适体
脱氧核酶
检出限
生物传感器
化学
肌钙蛋白I
纳米技术
辣根过氧化物酶
血红素
胶体金
电极
纳米颗粒
材料科学
组合化学
色谱法
生物化学
酶
分子生物学
血红素
精神科
生物
心肌梗塞
心理学
物理化学
作者
Duanping Sun,Xiangan Lin,Jing Lü,Rui Wang,Zibin Luo,Xiange Lu,Zuanguang Chen,Luyong Zhang
标识
DOI:10.1016/j.bios.2019.111578
摘要
The sensitive and accurate detection of cardiac troponin I (cTnI) is critical for myocardial infarction diagnosis. In this work, a dual-aptamer-based electrochemical (EC) biosensor was designed for cTnI detection based on the DNA nanotetrahedron (NTH) capture probes and multifunctional hybrid nanoprobes. First, the NTH-based Tro4 aptamer probes were anchored on a screen printed gold electrode (SPGE) surface through the Au–S bond, providing an enhanced spatial dimension and accessibility for capturing cTnI. Then, the hybrid nanoprobes were fabricated by using magnetic Fe3O4 nanoparticles as nanocarriers to load a large amount of cTnI-specific Tro6 aptamer, natural horseradish peroxidase (HRP), HRP-mimicking [email protected] nanozymes and G-quadruplex/hemin DNAzyme. This signaling nanoprobes are capable of specifically recognizing the target cTnI based on the Tro6 aptamer and amplifying the signals to improve the detection sensitivity via enzymatic processes. We found the remarkable enhanced effect of EC signal to be attributed to the co-catalysis effect of hybrid nanozymes, HRP and DNAzyme. The target cTnI was sandwiched between the two types of aptamers (Tro4 and Tro6) on the electrode interface. Finally, this EC aptasensing platform exhibited great analytical performance with a wide dynamic range of 0.01–100 ng mL−1 and a low detection limit of 7.5 pg mL−1 for cTnI. The high selectivity, sensitivity and reliability of EC aptasensor can provide great potential in the clinic disease diagnostics.
科研通智能强力驱动
Strongly Powered by AbleSci AI