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近红外染料功能化的磁性纳米粒子在多模式诊疗中的应用
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摘要
近红外染料功能化的磁性纳米粒子被广泛用于核磁共振成像,荧光成像,药物递送和磁热治疗等方面。然而对于长期实验来说,染料和磁性纳米粒子在水中的稳定性是一个亟待解决的问题。本文通过一种共沉淀的方法合成了在水环境中非常稳定的四氧化三铁纳米粒子,使用六氨基己酸作为连接剂,将IR820连接在四氧化三铁纳米粒子的表面得到IR820-CSQ-Fe。这种方式不仅能够使IR820在水中稳定至少三个月,也能使IR820在808 nm激光照射时的单线态氧产量加倍,这将极大提高它的光动力治疗效果。IR820-CSQ-Fe具有T_1和T_2加权核磁共振成像,光声成像和近红外荧光成像的效果,这将会使疾病诊断更加精确。以上的这些性质将使该纳米粒子广泛的应用于多模式诊疗一体化。
Near-infrared(NIR) dyes functionalized magnetic nanoparticles(MNPs) have been widely applied in magnetic resonance imaging(MRI), NIR fluorescence imaging, drug delivery, and magnetic hyperthermia. However, the stability of MNPs and NIR dyes in water is a key problem to be solved for long-term application. In this study, a kind of superstable iron oxide nanoparticles was synthesized by a facile way, which can be used as T1 and T2 weighted MRI contrast agent. IR820 was grafted onto the surface of nanoparticles by 6-amino hexanoic acid to form IR820-CSQ-Fe conjugates. Attached IR820 showed increased stability in water at least for three months and an enhanced ability of singlet oxygen production of almost double that of free dyes, which will improve its efficiency for photodynamic therapy. Meanwhile, the multispectral optoacoustic tomography(MSOT) and NIR imaging ability of IR820-CSQ-Fe will greatly increase the accuracy of disease detection. All of these features will broaden the application of this material as a multimodal theranostic platform.
引文
[1]Zhang,Z.;Wang,J.;Chen,C.Adv.Mater.2013,25:3869.
    [2]Fan,Q.;Cheng,K.;Hu,X.;Ma,X.;Zhang,R.;Yang,M.;Lu,X.;Xing,L.;Huang,W.;Gambhir,S.S.;Cheng,Z.J.Am.Chem.Soc.2014,136:15185.

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