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CuInS2 quantum dots-based fluorescence turn off/on probe for detection of melamine.
Talanta. 2012 Nov 15; 101:368-73.T

Abstract

In this paper, a sensitive and simple method for the determination of melamine (MA) was developed based on the fluorescence changes of the water-soluble CuInS(2) quantum dots (QDs). The water-soluble CuInS(2) QDs capped by mercaptopropionic acid (MPA) was directly synthesized by hydrothermal method based on our previous report. The fluorescence emission of CuInS(2) QDs was quenched by the oxidation of the surface of the QDs with H(2)O(2), and the quenched fluorescence of CuInS(2) QDs could be recovered upon the addition of small amounts of MA, which might be due to the surface passivation of the CuInS(2) QDs by MA. The other amino acids such as glycine and lysine had no effect on the quenched fluorescence of CuInS(2) QDs. Under optimum conditions, there was a good linear relationship between the fluorescence intensity of CuInS(2) QDs and the concentration range of MA from 1.0×10(-8) to 1.0×10(-5) mol/L with a detection limit as low as 5 nM. The proposed method was successfully applied to detect trace MA in raw milk with satisfactory results. Compared with previous reports, the proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation.

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Authors+Show Affiliations

Liu S
Department of Analytical Chemistry, College of Chemistry, Jilin University, Qianwei Road 10, Changchun 130012, China.
Hu J
No affiliation info available
Zhang H
No affiliation info available
Su X
No affiliation info available

MeSH

AnimalsFluorescent DyesLimit of DetectionMicroscopy, Electron, TransmissionMilkQuantum DotsSpectrometry, FluorescenceTriazines

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23158336

Citation

Liu, Siyu, et al. "CuInS2 Quantum Dots-based Fluorescence Turn Off/on Probe for Detection of Melamine." Talanta, vol. 101, 2012, pp. 368-73.
Liu S, Hu J, Zhang H, et al. CuInS2 quantum dots-based fluorescence turn off/on probe for detection of melamine. Talanta. 2012;101:368-73.
Liu, S., Hu, J., Zhang, H., & Su, X. (2012). CuInS2 quantum dots-based fluorescence turn off/on probe for detection of melamine. Talanta, 101, 368-73. https://doi.org/10.1016/j.talanta.2012.09.043
Liu S, et al. CuInS2 Quantum Dots-based Fluorescence Turn Off/on Probe for Detection of Melamine. Talanta. 2012 Nov 15;101:368-73. PubMed PMID: 23158336.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - CuInS2 quantum dots-based fluorescence turn off/on probe for detection of melamine. AU - Liu,Siyu, AU - Hu,Junjie, AU - Zhang,Hao, AU - Su,Xingguang, Y1 - 2012/09/28/ PY - 2012/07/10/received PY - 2012/09/20/revised PY - 2012/09/22/accepted PY - 2012/11/20/entrez PY - 2012/11/20/pubmed PY - 2013/5/2/medline SP - 368 EP - 73 JF - Talanta JO - Talanta VL - 101 N2 - In this paper, a sensitive and simple method for the determination of melamine (MA) was developed based on the fluorescence changes of the water-soluble CuInS(2) quantum dots (QDs). The water-soluble CuInS(2) QDs capped by mercaptopropionic acid (MPA) was directly synthesized by hydrothermal method based on our previous report. The fluorescence emission of CuInS(2) QDs was quenched by the oxidation of the surface of the QDs with H(2)O(2), and the quenched fluorescence of CuInS(2) QDs could be recovered upon the addition of small amounts of MA, which might be due to the surface passivation of the CuInS(2) QDs by MA. The other amino acids such as glycine and lysine had no effect on the quenched fluorescence of CuInS(2) QDs. Under optimum conditions, there was a good linear relationship between the fluorescence intensity of CuInS(2) QDs and the concentration range of MA from 1.0×10(-8) to 1.0×10(-5) mol/L with a detection limit as low as 5 nM. The proposed method was successfully applied to detect trace MA in raw milk with satisfactory results. Compared with previous reports, the proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation. SN - 1873-3573 UR - https://www.unboundmedicine.com/medline/citation/23158336/CuInS2_quantum_dots_based_fluorescence_turn_off/on_probe_for_detection_of_melamine_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0039-9140(12)00799-0 DB - PRIME DP - Unbound Medicine ER -