食品科学2018，Vol.39Issue(12)：295-300,6.DOI:10.7506/spkx1002-6630-201812045
基于线扫描拉曼高光谱系统的奶粉中硫氰酸钠无损检测
Non-Invasive Detection of Sodium Thiocyanate in Milk Powder Using Line-Scanning Raman Hyperspectral Imaging System
摘要
Abstract
In this study, a line-scanning Raman hyperspectral imaging system was built to quantify sodium thiocyanate illegally added in skim milk powders with large sample areas. Firstly, the penetration depth of Raman signal produced by sodium thiocyanate in skim milk powders was measured. Then, ten milk powder mixtures with different concentrations of sodium thiocyanate were prepared and their hyperspectral images were also collected. The Gaussian filter smoothing and the airPLS baseline correction methods were used to preprocess the Raman spectra. The corrected images at 2 068.48 cm-1waveband were extracted to determine the presence of sodium thiocyanate particles. The concentration and spatial distribution of the sodium thiocyanate particles were finally obtained using a simple binarization method. The results showed that the average Raman intensity of all the pixels in the region of interest increased linearly with the increase of sodium thiocyanate particles, and the determination coefficient was 0.991 5. In the binary images, the sum of all sodium thiocyanate pixels in the region of interest increased exponentially. The limit of detection (LOD) for sodium thiocyanate concentration was estimated as 0.01% without using any chemical reagents. This system could expand the area of milk powder samples to 80 mm × 80 mm at a time in a non-invasive and non-contact way. In our research, the sodium thiocyanate particles could be fast, non-destructively and extensively detected using the line-scanning Raman hyperspectral imaging system. Both the concentration and the spatial distribution of the sodium thiocyanate particles in skim milk powder could be acquired at the same time. This method has a great potential for practical application.关键词
高光谱成像技术/拉曼光谱/脱脂奶粉/硫氰酸钠/线扫描Key words
hyperspectral imaging/Raman spectroscopy/skim milk powder/sodium thiocyanate/line-scanning分类
化学化工引用本文复制引用
刘宸,杨桂燕,王庆艳,黄文倩,王超鹏,王晓彬,陈立平..基于线扫描拉曼高光谱系统的奶粉中硫氰酸钠无损检测[J].食品科学,2018,39(12):295-300,6.基金项目
国家自然科学基金青年科学基金项目(61605009) （61605009）
北京市科技新星计划项目(Z161100004916076) （Z161100004916076）
北京市优秀人才项目(2015000021223ZK40) （2015000021223ZK40）
