Abstract
Using the surface molecular imprinting technique, a thermo-sensitive molecularly imprinted fluorescent sensor was constructed for bovine hemoglobin (BHb) detection with the silanized carbon dots (CD@SiO2) as fluorescent signal, N-isopropylacrylamide as monomer sensitive to temperature, and BHb as template. The silanized carbon dots coated by the molecularly imprinted polymer (CD@SiO2@MIP) were characterized by high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, and fluorescence spectroscopy. Owing to the combination of the strong fluorescence sensitivity of CDs and the high selectivity of the molecular imprinting shell, the prepared sensor showed good recognition and detection performance to the target protein BHb, with a linear range of 0.31–1.55 μM and a detection limit of 1.55 μM. Furthermore, the sensor was utilized to detect the content of BHb in real urine with a recovery of 98.6–100.5%. The CD@SiO2@MIP sensors present a high potential for applications in the detection of BHb in biological systems.
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Funding
This study received financial supports from the National Natural Science Foundation of China (Nos. 21873026, 21573058, 21773059, 21303044).
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The informed consent was obtained from the healthy volunteer who provide urine sample for this study. All experiments in this study were approved by the Academic Ethics Committee of Henan Normal University, China, and have been performed in accordance with the ethical standards.
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Zhao, Y., Chen, Y., Fang, M. et al. Silanized carbon dot-based thermo-sensitive molecularly imprinted fluorescent sensor for bovine hemoglobin detection. Anal Bioanal Chem 412, 5811–5817 (2020). https://doi.org/10.1007/s00216-020-02803-5
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DOI: https://doi.org/10.1007/s00216-020-02803-5