Journal of Food and Drug Analysis

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Journal of Food and Drug Analysis Comprehensive analysis of Polygoni Multiflori Radix of different geographical origins using ultra-high-performance liquid chromatography fingerprints and multivariate chemometric methods Li-Li Sun, Meng Wang, Hui-Jie Zhang, Ya-Nan Liu, Xiao-Liang Ren, Yan-Ru Deng, Ai-Di Qi Journal of Food and Drug Analysis DOI: 10.1016/j.jfda.2016.11.009 Copyright © 2016 Terms and Conditions

Figure 1 UPLC–PDA chromatographic fingerprints at 260 nm of 24 samples from six different geographical regions as listed in Table 1. PDA = photodiode array detection; UPLC = ultra-high-performance liquid chromatograph. Journal of Food and Drug Analysis DOI: (10.1016/j.jfda.2016.11.009) Copyright © 2016 Terms and Conditions

Figure 2 MCR–ALS results of chromatographic segment k. (A) The resolved elution profiles of augmented MCR–ALS, (B) pure elution profile of sample AH11, and (C) the resolved spectral profiles. ALS = alternating least squares; MCR = multivariate curve resolution. Journal of Food and Drug Analysis DOI: (10.1016/j.jfda.2016.11.009) Copyright © 2016 Terms and Conditions

Figure 3 Two-dimensional PCA score plot (PC1 vs. PC2) of all chromatographic fingerprints of Polygoni Multiflori Radix samples as listed in Table 1. PCA = principal component analysis. Journal of Food and Drug Analysis DOI: (10.1016/j.jfda.2016.11.009) Copyright © 2016 Terms and Conditions

Figure 4 The variance-weighted distances between cluster centers of (A) 72 Polygoni Multiflori Radix samples and (B) 22 components obtained from Ward's method. Journal of Food and Drug Analysis DOI: (10.1016/j.jfda.2016.11.009) Copyright © 2016 Terms and Conditions

Figure 5 Kohonen map of 72 samples. (A) Distribution of 72 Polygoni Multiflori Radix samples on the map and (B) assigned group distribution on the map. Journal of Food and Drug Analysis DOI: (10.1016/j.jfda.2016.11.009) Copyright © 2016 Terms and Conditions

Figure 6 The weights of five main vectors in each class obtained from CP-ANN analysis. (A) Cluster I, (B) Cluster II, (C) Cluster III, and (D) Cluster IV. CP-ANN = counter-propagation artificial neural network. Journal of Food and Drug Analysis DOI: (10.1016/j.jfda.2016.11.009) Copyright © 2016 Terms and Conditions

Journal of Food and Drug Analysis DOI: (10.1016/j.jfda.2016.11.009) Copyright © 2016 Terms and Conditions