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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Deposition of CdTe quantum dots on microfluidic paper chips for rapid fluorescence detection of pesticide 2,4-D
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Deposition of CdTe quantum dots on microfluidic paper chips for rapid fluorescence detection of pesticide 2,4-D

机译：在微流体纸屑上沉积CDTE量子点，用于农药的快速荧光检测2,4-D.

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摘要

Rapid detection of pesticides in fruits is an ongoing challenge. The objective of the present study was to develop novel fluorescent microfluidic paper chips for specific recognition and sensitive detection of the pesticide 2,4-D through the 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 resultant imprinted paper chips were effectively characterized, and they exhibited ideal ordered spatial network structure, chemical stability, and fluorescence property. The paper@QDs@MIPs showed that 2,4-D binding significantly reduced the fluorescence intensity within less than 18 min, and it achieved satisfactory linearity in the range of 0.83-100 M and 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 three concentration levels ranged within 94.2-107.0%, with a relative standard deviation of less than 5.9%. Collectively, the device provided an effective platform for rapid recognition, convenience, and detection of trace food pollutants in complex matrices, thereby ensuring food safety and further promoting surface imprinting studies.
机译：快速检测水果中的农药是一个持续的挑战。本研究的目的是开发新的荧光微流体纸屑，用于通过电子传递诱导的荧光猝灭机构对农药2,4-D进行特异性识别和敏感检测。将CDTE量子点（QDS）沉积在纤维素纸（基材）上，得到压印纸屑（QD @ MIPS的纸张）。该方法允许将分子印迹荧光传感器从液相转移到固相（纸基）以快速和便携的分析。得到的印迹纸屑有效地表征，它们表现出理想的有序的空间网络结构，化学稳定性和荧光性。本文@QDS @ MIPS显示，2,4-D结合在小于18分钟内显着降低荧光强度，并且它在0.83-100μm和90nm的可检测性的范围内实现了令人满意的线性度。显示了相对于其类似物的2,4-D的识别特异性，印迹因子为2.13。此外，在三个浓度水平的尖刺豆芽的回收率范围内的94.2-107.0％内，相对标准偏差小于5.9％。集体，该装置提供了一种有效的平台，用于快速识别，方便和检测复杂矩阵中的痕量食品污染物，从而确保食品安全和进一步促进表面积压印研究。

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