Abstract
Phenolic acids, flavanols, flavonols, flavones and dihydrochalcones are found in apples. An extraction procedure with minimal pre-treatment and an ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) method have been validated to determine polyphenols in flesh and peel of several varieties of apples (Golden, Granny, Pink Lady, Red, Royal, Ambrosia and Fuji). The varieties with the highest concentration of phenolic compounds in flesh were Granny and Fuji (793.8 and 793.1 mg/kg dry weight (DW), respectively), whereas the highest concentration in peel was obtained in Pink Lady (4,106.7 mg/kg DW), showing significant differences in relation to the other varieties. The peel of apple showed higher polyphenolic content than flesh because of the high levels of flavonols glycosides, epicatechin and phloridzin. The phenolic content in fresh-cut apple (Royal variety) was also evaluated, observing a higher concentration of phenolic compounds in fresh apple (562.8 and 3,339.5 mg/kg DW in flesh and peel, respectively) than in fresh-cut apple (375.8 and 2,475.3 mg/kg DW in flesh and peel, respectively).
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