基于MEMS微镜技术的近红外光谱检测奶粉中的三聚氰胺  

Detection of Melamine in Milk Powder Using a Portable Near-infrared Spectroscopy Based on MEMS Micro-mirror

作　　者：张青青[1] 沈晓芳[1] 柴俊宇 谢会开 ZHANG Qingqing;SHEN Xiaofang;CHAI Junyu;XIE Huikai(School of Food Science and Technology, Jiangnan University,Wuxi 214122;Wuxi Wio Tech Co., Ltd.(Wuxi 214122)

机构地区：[1]江南大学食品学院,无锡214122 [2]无锡微奥科技有限公司,无锡214122

出　　处：《食品工业》2018年第12期135-138,共4页The Food Industry

基　　金：江苏省重点研发计划项目(编号BE2016635)

摘　　要：为实现奶粉中三聚氰胺的无损定量快速检测,搭建了一款便携式光学仪器。采用基于MEMS微镜的微型光学平台及手持式探头、光纤及样品池等搭建的傅里叶变换近红外光谱仪,在1 000～2 500 nm波长范围内采集样品光谱,结合光谱预处理、特征波段筛选及主成分数选取来优化光谱信息,依照偏最小二乘法结合交叉验证建立定量模型。在1 400～1 600 nm和1 900～2 400 nm波段内,二阶导数+Savitzky-Golay九点平滑的预处理方法下,当主成分数为5时,交叉验证相关系数为0.965 2,交叉验证均方差为8.22,外部验证结果预测偏差均小于5%,模型预测性能良好。基于MEMS微镜的便携式近红外光谱仪能实现奶粉掺假三聚氰胺定量检测。In order to identify and quantitatively detect the melamine in milk powder, build a portable optical instrument. A spectral platform of Fourier transform near-infrared spectroscopy based on MEMS micro-mirror, handheld probe, optical fiber and sample cell was constructed to a Fourier transform near infrared spectrometer. The near infrared diffuse reflectance spectra of mixed samples using milk powder and melamine with different proportions are collected from 1 000 to 2 500 nm. The reliability of the established PLS model was verified by cross-validation and external test. In 1 400-1 600 nm and 1 900-2 400 nm band, using the second derivative+Savitzky-Golay 9 spots smoothing pretreatment method and the main component of 5, the calibrate correlation coefficient of the quantitative analysis model was 0.965 2, and the root mean square error of calibration was 8.22. The predicted deviation of external validation results was under 5%. The results showed that the portable near infrared spectroscopy based on MEMS micro-mirror could be used for rapid and quantitative identification of adulterated milk powder.

关 键 词：奶粉 三聚氰胺 微机电技术 近红外光谱 

分 类 号：TS252.51[轻工技术与工程—农产品加工及贮藏工程] O657.33[轻工技术与工程—食品科学与工程]