Effects of histidine modification of chitosan microparticles on metal ion adsorption
ARTIGO
Inglês
Imbalances in metal ions (Cu2+, Fe3+, and Zn2+) augment oxidative stress, and can lead to amyloid-β (Aβ) peptide aggregation, a phenomenon that is associated with Alzheimer's disease (AD) progression. As such, the use of particles that can cross the blood-brain barrier (BBB) and chelate metals could...
Imbalances in metal ions (Cu2+, Fe3+, and Zn2+) augment oxidative stress, and can lead to amyloid-β (Aβ) peptide aggregation, a phenomenon that is associated with Alzheimer's disease (AD) progression. As such, the use of particles that can cross the blood-brain barrier (BBB) and chelate metals could potentially provide a therapy to restore ionic balance in AD. Herein, we functionalized chitosan microparticles (CM) with histidine (an amino acid that contains an imidazole group, therefore mimicking Aβ) to chelate Cu2+, Fe3+, and Zn2+. CM were prepared by spray-drying and and functionalized with histidine (CM-Histidine). The CM, before and after functionalization, and interacting with metal ions were characterized by scanning electron microscopy with energy dispersive spectroscopy, x-ray diffraction and potentiometric titration. The adsorption capacity of CM-Histidine increased for Cu2+ and decreased for Zn2+ and Fe3+, when compared to unmodified CM. However, the adsorption kinetics for Cu2+ ions was lower for CM-histidine, than for CM, and the reverse was observed for Zn2+ and Fe3+. External mass resistance was the major factor that defined the mass transfer mechanism onto the active sites of CM-histidine. Diffusional effects were more relevant for Zn2+ and Fe3+ in the sorption process than for Cu2+
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
88882.151600/2017-01
Fechado
Effects of histidine modification of chitosan microparticles on metal ion adsorption
Effects of histidine modification of chitosan microparticles on metal ion adsorption
Fontes
Reactive and functional polymers Vol. 154 (2020), n. art. 104694 |