Functionalization of iron oxide nanoparticles with a versatile epoxy amine linker
作者:Michael Nickels、Jingping Xie、Jared Cobb、John C. Gore、Wellington Pham
DOI:10.1039/c0jm00808g
日期:——
A synthetically diverse linker molecule consisting of both a terminal epoxide and a terminal amine has been synthesized and shown to have the desired reactivity. Proof of principle experimentation showed that the prepared linker molecule possessed the ability to be reactive towards dextran coated iron nanoparticles, essentially converting the surface alcohols to amines with an efficiency on average of 50 linkers per nanoparticle. Once the surface of the nanoparticles had been functionalized, the iron nanoparticles were subsequently functionalized with both folic acid and fluorescein isothiocyanate, with an average efficiency of 20 and 3 molecules per nanoparticle, respectively. The labeled nanoparticles were then incubated with both folate receptor positive and negative cell lines, which showed a preferential accumulation of the particles in the receptor positive cell line. In addition to the fluorescence based assays, accumulation of the nanoparticles was demonstrated using T2-weighted MRI imaging, which showed that the iron core of the nanoparticle was present within the desired cell line. Overall, this linker has shown the ability to functionalize the surface of nanoparticles and can theoretically be used to label a wide variety of other targeting agents or imaging agents for in vivo therapies or diagnostics.
我们合成了一种由末端环氧化物和末端胺组成的、合成方法多样的连接分子,并证明它具有所需的反应活性。原理验证实验表明,所制备的连接剂分子能够对葡聚糖包覆的铁纳米粒子产生反应,基本上能将表面醇转化为胺,平均每个纳米粒子能产生 50 个连接剂。纳米颗粒表面功能化后,再用叶酸和异硫氰酸荧光素对纳米铁颗粒进行功能化,每个纳米颗粒的平均效率分别为 20 个和 3 个分子。然后将标记的纳米粒子与叶酸受体阳性和阴性细胞系进行孵育,结果表明粒子在受体阳性细胞系中优先聚集。除了基于荧光的检测方法外,纳米粒子的积累还通过 T2 加权核磁共振成像进行了证明,该成像显示纳米粒子的铁核存在于所需的细胞系中。总之,这种连接剂显示了纳米粒子表面功能化的能力,理论上可用于标记各种其他靶向药剂或成像药剂,以进行体内治疗或诊断。