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PCA score plots and PLS-DA score plots of different groups in ESI+ and ESI- mode respectively. The score plots of PCA of NC, ALI, RA-L, RA-M and RA-H groups from PCA analysis in ESI+ (A) and ESI- (B); The score plots of PLS-DA of NC, ALI, RA-L, RA-M and RA-H groups from PLS-DA analysis in ESI+ (C) and ESI- (D); 200-permutation test of PLS-DA model in ESI+ (E) and ESI- (F).
