Abstract
Thermo-responsive lysozyme/calcium alginate-g-poly-N-isopropylacrylamide nanohydrogels (Lys/CA-g-PNIPAAm NHs) were prepared from the self-assembly of Lys and sodium alginate-g-poly-N-isopropylacrylamide (SA-g-PNIPAAm) and the ionic cross-linking of CaCl2 in aqueous solution. The Lys/CA-g-PNIPAAm NHs were immobilized on the cleaned surface of a transducer to fabricate a Lys molecularly imprinted sensor (Lys@MIP NHs sensor), which can selectively rebind to Lys in a mixture of closely related compounds. The effects of temperature on the size and the morphology of the Lys/CA-g-PNIPAAm NHs, the removal of Lys templates, the rebinding of Lys targets, and the detection performance of the Lys@MIP NHs sensor were investigated by dynamic light scattering, transmission electron microscope, and differential pulse voltammetry measurements. Compared with other Lys sensors, the fabricated Lys@MIP NHs sensor exhibited the wide linear range from 1 × 10−9 to 1 × 10−3 mg·mL−1 at 30 °C and showed short analysis times, high accuracy, satisfactory selectivity, stability, repeatability, reproducibility, and practical application for Lys detection in urine sample.
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Funding
This work was financially supported by the Natural Science Foundation of Anhui Province (2108085ME154, 2108085J11), the University Natural Science Research Project of Anhui Province (KJ2019A0140), the China Postdoctoral Science Foundation (2021M691363), the Science Research Foundation of Anhui Polytechnic University (Xjky04201904, 2020YQQ015) and the National Natural Science Foundation Pre-research Project of Anhui Polytechnic University (2019yyzr09).
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Yang, X., Huo, C., Ji, Y. et al. A molecularly imprinted sensor based on thermo-responsive calcium alginate nanohydrogels for lysozyme detection. Colloid Polym Sci 301, 229–237 (2023). https://doi.org/10.1007/s00396-023-05062-9
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DOI: https://doi.org/10.1007/s00396-023-05062-9