Abstract
Enzymatic browning is the main cause of quality loss in minimally processed fresh-cut apples and this study was aimed to control it by evaluating the use of a treatment with α-lipoic acid and ascorbic acid on Golden Delicious apples. Also hexanal, an effective natural enhancer of apple odor, was added to the treatment. At the end of the preservation period, colorimetric analysis demonstrated that α-lipoic acid exerts an anti-browning effect comparable with that of ascorbic acid about 60 times more concentrated and, moreover, chemical assays demonstrated its synergistic interaction with this substance. The application of the “antibrowning mix” does not substantially change the volatile profile of the apple slices while the addition of hexanal (0.076 mmol per liter of air) improves it primarily with an increased production of hexyl acetate (about 86% of the average aromatic component), without modifying the fruit respiration.
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