检出限
材料科学
生物传感器
分子印迹聚合物
线性范围
微流控
电化学
组合化学
色谱法
纳米技术
化学
电极
生物化学
选择性
催化作用
物理化学
作者
Xiaolu Sun,Yannan Jian,Wei He,Shenguang Ge,Mei Yan,Jinghua Yu
标识
DOI:10.1021/acsami.9b02005
摘要
In this work, we proposed a strategy that combined molecularly imprinted polymers (MIPs) and hybridization chain reaction into microfluidic paper-based analytical devices for ultrasensitive detection of target glycoprotein ovalbumin (OVA). During the fabrication, Au nanorods with a large surface area and superior conductibility were grown on paper cellulosic fiber as a matrix to introduce a boronate affinity sandwich assay. The composite of MIPs including 4-mercaptophenylboronic acid (MPBA) was able to capture target glycoprotein OVA. SiO2@Au nanocomposites labeled MPBA and cerium dioxide (CeO2)-modified nicked DNA double-strand polymers (SiO2@Au/dsDNA/CeO2) as a signal tag were captured into the surface of the electrode in the presence of OVA. An electrochemical signal was generated by using nanoceria as redox-active catalytic amplifiers in the presence of 1-naphthol in electrochemical assays. As a result, the electrochemical assay was fabricated and could be applied in the detection of OVA in the wide linear range of 1 pg/mL to 1000 ng/mL with a relatively low detection limit of 0.87 pg/mL (S/N = 3). The results indicated that the proposed platform possessed potential applications in clinical diagnosis and other related fields.
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