Abstract
We developed a novel “turn off-on” sensor for human serum albumin (HSA) detection based on CuInZnS quantum dots (CIZS QDs). The photoluminescence (PL) of QDs can be “turned off” by Co(II) first. Because of the strong binding ability of HSA with Co2+, Co2+ can be removed from CIZS QDs with the addition of HSA. As a result, the PL of CIZS QDs probe can be “turned on” with an increased concentration of HSA over a wide range. The analyte HSA concentration had a proportional linear relationship with the recovered PL intensity of CIZS QDs. The detection limit for HSA was 4.5 × 10–8 mol L–1. The results indicated that the CIZS QDs- Co2+-BSA sensing system possessed higher sensitivity and better practicability for HSA detection.
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This work was financially supported by the National Natural Science Foundation of China (no. 21075050 and no. 21005029) and Youth Science Fund of Jilin Province (20140520081JH).
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Gui, W., Chen, X. & Ma, Q. A novel detection method of human serum albumin based on CuInZnS quantum dots-Co2+ sensing system. Anal Bioanal Chem 409, 3871–3876 (2017). https://doi.org/10.1007/s00216-017-0332-8
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DOI: https://doi.org/10.1007/s00216-017-0332-8