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Representative UHPLC-DAD chromatograms of the polyphenols identified in water–ethanol extracts (native powder) of whole apple and apple peel (M. domestica cv. Anna), plum (P. domestica cv. Satsuma), and guava (P. guajava L.). The identity of the polyphenols is as follows: 1, gallic acid; 2, catechin; 3, epicatechin; 4, rutin; 5, quercetin; 6, phloretin xyloglucoside; 7, quercetin glucoside; and 8, phloridzin.
