Abstract
Simple and sensitive detection of cardiac biomarkers is of great significance for early diagnosis and prevention of acute myocardial infarction (AMI). Here, a ratiometric fluorescent nanohybrids probe (AuNCs-QDs) was synthesized through the coupling of bovine serum albumin-functionalized gold nanoclusters (AuNCs) with CdSe/ZnS quantum dots (QDs) to realize simple and sensitive detection of cardiac biomarker myoglobin (Mb). The AuNCs-QDs probe shows pink fluorescence under UV light, with two emission peaks at 468 nm and 630 nm belonging to QDs and AuNCs, respectively. Importantly, the presence of Mb caused fluorescence quenching of the blue-emitting QDs, thereby inhibiting the fluorescence resonance energy transfer (FRET) process between QDs and AuNCs, and reducing the fluorescence intensity ratio (F468/F630) of AuNCs-QDs probe effectively. As the concentration of Mb increases, the ratiometric fluorescent probe also exhibits a visible fluorescence color change. The detection limit was as low as 4.99 μg/mL, and the response of the probe to Mb showed a good linear relationship up to 0.52 mg/mL. Moreover, the probe has excellent specificity for Mb. Besides, the AuNCs-QDs has been applied to detect Mb of urine samples. More importantly, we also developed an AuNCs-QDs probe modified smartphone-aided paper-based strip for on-site monitoring of Mb. As far as we know, this is the first report of a smartphone-aided paper-based strip for on-site quick monitoring of Mb, which provides a useful approach for AMI biomarker monitoring and may can be extended to other medical diagnostics.
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Funding
This work was supported by National Natural Science Key Foundation of China (Project no. 12032007), Chongqing Talents (cstc2022ycjh-bgzxm0166), Chongqing Talents Liao Xiao-ling (CQYC20210302379), Natural Science Foundation General Project of Chongqing in China (CSTC2019JCYJ-msxmX0221), Science and Technology Research Program of Chongqing Municipal Education Commission (KJQN202101537), Chongqing Technology Innovation and Application Development Project (CSTC 2019JSCX-msxmX0231), the Open Foundation of Chongqing Key Laboratory of Nano-micro Composites and Devices and Postgraduate Science and Technology Innovation Program of Chongqing University of Science and Technology (YKJCX1920205).
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All authors contributed to the conception and design of the research. Zichen Xu: Conceptualization, Methodology, Investigation, Writing-original draft, Review & editing. Hedan Xu: Methodology, Investigation, Writing-review & editing. Honglian Duan: Writing–review & editing. Junjie Li: Review & editing. Xiao Hu:Review & editing. Guixue Wang: Funding acquisition, Review & editing. Yuanyuan Zhang: Funding acquisition, Supervision, Review & editing.
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Xu, Z., Xu, H., Duan, H. et al. Smartphone-Aided Fluorescence Detection of Cardiac Biomarker Myoglobin by a Ratiometric Fluorescent AuNCs-QDs Nanohybrids Probe with High Sensitivity. J Fluoresc 34, 179–190 (2024). https://doi.org/10.1007/s10895-023-03246-8
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DOI: https://doi.org/10.1007/s10895-023-03246-8