Low-noise fluorescent detection of cardiac troponin I in human serum based on surface acoustic wave separation  

作　　者：Xuan Chen Chuanyu Zhang Xianglian Liu Yangchao Dong Hao Meng Xianming Qin Zhuangde Jiang Xueyong Wei 

机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering,Xi'an Jiaotong University,Xian 710049,China [2]Department of Microbiology,School of Preclinical Medicine,Fourth Military Medical University,Xi'an 710032,China [3]The Second Affliated Hospital of Xi'an Jiaotong University,Xi'an 710004,China [4]School of Mechano-Electronic Engineering,Xidian University,Xi'an 710071,China

出　　处：《Microsystems & Nanoengineering》2023年第6期261-272,共12页微系统与纳米工程（英文）

基　　金：financially supported by the National Key R&D Program of China(2022YFC2406600,2020YFB2009000);Program for Innovation Team of Shaanxi Province(2021TD-23).

摘　　要：Acute myocardial infarction(AMI)is a life-threatening disease when sudden blockage of coronary artery occurs.As the most specific biomarker,cardiac troponin I(cTnI)is usually checked separately to diagnose or eliminate AMI,and achieving the accurate detection of cTnI is of great significance to patients'life and health.Compared with other methods,fluorescent detection has the advantages of simple operation,high sensitivity and wide applicability.However,due to the strong fluorescence interference of biological molecules in body fluids,it is often difficult to obtain high sensitivity.In order to solve this problem,in this study,surface acoustic wave separation is designed to purify the target to achieve more sensitive detection performance of fluorescent detection.Specifically,the interference of background noise is almost completely removed on a microfluidic chip by isolating microbeads through acoustic radiation force,on which the biomarkers are captured by the immobilized detection probe.And then,the concentration of cTnI in human serum is detected by the fluorescence intensity change of the isolated functionalized beads.By this way,the detection limit of our biosensor calculated by 3σ/K method is 44 pg/mL and 0.34 ng/mL in PBS buffer and human serum respectively.Finally,the reliability of this method has been validated by comparison with clinical tests from the nephelometric analyzer in hospital.

关 键 词：CARDIAC SEPARATION noise 

分 类 号：R542.22[医药卫生—心血管疾病]