Rapid detection of adulteration of minced beef using Vis/NIR reflectance spectroscopy with multivariate methods

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 230; p. 118005
• Main Authors: Weng, Shizhuang, Guo, Bingqing, Tang, Peipei, Yin, Xun, Pan, Fangfang, Zhao, Jinling, Huang, Linsheng, Zhang, Dongyan
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 05.04.2020
• Subjects: Adulterated minced beef; Multivariate methods; Rapid detection; Visible/near-infrared reflectance spectroscopy; Visible/near-infrared reflectance spectroscopy; Adulterated minced beef; Rapid detection; Multivariate methods
• ISSN: 1386-1425; 1873-3557
• DOI: 10.1016/j.saa.2019.118005

High economic returns induce the continuous occurrence of meat adulteration. In this study, visible/near-infrared (Vis/NIR) reflectance spectroscopy with multivariate methods was used for the rapid detection of adulteration in minced beef. First, the reflectance spectra of different adulterated minced beef samples were measured at 350–2500 nm. Standardization and Savitzky–Golay (SG) smoothing were applied to reduce spectral interference and noise. Then, support vector machine (SVM), random forest (RF), partial least squares regression (PLSR), and deep convolutional neural network (DCNN) were adopted for adulteration type identification and level prediction. Moreover, principal component analysis (PCA), locally linear embedding (LLE), subwindow permutation analysis (SPA), and competitive adaptive reweighted sampling (CARS) were performed to eliminate redundant information. SG smoothing performed better on interference reduction. DCNN and PCA identified adulteration type with the accuracy above 99%. In adulteration level prediction, the RF with spectra of important wavelengths selected by CARS provided optimal performance for beef adulterated with pork, and coefficient of determination of prediction (R2P) and the root mean square error of prediction (RMSEP) were 0.973 and 2.145. The best prediction for beef adulterated with beef heart was obtained using PLSR and CARS with R2P of 0.960 and RMSEP of 2.758. Accordingly, Vis/NIR reflectance spectroscopy coupled with multivariate methods can provide the rapid and accurate detection of adulterated minced beef. Here, we develop a novel method for the fast detection and accurate identification of adulteration in minced beef using visible/near-infrared (Vis/NIR) reflectance spectroscopy with multivariate methods. [Display omitted] •Vis/NIR reflectance spectroscopy was used for determination of minced beef adulteration.•Multivariate methods were adopted for intelligent analysis of adulteration.•DCNN was introduced for type identification and level prediction of adulteration.