Figure 1. Chemical structures and functional groups of the common phenolic acids, hydroxybenzoic acids (HBAs) and hydroxycinnamic acids (HCAs) used in this study.
Figure 4. Standard calibration curve of gallic acid and quercetin for the determination of total phenolic compounds (TPC) and flavonoid (TF) contents (A) and Trolox for the determination of DPPH (B) and FRAP (C) values.
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