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A three-dimensional CoNi-MOF nanosheet array-based immunosensor for sensitive monitoring of human chorionic gonadotropin with core–shell ZnNi-MOF@Nile Blue nanotags
Analyst ( IF 3.6 ) Pub Date : 2020-09-22 , DOI: 10.1039/d0an01648a
Wenbo Lu 1 , Zi-Ang Chen , Ming Wei , Xiaowei Cao , Xuping Sun
Affiliation  

A CoNi-based metal–organic framework (CoNi-MOF) nanosheet array is synthesized by the treatment of a CoNi layered double hydroxide nanosheet array on Ni foam with 3,5-diaminobenzoic acid. The CoNi-MOF nanosheet array with amino and carboxyl groups can be used to capture the human chorionic gonadotropin (HCG) primary antibody (HCG Ab1). Nile Blue decorated ZnNi-MOF (NB@ZnNi-MOF) spheres immobilized with HCG secondary antibodies (HCG Ab2) are used for signal amplification. When HCG exists in an analytical sample, a sandwich structure is formed and an electrochemical signal is produced. The analytical signal generated during the detection is caused by the conversion of Co(II) and Co(III) in the CoNi-MOF nanosheet array. The Nile Blue of the NB@ZnNi-MOF sphere, as a kind of redox-active species, is responsible for the electrochemical signal amplification in the immunosensor. On the basis of the above advantages, the HCG immunosensor exhibits a lower limit of detection (1.85 × 10−3 mIU mL−1) and a wide linear range from 0.005 mIU mL−1 to 250 mIU mL−1. Additionally, this immunosensor is used to quantitatively detect HCG in human blood serum and shows good correlations with the standard enzyme-linked immunosorbent assay (ELISA), providing a high value on clinical diagnosis.

中文翻译:

一种基于三维CoNi-MOF纳米片阵列的免疫传感器,用于灵敏监测具有核壳ZnNi-MOF@Nile Blue纳米标签的人绒毛膜促性腺激素

通过用 3,5-二氨基苯甲酸处理泡沫镍上的 CoNi 层状双氢氧化物纳米片阵列,合成了基于 CoNi 的金属有机框架 (CoNi-MOF) 纳米片阵列。具有氨基和羧基的 CoNi-MOF 纳米片阵列可用于捕获人绒毛膜促性腺激素 (HCG) 一抗 (HCG Ab1)。用 HCG 二抗 (HCG Ab2) 固定的尼罗蓝装饰 ZnNi-MOF (NB@ZnNi-MOF) 球用于信号放大。当分析样品中存在 HCG 时,会形成夹层结构并产生电化学信号。检测过程中产生的分析信号是由Co( II )和Co( III )的转化引起的) 在 CoNi-MOF 纳米片阵列中。NB@ZnNi-MOF球体的尼罗蓝作为一种氧化还原活性物质,负责免疫传感器中的电化学信号放大。基于上述优点,HCG免疫传感器表现出检测下限(1.85×10 -3 mIU mL -1 )和0.005 mIU mL -1至250 mIU mL -1的宽线性范围。此外,该免疫传感器用于定量检测人血清中的HCG,与标准的酶联免疫吸附试验(ELISA)具有良好的相关性,为临床诊断提供了很高的价值。
更新日期:2020-11-03
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