一种新型磁性荧光纳米材料的制备与应用分析

摘要

目的 制备一种新型的磁性荧光纳米粒子,对其进行表征,并分析其在生物以及医药领域的应用.方法 采用化学合成的方法制备出了磁性荧光纳米粒(Fe3 O4@PEI@RN).对制备的粒子测定其主要成分的含量;利用动态光散射分析对其进行粒径分析;通过荧光分析测定pH值对其荧光性质的影响;考察常见金属离子、蛋白质及DNA对其干扰情况.结果 对Fe3 O4@PEI@RN含量的测定结果显示,铁(Fe)的含量为14.1 mg/mL,罗丹明B含量7.6 mg/mL,萘酰亚胺的含量为94.8 mg/mL;利用动态光散射分析测得磁性荧光纳米粒的平均粒径为224 nm;通过荧光分析发现Fe3O4@PEI@RN在532 nm和574 nm波长下的荧光比值F有pH值敏感性,pKa为6.73;浓度为5×10-6mol/L的常见金属离子对其荧光测定没有干扰;当蛋白质浓度小于14 mg/mL,DNA浓度小于20 mg/mL时亦不干扰其测定.结论 成功制备出新型磁性荧光纳米材料,其良好的荧光性能显示出其在生物医药领域的巨大潜力.%Objective To prepare a new type of magnetic fluorescent nanoparticles and characterize them and analyze their applications in the field of biology and medicine.Methods In this paper,magnetic fluorescent nanoparticles-Fe3O4@PEI@RN were prepared by chemical synthesis.The content of the main components of the prepared particles was measured.The particles' size was analyzed by dynamic light scattering analysis,the effect of pH on the fluorescence properties was measured by fluorescence analysis,and some common metal ions,proteins and DNA were investigated whether they would interfere the particles'properties.Results The content of Fe3O4@PEI@RN showed that the autom of Fe was 14.1 mg/mL,rhodamine B was 7.6 mg/mL and napH thalimide was 94.8 mg/mL.The dynamic light scattered that the average particle diameter of the magnetic fluorescent nanoparticles was 224 nm.Fluorescence analysis showed that the fluorescence ratio F of Fe3O4@PEI@RN at 532 nm and 574 nm were pH-sensitive with a pKa of 6.73.When the concentration of common metal ions was 5 × 10-6,they did not change their fluorescence determinations,and when the protein concentration was less than 14 mg/mL and the DNA concentration was less than 20 mg/mL,they did not interfere with their determinations.Conclusion A new type of magnetic fluorescent nanomaterials is successfully prepared.Its good fluorescence shows it has great potential in the field of biomedicine.