二维相关近红外光谱的牦牛奶粉掺伪判别分析
PLS-Discriminant Analysis of Adulterated Yak Milk Powder based on Two-Dimensional Correlation Near-Infrared Spectroscopy
万恒兴 1余展旺 1冯丽雄1
作者信息
- 1. 深圳城市职业学院应用生物学院,广东 深圳 518116
- 折叠
摘要
目的:建立二维相关近红外光谱结合偏最小二乘判别分析方法(PLS-DA)对牦牛奶粉掺伪进行快速判别分析.方法:通过将牦牛奶粉与普通牛奶粉以一定比例混合,共制备56个掺伪样品,并以KS法按3∶1比例划分校正集和预测集;再采集所有样品一维近红外光谱,构建出以浓度为外扰的二维相关谱,基于同步谱与自相关谱的分析,优选出26个特征变量,建立牦牛奶粉掺伪PLS-DA判别模型.结果:通过二维相关光谱分析,优选到的26个特征波长,集中在光谱差异比较明显的区域,均与奶粉中的蛋白质脂肪等营养成分密切相关;建立的牦牛奶粉掺伪判别模型,校正集与预测集的决定系数R2均超过0.97,校正集与预测集的分类准确率均为100％.结论:结果表明,二维相关光谱结合化学计量学方法可以识别掺伪牦牛奶粉的微小差异特征,并进行快速的判别,本方法为乳制品掺伪检测提供了新的思路和方法.
Abstract
To develop a rapid discrimination analysis method for adulterated yak milk powder using two-dimensional near-infrared(2D-NIR)correlation spectroscopy combined with partial least squares discriminant analysis(PLS-DA).Objective:This study.Methods:56 adulterated samples were prepared by blending yak milk powder with regular milk powder in specific proportions.Using the Kennard-Stone(KS)method,the samples were divided into calibration and prediction sets at a ratio of 3∶1.We gathered near-infrared(NIR)spectra from all samples and generated 2D correlation spectra using concentration as the external perturbation.Following this,employing 2D-NIR synchronous and auto-correlation spectra analysis,we identified 26 characteristic variables to develop the PLS-DA discrimination model for detecting adulterated yak milk powder.Results:The 26 characteristic wavelengths identified through 2D-NIR analysis were primarily concentrated in spectral regions showing notable differences and were closely associated with key nutritional components like proteins and fats in the milk powder.The developed PLS-DA discrimination model for detecting adulterated yak milk powder achieved a coefficient of determination(R2)exceeding 0.97,withclassification accuracy rates of 100％for both the calibration and prediction sets.Conclusion:The results demonstrate that 2D-NIR combined with PLS-DA method can identify subtle differences in adulterated yak milk powder and enable rapid discrimination.This method offers a new approach for detecting adulteration in dairy products.
关键词
近红外光谱/二维相关光谱/PLS-DA/牦牛奶粉掺伪Key words
near-infrared spectroscopy(NIR)/two-dimensional correlation spectroscopy(2D-COS)/PLS-DA/yak milk powder adulteration引用本文复制引用
出版年
2024
NETL
NSTL
万方数据