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Flash nanoprecipitation with Gd(III)-based metallosurfactants to fabricate polylactic acid nanoparticles as highly efficient contrast agents for magnetic resonance imaging.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-06-15 , DOI: 10.1002/asia.202000624
Kehan Xu 1 , Mingwei Wang 2 , Weijun Tang 3 , Yun Ding 1 , Aiguo Hu 1
Affiliation  

Polylactic acid (PLA) nanoparticles coated with Gd(III)‐based metallosurfactants (MS) are prepared using a simple and rapid one‐step method, flash nanoprecipitation (FNP), for magnetic resonance imaging (MRI) applications. By co‐assembling the Gd(III)‐based MS and an amphiphilic polymer, methoxy poly(ethylene glycol)‐b‐poly(ϵ‐caprolactone) (mPEG‐b‐PCL), PLA cores were rapidly encapsulated to form biocompatible T1 contrast agents with tunable particle size and narrow size distribution. The hydrophobic property of Gd(III)‐based MS were finely tuned to achieve their high loading efficiency. The size of the nanoparticles was easily controlled by tuning the stream velocity, Reynolds number and the amount of the amphiphilic block copolymer during the FNP process. Under the optimized condition, the relaxivity of the nanoparticles was achieved up to 35.39 mM−1 s−1 (at 1.5 T), which is over 8 times of clinically used MRI contrast agents, demonstrating the potential application for MR imaging.

中文翻译:

使用基于Gd(III)的金属表面活性剂进行快速纳米沉淀,以制造聚乳酸纳米颗粒,作为用于磁共振成像的高效造影剂。

涂有基于Gd(III)的金属表面活性剂(MS)的聚乳酸(PLA)纳米粒子是使用简单快速的一步方法即闪速纳米沉淀(FNP)制备的,用于磁共振成像(MRI)应用。通过共组装的Gd(III)基MS和两亲聚合物,甲氧基聚(乙二醇) -嵌段-聚(ε -己内酯)(的mPEG- b -PCL),PLA芯迅速封装以形成生物相容性Ť 1粒度可调且粒度分布窄的造影剂。对基于Gd(III)的MS的疏水性进行了微调,以实现其高负载效率。通过调节FNP过程中的流速,雷诺数和两亲性嵌段共聚物的量,可以轻松控制纳米颗粒的大小。在优化条件下,纳米粒子的弛豫性达到35.39 mM -1  s -1(在1.5 T下),是临床使用的MRI造影剂的8倍以上,证明了其在MR成像中的潜在应用。
更新日期:2020-08-18
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