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Deposition of CdTe quantum dots in microfluidic paper chips for rapid fluorescent detection of pesticide 2, 4-D

Abstract

Rapid detection of pesticides in fruits is an ongoing challenge. The objective of the present study was to develop a novel fluorescent microfluidic paper chips for specific recognition and sensitive detection of pesticide 2, 4-D through electron-transfer-induced fluorescence quenching mechanism. CdTe quantum dots (QDs) were deposited onto cellulose paper base material to yield imprinted paper chips (paper@QDs@MIPs). This method allows the transferability of the molecularly imprinted fluorescence sensor from the liquid phase to the solid phase paper base for rapid and portable analysis. The resulting imprinted paper chips were well characterized and showed ideal ordered spatial network structure, chemical stability and fluorescence property. The paper@QDs@MIPs showed 2, 4-D binding significantly reduced the fluorescent intensity within less than 18 min, and achieved a satisfactory linearity in the range of 0.83–100 µM and a high detectability of 90 nM. The recognition specificity for 2, 4-D relative to its analogues was shown, and the imprinting factor was 2.13. In addition, the recoveries of the spiked bean sprouts at the three concentration levels were ranging from 94.2−107.0%, with a relative standard deviation less than 5.9%. Collectively, the device provided an effective platform for rapid recognition, convenient and detection of trace food pollute in complex matrices, thereby ensuring food safety and further promoting surface imprinting researches.

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Publication details

The article was received on 25 Oct 2018, accepted on 01 Dec 2018 and first published on 03 Dec 2018


Article type: Paper
DOI: 10.1039/C8AN02051E
Citation: Analyst, 2018, Accepted Manuscript
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    Deposition of CdTe quantum dots in microfluidic paper chips for rapid fluorescent detection of pesticide 2, 4-D

    Z. Zhang, X. Ma, M. Jia, B. Li, J. Rong and X. Yang, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN02051E

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