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Highly sensitive and label-free determination of thiram residue using surface-enhanced Raman spectroscopy (SERS) coupled with paper-based microfluidics
Analytical Methods ( IF 2.7 ) Pub Date : 2017-10-11 00:00:00 , DOI: 10.1039/c7ay01637a Jiaji Zhu 1, 2, 3, 4, 5 , Quansheng Chen 1, 2, 3, 4 , Felix Y. H. Kutsanedzie 1, 2, 3, 4 , Mingxiu Yang 1, 2, 3, 4 , Qin Ouyang 1, 2, 3, 4 , Hui Jiang 2, 3, 4, 6
Analytical Methods ( IF 2.7 ) Pub Date : 2017-10-11 00:00:00 , DOI: 10.1039/c7ay01637a Jiaji Zhu 1, 2, 3, 4, 5 , Quansheng Chen 1, 2, 3, 4 , Felix Y. H. Kutsanedzie 1, 2, 3, 4 , Mingxiu Yang 1, 2, 3, 4 , Qin Ouyang 1, 2, 3, 4 , Hui Jiang 2, 3, 4, 6
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In this study, a paper-based microfluidic surface-enhanced Raman spectroscopy (SERS) device was employed for the determination of trace level thiram. The paper-based microfluidic device was fabricated by cutting a hydrophilic region which had been printed on the filter paper and then pasting it onto sellotape. The Au@Ag nanoparticles (NPs) were synthesized with a 30 nm Au core and 7 nm Ag shell and used as the SERS probe. The synthesized nanoparticles were dropped in one of the sample adding zones of the paper-based microfluidics and the thiram solution was dropped in another one. The solutions flowed through their own channels by capillary action and mixed together in the reaction chamber. The optimization studies on the use of paper-based microfluidic devices are discussed. In SERS measurements, the intensity of the peak at 1143 cm−1 was highly sensitive, and so it was chosen as an ideal peak for the quantitative analysis of the concentration of thiram solution. The limit of detection (LOD) of thiram was as low as 1.0 × 10−9 mol L−1, and the relative standard deviation (RSD) results analyzed at 10 random spots in the SERS measurement area were all below 10%. The recovery values of thiram in adulterated tea samples were from 95% to 110%. All these results suggest that this proposed method is a prospective candidate for trace level thiram detection.
中文翻译：
使用表面增强拉曼光谱（SERS）结合纸基微流控技术高灵敏，无标记地测定西拉姆残留
在这项研究中，基于纸的微流控表面增强拉曼光谱仪（SERS）被用于测定痕量锡拉姆。通过切割已经印刷在滤纸上的亲水区域，然后将其粘贴到胶带上，来制造基于纸的微流体装置。合成具有30 nm Au核和7 nm Ag壳的Au @ Ag纳米颗粒（NPs），并将其用作SERS探针。将合成的纳米颗粒滴入纸基微流控系统的一个样品添加区中，将硫仑溶液滴入另一个。溶液通过毛细作用流经它们自己的通道，并在反应室中混合在一起。讨论了基于纸的微流控设备使用的优化研究。在SERS测量中，在1143 cm处的峰强度-1是高度敏感的，因此它被选作定量分析thiram溶液浓度的理想峰。硫胺素的检出限（LOD）低至1.0×10 -9 mol L -1，在SERS测量区域的10个随机点处分析的相对标准偏差（RSD）结果均低于10％。掺假茶叶样品中的锡拉姆的回收率为95％至110％。所有这些结果表明，该提议的方法是痕量级锡拉姆检测的预期候选者。
更新日期：2017-11-09
中文翻译：
使用表面增强拉曼光谱（SERS）结合纸基微流控技术高灵敏，无标记地测定西拉姆残留
在这项研究中，基于纸的微流控表面增强拉曼光谱仪（SERS）被用于测定痕量锡拉姆。通过切割已经印刷在滤纸上的亲水区域，然后将其粘贴到胶带上，来制造基于纸的微流体装置。合成具有30 nm Au核和7 nm Ag壳的Au @ Ag纳米颗粒（NPs），并将其用作SERS探针。将合成的纳米颗粒滴入纸基微流控系统的一个样品添加区中，将硫仑溶液滴入另一个。溶液通过毛细作用流经它们自己的通道，并在反应室中混合在一起。讨论了基于纸的微流控设备使用的优化研究。在SERS测量中，在1143 cm处的峰强度-1是高度敏感的，因此它被选作定量分析thiram溶液浓度的理想峰。硫胺素的检出限（LOD）低至1.0×10 -9 mol L -1，在SERS测量区域的10个随机点处分析的相对标准偏差（RSD）结果均低于10％。掺假茶叶样品中的锡拉姆的回收率为95％至110％。所有这些结果表明，该提议的方法是痕量级锡拉姆检测的预期候选者。
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