Abstract
Our work was performed to determine the total phenolic content (TPC) and antioxidant properties from peel and flesh fruit tissues of four peach varieties, measured separately in extractable polyphenols (EPPs) and nonextractable polyphenols (NEPPs) for the first time. TPC in peach peels was approximately two or three times higher than that in the flesh tissues of all the tested peach varieties. Likewise, a similar pattern was presented for the antioxidant activities. As well as EPPs, NEPPs were also contributors to total antioxidant activity (TAA) of peach peels and fleshes, even though they accounted for less percentage of TAA compared with EPPs. Correlation analysis showed that TPC of peach extracts had a high relationship (p < .05) with their corresponding TAA. In addition, in terms of TPC and TAA, a strong correlation between EPPs and NEPPs, peels and fleshes was also detected. Practical applications Our research specifically demonstrated that NEPPs in peach tissues (peel vs. flesh), usually ignored in previous studies, are also important dietary antioxidants, which may exert vital biological properties and could be usefully applied to the food, pharmaceutical, or cosmetic industries for development of diverse nutraceuticals or value-added products.
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