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