles surface was achieved by incubation in water/ethanol (1:1) drug solution in concentrations of 0.5 and 0.8 mg/mL. The diclofenac amount sorbed per gram of CS-PMAA nanoparticles, when in a 0.5 mg/mL sodium diclofenac solution, was as follows: 12.93, 15, 20.87, and 29.63 mg/g for CS-PMAA nanoparticles 0.5, 0.6, 0.7, and 0.8% ( w/ v), respectively. When a 0.8 mg/mL sodium diclofenac solution was used, higher sorption efficiencies were obtained: For CS-PMAA nanoparticles with chitosan concentrations of 0.5, 0.6, 0.7, and 0.8% ( w/ v), the sorption efficiencies were 33.39, 49.58, 55.23, and 67.2 mg/g, respectively. Diclofenac sorption kinetics followed a second-order kinetics. Drug release from nanoparticles occurred in a period of up to 48 h and obeyed Korsmeyer-Peppas model, which was characterized mainly by Fickian diffusion transport.	
Palavras-Chave: 	Biopolímero; Nanopartícula; Nanotecnologia; Quitosana.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
Registro original: 	Embrapa Amazônia Oriental (CPATU)	
Exemplares: 	CPATU - (54086-1) - UPC - AP - DD -  -  -  - DIS