| Texto completo | |
| Autor(es): |
Carvalho, Layde T.
;
Moraes, Rodolfo M.
;
Alves, Gizelda M.
;
Lacerda, Talita M.
;
Santos, Julio C.
;
Santos, Amilton M.
;
Medeiros, Simone F.
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | International Journal of Biological Macromolecules; v. 145, p. 11-pg., 2020-02-15. |
| Resumo | |
Chemical modification of natural polymers has been commonly employed for the development of new bio-based materials, aiming at adjusting specific properties such as solubility, biodegradability, thermal stability and mechanical behavior. Among all natural polymers, polysaccharides are promising materials, in which biodegradability, processability and bioreactivity make them suitable for biomedical applications. In this context, this work describes the synthesis and characterization of a novel amphiphilic pullulan-g-poly(epsilon-caprolactone) (Pull-g-PCL) graft copolymer. In a first step, pullulan was chemically modified with 2-bromopropionyl bromide to obtain bromo-functionalized pullulan (PullBr). Then, this precursor was modified with sodium azide, leading to azide pullulan (PullN(3)). In parallel, propargyl-terminated poly(epsilon-caprolactone) was prepared via ring-opening polymerization (ROP). These preliminary steps involved the synthesis of azide and alkyne compounds, capable of being linked together via alkyne-azide cycloaddition reaction catalyzed by copper (Cu (I)), which leads to Pull-g-PCL. The chemical structures of the polymers were assessed by Proton Nuclear Magnetic Resonance (H-1 NMR) and Fourier Transform Infrared (FTIR). (C) 2019 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 19/04269-0 - Avaliação do potencial de novas nanopartículas poliméricas como agentes de encapsulação e liberação simultânea de um agente fotossensibilizador e um princípio ativo quimioterápico |
| Beneficiário: | Simone de Fátima Medeiros Sampaio |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |