Fig. 4

Multivariate data analysis of the Q-TOF LC/MS/MS metabolomic data from SC and SQ samples using PCA and OPLS-DA (n = 2). (a) OPLS-DA permutation test plot, (b) OPLS-DA model validation plot, (c) OPLS-DA score plot of PC1 vs. PC2 scores, (d) OPLS-DA S-plot, illustrating the covariance p[1] against correlation p(corr)[1] of discriminating variables between alcoholic and aqueous extracts of S. persica.