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Principal component analysis (PCA) of individual phenols, total phenols, and antioxidant activity of broccoli. Groups Ⅰ and Ⅱ represent the first principal component (PC1) and second principal component (PC2), respectively. CiA represents cinnamic acid. CaA represents caffeic acid. SiA represents sinapic acid. ChA represents chlorogenic acid. FeA represents ferulic acid. HyA represents hydroxybenzoic acid.
