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. 2021 Sep 1;12:700696. doi: 10.3389/fphar.2021.700696

FIGURE 6.

FIGURE 6

The multivariate analysis of skin metabolites in positive (ESI+) and negative (ESI−) modes (n = 8); 1-XP (the BC group), 2-XP (the MC group), 4-XP (the CPT group) (A) PCA score plots in positive modes of the BC, MC and CPT groups. Samples in BC and CPT groups were separated from the MC group; ESI+: R2X = 0.548 (B) OPLS-DA score plots in positive modes of the MC and CPT groups; ESI+: R2X = 0.559, R2Y = 0.989, Q2 = 0.944 (C) PLS-DA score plots in positive modes of the MC and CPT groups; ESI+: R2X = 0.559, R2Y = 0.989, Q2 = 0.962 (D) PCA score plots in negative modes of the BC, MC and CPT groups; ESI−: R2X = 0.638 (E)OPLS-DA score plots in negative modes of the MC and CPT groups; ESI−: R2X = 0.689, R2Y = 0.986, Q2 = 0.970 (F) PLS-DA score plots in negative modes of the MC and CPT groups; ESI−: R2X = 0.729, R2Y = 0.997, Q2 = 0.980.