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首页> 外文期刊>Biomaterials >Lanthanide-DTPA grafted silica nanoparticles as bimodal-imaging contrast agents.
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Lanthanide-DTPA grafted silica nanoparticles as bimodal-imaging contrast agents.

机译:镧系元素-DTPA接枝的二氧化硅纳米颗粒作为双峰成像造影剂。

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The design and synthesis of a combined MRI-optical probe for bio-imaging are reported. The materials studied join the properties of lanthanide (Ln(3+)) complexes and nanoparticles (NPs), offering an excellent solution for bimodal imaging. The hybrid SiO(2)@APS/DTPA:Gd:Ln (Ln = Eu(3+) or Tb(3+)) (APS: 3-aminopropyltriethoxysilane, DTPA: diethylenetriamine pentaacetic acid) system increases the payload of the active magnetic centre (Gd(3+)) and introduces a Ln(3+) long-life excited state (Eu(3+): 0.35 +/- 0.02 ms, Tb(3+): 1.87 +/- 0.02 ms), with resistance to photobleaching and sharp emission bands. The Eu(3+) ions reside in a single low-symmetry site. Although the photoluminescence emission is not influenced by the simultaneous presence of Gd(3+) and Eu(3+), a moderate r(1) increase and a larger enhancement of r(2) are observed, particularly at high fields, due to susceptibility effects on r(2). The presence of Tb(3+) instead of Eu(3+) further raises r(1) but decreases r(2). These values are constant over a wide (5-13) pH range, indicating the paramagnetic NPs stability and absence of leaching. The uptake of NPs by living cells is fast and results in an intensity increase in the T(1)-weighted MRI images. The optical properties of the NPs in cellular pellets are also studied, confirming their potential as bimodal imaging agents.
机译:报道了用于生物成像的组合MRI光学探针的设计和合成。研究的材料结合了镧系元素(Ln(3+))配合物和纳米颗粒(NPs)的特性,为双峰成像提供了极好的解决方案。混合SiO(2)@ APS / DTPA:Gd:Ln(Ln = Eu(3+)或Tb(3+))(APS:3-氨丙基三乙氧基硅烷,DTPA:二亚乙基三胺五乙酸)系统增加了活性磁性的有效负载中心(Gd(3+))并引入Ln(3+)长寿命激发态(Eu(3+):0.35 +/- 0.02 ms,Tb(3+):1.87 +/- 0.02 ms),耐光漂白和清晰的发射带。 Eu(3+)离子位于单个低对称位点。尽管光致发光发射不受同时存在的Gd(3+)和Eu(3+)的影响,但由于存在以下原因,特别是在高场下,观察到r(1)的适度增加和r(2)的较大增强。对r(2)的敏感性。 Tb(3+)而不是Eu(3+)的存在进一步提高了r(1),但降低了r(2)。这些值在很宽的(5-13)pH范围内是恒定的,表明顺磁性NPs稳定且没有浸出。活细胞对NP的吸收很快,并导致T(1)加权MRI图像的强度增加。还研究了细胞团粒中NP的光学性质,证实了其作为双峰显像剂的潜力。

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