Prevention of enzymatic browning of apple slices by effect of hydrothermal treatment, N-acetylcysteine and calcium chloride
Keywords:
Minimally processed apple, Hot water treatment, Calcium salt, AntioxidantsAbstract
Minimal processing of apple promotes enzymatic browning. The application of a hydrothermal treatment (HT) combined with antioxidants and calcium salts could be a promising treatment to solve this problem. The aim of the present study was to evaluate the effect of a hydrothermal treatment combined with N-acetylcysteine and calcium chloride (CaCl2) on the postharvest quality and the activity of enzymes related to the darkening of apple slices cv. Granny Smith. The whole fruit was subjected to a hydrothermal treatment (HT, 45 ºC x 10 min), then sliced and immersed for 3 min in the solution of N-acetylcysteine and calcium chloride (NAC-CaCl2). Then, the treated slices were packed in polymer trays and stored at 4 ºC for 24 days. With drawals were made from storage every 6 days and the concentrations of O2 and CO2 inside the container, firmness, color, total phenols, and polyphenoloxidase (PPO) and peroxidase (POD) activities were evaluated. The results showed that the application of HT + NAC-CaCl2 was effective in maintaining the internal color of apple slices and the total phenolic content. The treatment was also useful to reduce PPO and POD activity during storage at 4 ºC. TH+NAC-CaCl2 treatment can be used effectively to reduce the enzymatic darkening of apple slices since it preserves its original color and maintains quality parameters for 24 days.
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