Abstract
Apple slices, ozonised in water (1:2 w/v; 200mg O3/h, for 5min) and then soaked in a solution containing ascorbic acid (200mgkg−1), citric acid (200mgkg−1) and sodium benzoate (200mgkg−1) for 10min, were coated with edible surface coatings made up of shellac and aloe gel (AG), separately and in combination. Application of coatings was found to significantly (p<0.05) reduce the respiration and ethylene synthesis rates as well as electrolyte leakage. The AG-coated samples showed reduced polyphenol oxidase (96.1) and peroxidase activity (211.2) followed by the samples coated with combination of shellac+AG, and shellac alone; the uncoated samples being showing maximum values (122.8, 288.5) for these enzymes in terms of units/g/min, respectively. The L*, a* and b* values, firmness, microbiological and keeping quality of the coated slices also showed reduced changes during storage for 30days at 6±1°C.
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