Abstract
A facile colorimetric Pb2+ assay system has been developed based on the visible color change of gold nanoparticles (GNPs) modified with α2-microglobulin (α2M) protein. The α2M protein is a soluble and high-affinity receptor for Pb2+, which is well studied and regarded as the comparable positive control in Pb-binding protein researches. It was obtained through purifying recombinant protein from the expression of recombinant plasmids in Escherichia coli and was attached on GNPs to form GNPs-α2M sensor nanoparticles for detecting Pb2+, which has never been used for sensing Pb2+ in previous studies. When Pb2+ was introduced into the assay system, GNPs-α2M sensor nanoparticles can be triggered aggregation with the color change from pink to blue. The detection system exhibited good selectivity and sensitivity, which was attributed to the receptor specificity of α2M protein. Using this assay system, it can be distinguished 1.00 μM concentration of Pb2+ or more by naked eyes clearly. Furthermore, the UV-Vis absorbance ratio between 620 and 523 nm exhibited linearity relationship with the concentration of Pb2+ from 0.05 to 3 μM in assay system. In this research, GNPs-α2M sensor nanoparticles have highly specific capability to recognize Pb2+. The assay system constituted by GNPs-α2M sensor nanoparticles displays excellent convenience, selectivity, and sensitivity that provide promising potentials for on-site rapid test of Pb2+.
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Funding
This study was funded by the Program of the Department of Science & Technology of Liaoning Province (grant number 2019-MS-296), the Program of Liaoning Provincial Education Department (grant number 2019LJC14), the Program for Shenyang Young and Middle-aged Scientific and Technological Innovation Talents Support (grant number RC190481), and the Program for Young and Middle-aged teachers of Shenyang Pharmaceutical University (grant number ZQN2019002).
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Wang, C., Zhang, J. & Cui, Y. Facile detection of Pb2+ based on gold nanoparticles functionalized by specific receptor proteins. J Nanopart Res 22, 264 (2020). https://doi.org/10.1007/s11051-020-05000-8
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DOI: https://doi.org/10.1007/s11051-020-05000-8