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首页> 外文期刊>New Journal of Chemistry >Fabrication of sensitive silver-decorated cotton swabs for SERS quantitative detection of mixed pesticide residues in bitter gourds
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Fabrication of sensitive silver-decorated cotton swabs for SERS quantitative detection of mixed pesticide residues in bitter gourds

机译：敏感的银色装饰棉拭子的制造，为SERS定量检测苦葫芦混合农药残留量

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摘要

This study developed a simple, efficient and environmentally friendly fabrication method for surface-enhanced Raman spectroscopy (SERS) wipers for the rapid detection of individual and mixed pesticide residues in real samples. Non-toxic NaCl was used to overcome the electrostatic repulsion between cotton swabs and AgNPs in the decorating process. Cotton swabs containing NaCl molecules were immersed in a silver colloid to synthesize a silver-decorated cotton swab (SERS wiper). The fabrication conditions were optimized to improve the performance of the SERS wiper. Under optimal conditions, AgNPs were evenly and densely distributed on cotton swabs within 10 min of the synthesis process. Raman reporter molecules (Rhodamine 6G) were tested and good results were obtained: sensitivity was 2 x 10(-9) M, RSDs were within 7.5%, showing good reproducibility and uniformity, and the storage life reached 32 days. Thiabendazole (TBZ), thiram, and their mixture in bitter gourds were successfully detected using the "wipe sampling-detection" method coupled with the SERS wipers. The detection limits of TBZ and thiram were 1 ng cm(-2). Multiple linear regression (MLR) and leave-one-out cross-validation methods were employed for quantitative analysis. The linear correlation coefficients of the predicted results and reference concentrations of individual and mixed pesticide residues in bitter gourds were all above 0.99, and the RMSEs were within 7 ng cm(-2). These results indicate that the SERS wipers combined with MLR models could accurately and quantitatively detect individual and mixed pesticide residues in real samples.
机译：本研究开发了一种简单，高效且环保的制造方法，用于表面增强拉曼光谱（SERS）刮水器，用于快速检测真实样品中的个体和混合农药残留物。非毒性NaCl用于克服棉拭子和装饰过程中的AgNP之间的静电排斥。将含有NaCl分子的棉拭子浸入银胶体中以合成银装饰的棉签（Sers Wiper）。制造条件被优化以改善SERS刮水器的性能。在最佳条件下，在合成过程的10分钟内均匀且均匀地分布在棉拭子上。测试Raman报告分子（Rhodamine 6G）获得了良好的结果：敏感性为2×10（-9）m，RSD在7.5％以内，显示出良好的再现性和均匀性，储存寿命达到32天。使用与SERS刮水器连接的“擦拭采样检测”方法成功地检测到噻吩咐葡萄唑（TBZ），THIRAM和它们的混合物。 TBZ和Thiram的检测限为1ng cm（-2）。采用多元线性回归（MLR）和留下一次交叉验证方法进行定量分析。预测结果的线性相关系数和苦孔中的个体和混合农药残留物的参考浓度全部高于0.99，并且RMS在7ng cm（-2）内。这些结果表明，SERS刮水器与MLR模型结合可以准确地和定量地检测真实样品中的个体和混合的农药残留物。

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  • 来源
    《New Journal of Chemistry》 |2020年第29期|共6页
  • 作者

    Kong Lili; Huang Meizhen; Chen Jie; Lin Mengshi;

  • 作者单位

    Shanghai Jiao Tong Univ Dept Instrument Sci &

    Engn Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Dept Instrument Sci &

    Engn Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Dept Instrument Sci &

    Engn Shanghai 200240 Peoples R China;

    Univ Missouri Food Sci Program Div Food Syst &

    Bioengn Columbia MO 65211 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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