Journal
TALANTA
Volume 208, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2019.120231
Keywords
Cadmium ion sensor; Smartphone-based colorimetric system; Gold nanoparticles; Water environment detecting
Categories
Funding
- National 973 Program of China [2015CB352101]
- Natural Science Foundation of China [81811530116]
- Major Research and Department Program of Zhejiang Province [2017C03032, 2019C03066]
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Cadmium is a heavy metal pollutant in environment with high toxicity that severely threats human health. A simple and sensitive method for rapid detection of cadmium ions in water sample is of significant importance. In this paper, a colorimetric method based on aptamer-functionalized gold nanoparticles (AuNPs) for specific recognition were proposed to realize Cd2+ detection. AuNPs aggregate in high-salt solutions because of the shielding of salt to electrostatic repulsion among AuNPs, while aptamers can strengthen the stability of AuNPs and avoid the aggregation. After adding Cd2+ ions, the specific interaction between aptamers and Cd2+ leads to a decrease of free aptamers, which weakens the stability of the AuNPs and results in the color change of the solution. The colorimetric change can be rapidly captured and analyzed by a self-developed smartphone-based colorimetric system (SBCS) within 10 min, which implements the quantitative detection of Cd2+. The results show that Cd2+ ions can be detected with high selectivity and sensitivity with a linear range of 2-20 mu g/L and a detection limit of 1.12 mu g/L. Compared with other methods, the proposed approach features high sensitivity, high simplicity, easy implementation and high throughout, which provides a promising means for in-situ determination of Cd2+ in practical applications.
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