Dynamic controlled atmosphere based on carbon dioxide production (DCA - CD): Lower oxygen limit establishment, metabolism and overall quality of apples after long-term storage

摘要

The present study aimed to estimate the lower oxygen limit (LOL) by DCA - CD (Dynamic controlled atmosphere based on CO2 production) for several apple cultivars and seasons and compare this method with DCA - RQ. The metabolism and overall quality maintenance of fruit stored under DCA - CD was also compared with CA - ULO, DCA - CF and DCA - RQ for 'Imperial Gala', 'Fuji Suprema', 'Golden Delicious' and 'Cripps Pink' apples after 9 months of storage plus 7 d of shelf life at 20 degrees C. The experiments were carried out over three years. The DCA - CD method, which is based only by CO2 production by the fruit, correctly estimated the LOL for cultivars and seasons, allowing the pO(2) variation according to fruit metabolism during storage period, with a difference between 0.01 to 0.10 kPa O-2, when compared to DCA - RQ. Storage under DCA - CD allowed the induction of anaerobic metabolism compounds in safe levels, below the odor threshold reported in the literature, and without damaging the cell membranes. Fruit under DCA - CD had lower flesh breakdown incidence and higher flesh firmness and reduced the decay incidence in `Imperial Gala' and `Golden Delicious'.