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PCA analysis results of UPLC-MS. All samples in ESI+ modes distributed in 2-dimensional plot (a) and in 3-dimensional plot (b). All samples in ESI− modes distributed in 2-dimensional plot (c) and in 3-dimensional plot (d). To avoid a too complicated plot, EA was abbreviated as E, NEA as N, HC as H, and QC as Q (PC1=27.5%, PC2=12.6%, and PC3=10.7% for ESI+ and PC1=11.6%, PC2=7.08%, and PC3=6.43% for ESI−).
