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Raman-Spectroscopy-Based Chemical Contaminant Detection in Milk Powder

机译：基于拉曼光谱的奶粉中化学污染物检测

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摘要

Addition of edible and inedible chemical contaminants in food powders for purposes of economic benefit has become a recurring trend. In recent years, severe health issues have been reported due to consumption of food powders contaminated with chemical substances. This study examines the effect of spatial resolution used during spectral collection to select the optimal spatial resolution for detecting melamine in milk powder. Sample depth of 2mm, laser intensity of 200mw, and exposure time of 0.1s were previously determined as optimal experimental parameters for Raman imaging. Spatial resolution of 0.25mm was determined as the optimal resolution for acquiring spectral signal of melamine particles from a milk-melamine mixture sample. Using the optimal resolution of 0.25mm, sample depth of 2mm and laser intensity of 200mw obtained from previous study, spectral signal from 5 different concentration of milk-melamine mixture (1%, 0.5%, 0.1%, 0.05%, and 0.025%) were acquired to study the relationship between number of detected melamine pixels and corresponding sample concentration. The result shows that melamine concentration has a linear relation with detected number of melamine pixels with correlation coefficient of 0.99. It can be concluded that the quantitative analysis of powder mixture is dependent on many factors including physical characteristics of mixture, experimental parameters, and sample depth. The results obtained in this study are promising. We plan to apply the result obtained from this study to develop quantitative detection model for rapid screening of melamine in milk powder. This methodology can also be used for detection of other chemical contaminants in milk powders.
机译：为了经济利益的目的，在食品粉末中添加可食用和不可食用的化学污染物已成为一种流行趋势。近年来，由于食用被化学物质污染的食品粉末，已经报道了严重的健康问题。这项研究检查了光谱收集过程中使用的空间分辨率的影响，以选择最佳的空间分辨率来检测奶粉中的三聚氰胺。事先确定2mm的样品深度，200mw的激光强度和0.1s的曝光时间是拉曼成像的最佳实验参数。确定0.25mm的空间分辨率是从牛奶-三聚氰胺混合物样品中获取三聚氰胺颗粒光谱信号的最佳分辨率。使用先前研究获得的0.25mm的最佳分辨率，2mm的样品深度和200mw的激光强度，获得了5种不同浓度的牛奶-三聚氰胺混合物（1％，0.5％，0.1％，0.05％和0.025％）的光谱信号采集以研究检测到的三聚氰胺像素数量与相应样品浓度之间的关系。结果表明，三聚氰胺浓度与检测到的三聚氰胺像素数呈线性关系，相关系数为0.99。可以得出结论，粉末混合物的定量分析取决于许多因素，包括混合物的物理特性，实验参数和样品深度。在这项研究中获得的结果是有希望的。我们计划应用从这项研究中获得的结果来开发定量检测模型，以快速筛查奶粉中的三聚氰胺。该方法还可以用于检测奶粉中的其他化学污染物。

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  • 来源
  • 会议地点 Baltimore MD(US)
  • 作者

    Sagar Dhakal; Kuanglin Chao; Jianwei Qin; Moon S. Kim;

  • 作者单位

    Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, 10300 Baltimore Avenue, Bldg 303 BARC- East, Beltsville, MD, USA 20705;

    USDA/ARS/EMFSL, Bldg. 303, BARC-East, 10300 Baltimore Ave., Beltsville, MD 20705-2350, USA;

    Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, 10300 Baltimore Avenue, Bldg 303 BARC- East, Beltsville, MD, USA 20705;

    Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, 10300 Baltimore Avenue, Bldg 303 BARC- East, Beltsville, MD, USA 20705;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Quantitative analysis; Raman; melamine-milk mixture; food powder; spatial resolution; sample depth;

    机译：定量分析；拉曼三聚氰胺-牛奶混合物；食物粉;空间分辨率样本深度;

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