Journal
BIOSENSORS & BIOELECTRONICS
Volume 47, Issue -, Pages 379-384Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.03.055
Keywords
CuInS2 QDs; Near-infrared fluorescent probe; Fluorescence quenching; Dopamine; 3-aminophenyl boronic acid; Vicinal diols
Categories
Funding
- National Natural Science Foundation of China [20875036, 21075050]
- science and technology development project of Jilin province, China [20110334]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0911472] Funding Source: National Science Foundation
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Water-soluble CuInS2 ternary quantum dots (QDs) capped by mercaptopropionic acid were directly synthesized in aqueous solution. Consequently, the CuInS2 QDs were covalently linked to 3-aminophenyl boronic acid molecules to form the 3-aminophenyl boronic acid-functionalized CuInS2 QDs (F-CuInS2 QDs). The F-CuInS2 QDs had a fairly symmetric fluorescence emission centered at 736 nm that was in the near-infrared region (NIR). The F-CuInS2 QDs containing boronic acid functional groups were reactive toward vicinal diols to form five- or six-member cyclic esters in an alkaline aqueous solution. The reaction would cause the fluorescence quenching, which could be used as a fluorescence probe for the determination of dopamine (DA). This assay could also probe other vicinal diols such as catechol, pyrogallol, and gallate, based on the fluorescence quenching of the F-CuInS2 QDs, and this assay was nearly unaffected by other phenol compounds such as phenol, resorcinol, and hydroquinone without the vicinal diol structures. The developed F-CuInS2 QDs were applied to the detection of DA in human serum samples with satisfactory results. Therefore, this experment provided a simple and sensitve NIR fluorescence probe for the detection of DA, catechol, pyrogallol, and gallate. (C) 2013 Elsevier B.V. All rights reserved.
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