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Principal component analysis (PCA) score plot of metabolites identified from Hibiscus calyces using different extraction methods. H1: 1% HCl in methanol, H2: 80% methanol, H3: 100% water, H4: 1% HCl in water, H5: 70% ethanol, H6: 50% methanol, H7: methanol and H8: 1% HCl in 70% ethanol.
