New naphthalimide modified polyethylenimine nanoparticles as fluorescent probe for DNA detection
作者:Shucai Liang、Hui Yu、Jin Xiang、Wang Yang、Xiaohui Chen、Yanbin Liu、Chen Gao、Guoping Yan
DOI:10.1016/j.saa.2012.05.058
日期:2012.11
A new naphthalimide modified polyethylenimine (PEI) nanoparticles (called NPEI-NPs) was synthesized and applied as fluorescent probe for rapid, selective and sensitive fluorometric detection of trace DNA. The synthesis involved the covalent modification of PEI with 4-butylamino-N-carboxymethyl-1,8-naphthalimide(BACMN) for getting amphiphilic polymer. Then the amphiphilic polymer was self-assembled
合成了一种新型的萘二甲酰亚胺修饰的聚乙烯亚胺(PEI)纳米颗粒(称为NPEI-NPs),并将其用作荧光探针,用于快速,选择性和灵敏的痕量DNA荧光检测。合成过程涉及用4-丁基氨基-N-羧甲基-1,8-萘二甲酰亚胺(BACMN)对PEI进行共价修饰,从而获得两亲性聚合物。然后将两亲性聚合物在水中自组装,得到NPEI-NP。NPEI-NPs溶于水,并在545 nm发射荧光,并在460 nm激发。NPEI-NPs与DNA相互作用产生的荧光光谱表明,NPEI-NPs的荧光随着DNA的存在而增加。因此,开发了一种荧光增强方法来测定痕量鱼的精子DNA(fsDNA)和小牛胸腺DNA(ctDNA)。在最佳条件下 在fsDNA浓度范围为0.05-2.8μg/ mL和ctDNA浓度范围为0.08-3.0μg/ mL时,校准曲线呈线性关系。fsDNA和ctDNA的检出限分别为1.6 ng / mL和2.0 ng