Compact zwitterion-coated iron oxide nanoparticles for biological applications.

Compact zwitterion-coated iron oxide nanoparticles for biological applications.
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DOI:
10.1021/nl202721q
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发表时间:
2012-01-11
期刊:
影响因子:
10.8
通讯作者:
Bawendi MG
Bawendi MG
中科院分区:
材料科学1区
文献类型:
--
作者:
Wei H;Insin N;Lee J;Han HS;Cordero JM;Liu W;Bawendi MG

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超顺磁性氧化铁纳米颗粒(SPION)在各种生物医学应用中的潜力,包括磁共振成像(MRI),传感和药物递送,需要它们的表面衍生为亲水性和生物相容性。我们在这里报告的设计和合成的一个紧凑的和水溶性的两性离子多巴胺磺酸盐(ZDS)配体具有很强的结合亲和力SPION。配体交换后,ZDS包被的SPION表现出小的流体动力学直径(HD),以及相对于时间、pH和盐度的稳定性。此外,发现小ZDS包被的SPION对血清蛋白的非特异性亲和力降低(与带负电荷的SPION相比);链霉亲和素/染料功能化的SPION具有生物活性,因此特异性靶向生物素受体。
The potential of superparamagnetic iron oxide nanoparticles (SPIONs) in various biomedical applications, including magnetic resonance imaging (MRI), sensing, and drug delivery, requires that their surface be derivatized to be hydrophilic and biocompatible. We report here the design and synthesis of a compact and water-soluble zwitterionic dopamine sulfonate (ZDS) ligand with strong binding affinity to SPIONs. After ligand exchange, the ZDS coated SPIONs exhibit small hydrodynamic diameters (HD), and stability with respect to time, pH, and salinity. Furthermore, small ZDS coated SPIONs were found to have a reduced non-specific affinity (compared to negatively charged SPIONs) towards serum proteins; streptavidin/dye functionalized SPIONs were bioactive and thus specifically targeted biotin receptors.
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