Dextran-Coated Antiferromagnetic MnO Nanoparticles for aT1-MRI Contrast Agent with High Colloidal Stability
| Autor: | Herbert R. Neves, Carlos Ernesto Garrido Salmon, Jeam Haroldo Oliveira Barbosa, Rafael A. Bini, Laudemir Carlos Varanda |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
MRI contrast agent Simulated body fluid Thermal decomposition Dispersity Nanoparticle NANOPARTÍCULAS 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Colloid Chemical engineering Phase (matter) General Materials Science Surface charge 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0934-0866 |
| DOI: | 10.1002/ppsc.201500251 |
| Popis: | A simple approach to synthesize carboxymethyl dextran-coated MnO nanoparticles (CMDex-MnONPs) with high colloidal stability in physiological saline solutions is described here for potential applications as a magnetic resonance imaging (MRI) T1 contrast agent. The thermal decomposition methodology is used to produce uniform MnONPs with an average size of around 20 nm, and its hydrophobic surface is modified with CMDex molecules, conferring hydrophilic properties. After CMDex coating, the nanoparticle presents high colloidal stability in concentrations ranging from 10 to 50 μg mL−1, average hydrodynamic size (Z-average) of 130 nm, polydispersity degree of ≈12%, and negative surface charge in both simulated body fluid solutions and pure water with zeta-potential of –20 and –40 mV, respectively. The CMDex-MnONPs with 20 nm show antiferromagnetic behavior at room temperature, and the magnetic properties are found to be strongly dependent of the nanoparticle size, increasing the contribution of the ferromagnetic Mn3O4 phase with decreasing size for nanoparticles about 3 nm. Cytotoxicity evaluation in cancerous and noncancerous cells in the range of 5.0–50.0 μg mL−1 shows low toxicity for cancerous cells and lack of the same for healthy cells lines. Related to the magnetic properties, CMDex-MnONP presents significant r1 relaxivity and low r2/r1 relaxivity ratio. The results suggest that these nanoparticles display characteristics for potential applications as an MRI T1 contrast agent. |
| Databáze: | OpenAIRE |
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