Synthesis of CdTe Quantum Dots-based Imprinting Fluorescent Nanosensor for Highly Specific and Sensitive Determination of Caffeic Acid in Apple Juices

Ruiqing Long; Te Li; Lihui Wu; Shuyun Shi

doi:10.2991/efood.k.190802.003

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Volume 1, Issue 2, April 2020, Pages 165 - 172

Synthesis of CdTe Quantum Dots-based Imprinting Fluorescent Nanosensor for Highly Specific and Sensitive Determination of Caffeic Acid in Apple Juices

Authors

Ruiqing Long¹, Te Li¹^{, 2}, Lihui Wu¹, Shuyun Shi¹^{, 2}^{, *}

¹College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China

²Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Central South University, Changsha 410083, P. R. China

^*Corresponding author. Email: shishuyun@126.com

Corresponding Author

Shuyun Shi

Received 30 May 2019, Accepted 12 June 2019, Available Online 23 August 2019.

DOI: 10.2991/efood.k.190802.003 How to use a DOI?
Keywords: CdTe quantum dots; molecularly imprinted polymers; sol–gel polymerization; fluorescence detection; caffeic acid; apple juice
Abstract: A facile method for the synthesis of molecularly imprinted polymers (MIPs) onto CdTe quantum dots (CdTe-QDs@MIPs) was successfully developed, and for the first time used as a sensitive fluorescent nanosensor for specific and rapid determination of caffeic acid (CA) in apple juices. Sol–gel polymerization was selected to fabricate hydrophilic MIPs layer using 3-(aminopropyl)triethoxysilane, tetraethyl orthosilicate, and CA as functional monomer, cross-linker and template, respectively. Under optimum experimental conditions, smaller CdTe-QDs@MIPs particles (48 nm) were synthesized with polymerization time at 2 min, which showed fast fluorescence quenching with response time at 3 min and high sensitivity with a limit of detection at 0.73 μg L⁻¹. The fluorescence intensity of CdTe-QDs@MIPs presented excellent linearity with the concentration of CA in the range from 2 to 100 μg L⁻¹ (R², 0.9980). The developed method showed good repeatability with batch-to-batch relative standard deviation at 3.31%, and excellent selectivity over structural analogues. The practicability of the as-prepared CdTe-QDs@MIPs was confirmed by the analysis of CA in apple juices with satisfactory recoveries from 93.3% to 108.3%, and precisions <2.1%. Results demonstrated that a rapid, selective, and sensitive fluorescent method was successfully developed to detect CA in food samples.
Copyright: © 2019 International Association of Dietetic Nutrition and Safety. Publishing services by Atlantis Press International B.V.
Open Access: This is an open access article distributed under the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/).

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Journal: eFood
Volume-Issue: 1 - 2
Pages: 165 - 172
Publication Date: 2019/08/23
ISSN (Online): 2666-3066
DOI: 10.2991/efood.k.190802.003 How to use a DOI?
Open Access: This is an open access article distributed under the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/).

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ris enw bib

TY  - JOUR
AU  - Ruiqing Long
AU  - Te Li
AU  - Lihui Wu
AU  - Shuyun Shi
PY  - 2019
DA  - 2019/08/23
TI  - Synthesis of CdTe Quantum Dots-based Imprinting Fluorescent Nanosensor for Highly Specific and Sensitive Determination of Caffeic Acid in Apple Juices
JO  - eFood
SP  - 165
EP  - 172
VL  - 1
IS  - 2
SN  - 2666-3066
UR  - https://doi.org/10.2991/efood.k.190802.003
DO  - 10.2991/efood.k.190802.003
ID  - Long2019
ER  -

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