A novel Apt-SERS platform for the determination of cardiac troponin I based on coral-like silver-modified magnetic substrate and BCA method

• Published in: Analytica chimica acta 2022-09, Vol.1225, p.340253-340253, Article 340253
• Main Authors: Lin, Chubing, Li, Lijun, Feng, Jun, Zhang, Yan, Guo, Heyuanxi, Lin, Xin, Li, Rui
• Format: Article
• Language: English
• Subjects: BCA method; Cardiac troponin I; Coral-like nano-sliver; Surface-enhanced Raman scattering
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2022.340253

As a kind of acute cardiovascular disease, acute myocardial infarction (AMI) endangers human's life and fitness seriously. The detection of cardiac troponin I (cTnI), a biomarker of AMI, is the key to early medical prognosis and treatment. Surface-enhanced Raman spectroscopy is viewed to be an effective approach for detection of low-concentration substances, and aptamers are regarded to be effective fragments to recognize proteins specifically. In this work, a magnetic nanoparticle substrate coated with coral-like nano-silver was prepared, and the aptamer-modified substrate Fe3O4@PEI/Ag NC-Apt was used as magnetic capture probe. Combined with BCA method and SERS detection technology, an Apt-SERS platform was successfully constructed and used for high sensitivity quantitative detection of protein. Taking cTnI as the target, the detection range of the proposed Apt-SERS platform was 0.001–100 ng mL−1, and the estimated detection of limit (LOD) was 0.23 pg mL−1. The recovery and relative standard deviations (RSD) of spiked experiment in human serum samples were 92–106% and 3.8–10.1%, respectively. The platform combining BCA method and SERS provides a high sensitivity and good reproducibility method for cTnI detection, which offers a new method for the specific detection and analysis of proteins. [Display omitted] •A novel coral-like silver-modified substrate Fe3O4@PEI/Ag NC with high Raman enhancement effect was developed for high-sensitivity detection of cTnI.•Combined with BCA method and SERS detection technology, a new Apt-SERS platform was successfully constructed and used for high-sensitivity quantitative detection of cTnI.•The detection range of the proposed Apt-SERS platform for cTnI was 0.001–100 ng mL−1, and the estimated detection of limit (LOD) was 0.23 pg mL−1.