Figure 3 | Scientific Reports

Figure 3

From: Integrated comparative metabolite profiling via NMR and GC–MS analyses for tongkat ali (Eurycoma longifolia) fingerprinting and quality control analysis

Figure 3

(A) OPLS-DA score plot and (B) loading S-plots derived from E. longifolia authentic root modelled against other commercial samples analysed by 1H-NMR, n = 3. The p(corr)[1] axis represents the correlation of the bin towards the predictive variation. The p[1] axis represents the magnitude of the spectral bins. (C) Top 10 variables that have the greatest influence on the projection as revealed from the developed OPLS-DA. (D) Permutation test (n = 200) as a validation criterion for the OPLS-DA model, the test verifies the validity of the model with negative intercept for the Q2 values.

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