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Applied Biological Chemistry
Fig. 3 | Applied Biological Chemistry

Fig. 3

From: Interrelationship between secondary metabolites and antioxidant capacities of Centella asiatica using bivariate and multivariate correlation analyses

Fig. 3

Principal component analysis (PCA) biplot of C. asiatica extracts depending on postharvest drying methods, extraction conditions, secondary metabolites, and antioxidant activities. The ellipses mean clusters of correlated extracts according to first and second principal components (PC1 and PC2). The PC1 (63.6% explained variance) and PC2 (15.0% explained variance) accounted for 78.6% of the total variance. The group of three closely horizontal and very tightly knit variable markers for antioxidant activities, including ABTS, DPPH, and FRAP, indicates a group of highly correlated markers, whch is strongly correlated with PC1 (represented by the horizontal axis). 1,5-DCQA, 1,5-dicaffeoylquinic acid; 3,4-DCQA, 3,4-dicaffeoylquinic acid, AA, asiatic acid; AS, asiaticoside; CaA, caffeic acid; ChA, chlorogenic acid; Cy, cynaroside (Luteolin 7-O-β-glycoside); EA, ellagic acid; MA, madecassic acid; MS, madecassoside; Mi, miquelianin (quercetin 3-O-β-glucuronide); Sc, scutellarin (scutellarein 7-O-β-glucuronide)

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