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Direct Detection of Toxic Contaminants in Minimally Processed Food Products Using Dendritic Surface-Enhanced Raman Scattering Substrates

机译:使用树突式表面增强拉曼散射基材直接检测微小加工食品中的有毒污染物

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摘要

We present a method for the surface-enhanced Raman scattering (SERS)-based detection of toxic contaminants in minimally processed liquid food products, through the use of a dendritic silver nanostructure, produced through electrokinetic assembly of nanoparticles from solution. The dendritic nanostructure is produced on the surface of a microelectrode chip, connected to an AC field with an imposed DC bias. We apply this chip for the detection of thiram, a toxic fruit pesticide, in apple juice, to a limit of detection of 115 ppb, with no sample preprocessing. We also apply the chip for the detection of melamine, a toxic contaminant/food additive, to a limit of detection of 1.5 ppm in milk and 105 ppb in infant formula. All the reported limits of detection are below the recommended safe limits in food products, rendering this technique useful as a screening method to identify liquid food with hazardous amounts of toxic contaminants.
机译:我们通过使用树突式银纳米结构,给出了基于表面增强的拉曼散射(SERS)的方法,这些方法在微小加工的液体食品中检测毒性污染物。通过从溶液中的纳米颗粒的电动组装产生。树枝状纳米结构在微电极芯片的表面上产生,以施加的DC偏置连接到AC场。我们将该芯片应用于检测Thiram,毒性果蝇,苹果汁,毒品汁,检测极限115 ppb,没有样品预处理。我们还将芯片应用于检测三聚氰胺,有毒污染物/食品添加剂,在牛奶中检测到1.5ppm和105ppb的婴儿配方中。所有报告的检测限都低于食品的推荐安全限制,使该技术可用作筛选方法,以鉴定具有有害毒性污染物的液体食物。

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