Özet:

Phenolic content, browning degree, enzyme activities (polyphenol oxidase (PPO), pectin methylesterase (PME) and β-glucosidase) of three apricot varieties of Malatya region of Turkey were assessed during ripening on trees over two years. All measured variables varied across the cultivar, ripening stage and year. Both individual and total phenolic contents (TPC) decreased with ripening in all the cultivars studied. The activity of PPO, PME, and β -glucosidase continuously decreased with ripening in both harvest years. In all varieties browning degree decreased with ripening. It was observed that the greatest browning was in Hacıhaliloğlu cultivar at all ripening stages. Significant differences (p < 0.01) for browning degree were found among apricot variety and ripening. There was a significant positive correlation (p < 0.01) between browning degree and activity of PPO (R= 0.92), chlorogenic acid (R= 0.82), catechin (R=0.73,) total phenolic content (R=0.99).

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