Qualitative Identification of Adulterated Huajiao Powder Using Near Infrared Spectroscopy Based on DPLS and SVM
WU Xi-yu1, 3, ZHU Shi-ping1*, WANG Qian2, LONG Ying-kai2, XU Dan3, TANG Chao1
1. College of Engineering and Technology, Southwest University, Chongqing 400716, China
2. Chongqing Electric Power Corporation Research Institute, Chongqing 401123, China
3. College of Food Science, Southwest University, Chongqing 400716, China
Abstract：Huajiao is one of the “eight famous condiments” in China. Some cheaper adulterants were found to be added into Huajiao powder and in order to identify adulterated Huajiao powder qualitatively and quickly, a direct detecting method using near infrared (NIR) spectroscopy coupled with discriminant partial least squares (DPLS) and support vector machine (SVM) had been developed in this study. Wheat bran, rice bran, corn flour and rosin powder with 1 Wt/Wt.% incremental concentration gradient were mixed with red Huajiao powder and green Huajiao powder separately and the adulterated Huajiao powder with range of 1~54 Wt/Wt.% were prepared. Diffuse NIR spectra (800~2 500 nm) of pure and adulterated Huajiao powder were acquired. Principal component analysis (PCA) on the spectral data of all 462 samples was used and the first three principal components accounted for 98.72% of total variation. It was effective for clustering different adulterated Huajiao powder from the main composition PC1, PC2 and PC3 score plot. 347 samples as a calibration set and with the characteristic band spectrum 2 000~2 200 nm as input, kinds of qualitative models with different spectra pretreatment were established using DPLS and SVM analysis, which were for predicting the rest 115 samples. Results showed that, using different pretreatment methods, and the qualitative identification accuracy of the validation set were between 97.39%~100%, in which adulterated Huajiao powder could be identified totally. NIRS based on DPLS and SVM is a rapid and nondestructive tool for the qualitative analysis of adulterated Huajiao powder.
Key words：Huajiao powder; Near infrared spectroscopy; Principal component analysis; Discriminant partial least squares; Support vector machine; Adulterants
吴习宇，祝诗平，王 谦，龙英凯，徐 丹，唐 超. DPLS和SVM的掺假花椒粉近红外光谱定性鉴别[J]. 光谱学与光谱分析, 2018, 38(08): 2369-2373.
WU Xi-yu, ZHU Shi-ping, WANG Qian, LONG Ying-kai, XU Dan, TANG Chao. Qualitative Identification of Adulterated Huajiao Powder Using Near Infrared Spectroscopy Based on DPLS and SVM. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(08): 2369-2373.
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