Jia-feng PANG, Chen TANG, Yan-kun LI, Chong-ran XU, Xi-hui BIAN. Identification of Melamine in Milk Powder by Mid-Infrared Spectroscopy Combined With Pattern Recognition Method[J]. Spectroscopy and Spectral Analysis, 2020, 40(10): 3235

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- Spectroscopy and Spectral Analysis
- Vol. 40, Issue 10, 3235 (2020)

Fig. 1. Raw Infrared spectra of milk powder
(a): Pure milk powder; (b): Melamine-containing milk powder
(a): Pure milk powder; (b): Melamine-containing milk powder

Fig. 2. Spectra examples of pure milk powder and melamine-containing milk powder
a : Melamine-containing milk powder; b : Pure milk powder

Fig. 3. The classification results of PCA
+: Melamine-containing milk powder;◇: Pure milk powder
+: Melamine-containing milk powder;◇: Pure milk powder

Fig. 4. The classification results of NMF
+: Melamine-containing milk powder;◇: Pure milk powder
+: Melamine-containing milk powder;◇: Pure milk powder

Fig. 5. The classification results of PLS-DA
(a): Melamine-containing milk powder; (b): Pure milk powder
(a): Melamine-containing milk powder; (b): Pure milk powder

Fig. 6. The classification results of LDA
+: Melamine-containing milk powder; ◇: Pure milk powder
+: Melamine-containing milk powder; ◇: Pure milk powder

Fig. 7. The classification results of ULDA
+: Melamine-containing milk powder; ◇: Pure milk powder
+: Melamine-containing milk powder; ◇: Pure milk powder

Fig. 8. The transformation vector plot for ULDA

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