Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 255, Issue -, Pages 1631-1639Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.08.177
Keywords
AuNCs immobilized paper; Hydride generation; Headspace-solid phase extraction; Zinc; Visual detection
Funding
- National Natural Science Foundation of China [21605108, 81603291]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [16kffk04]
- Key Lab of Process Analysis and Control of Sichuan Universities [2016001]
- Natural Science Foundation of Sichuan Province Department of Education [17ZB0354]
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A novel visual detection method was developed for the determination of zinc (Zn) in whole blood and cells using gold nanoclusters (AuNCs) immobilized paper. The detection of Zn was based on a headspace-solid phase extraction (HS-SPE), visible fluorescence from the AuNCs coated paper was quenched by ZnH2 generated from hydride generation (HG). The potential mechanism was investigated by using X-ray photoelectron spectroscopy (XPS) and Density Functional Theory (DFT). The selectivity was significantly increased because the zinc hydride was effectively separated from sample matrices by hydride generation. A limit of detection (LOD) of 3 mu gL(-1) Zn2+ and a relative standard deviation (RSD, n = 7) of 2% at a concentration of 50 mu gL(-1) of Zn2+ were obtained when using a commercial fluorescence spectrophotometer as the detector. In visual detection, as low as 20 mu gL(-1) of Zn2+ in biological samples can be easily discriminated from the blank with the naked eye. The proposed method retains several unique advantages, including straightforward, rapid, affordable and equipment-free for visual detection. (C) 2017 Elsevier B.V. All rights reserved.
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