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3-Aminophenylboronic Acid-Functionalized CuInS2 Quantum Dots as a Near-Infrared Fluorescence Probe for the Detection of Dicyandiamide

3-Aminophenylboronic Acid-Functionalized CuInS2 Quantum Dots as a Near-Infrared Fluorescence Probe for the Detection of Dicyandiamide

Siyu Liu, Shu Pang, Hui Huang, Xingguang Su

Analyst. 2014 Nov 21;139(22):5852-7.

PMID: 25221790

Abstract:

In this paper, a simple and highly selective method for the determination of dicyandiamide (DCD) was developed based on the fluorescence quenching of functionalized CuInS2 quantum dots (QDs). Water-soluble CuInS2 QDs, capped by mercaptopropionic acid, were directly synthesized in aqueous solution and then covalently linked to 3-aminophenylboronic acid molecules to form the 3-aminophenylboronic acid-functionalized CuInS2 QDs (F-CuInS2 QDs) that had a fairly symmetric fluorescence emission centered at 736 nm. Based on the cyclization of the guanidine group of DCD with 2,3-butanedione and 3-aminophenylboronic acid, the fluorescence of the F-CuInS2 QDs is quenched by DCD in the presence of 2,3-butanedione. This method effectively distinguishes DCD from other amino acids and nitrogen pollutants, such as melamine, in real milk samples. Under optimum conditions, there was a good linear relationship between the fluorescence intensity of F-CuInS2 QDs and the concentration of DCD in the range of 2.0 × 10(-6) to 2.0 × 10(-3) mol L(-1), with a detection limit of 0.6 μmol L(-1).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP30418598	3-Aminophenylboronic acid		30418-59-8	Price

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