By A. Keith Thompson
The transportation and garage of clean vegetables and fruit is a world operation the place know-how needs to be used to make sure that produce reaches the patron within the absolute best situation. using managed surroundings garage has nice capability to lessen the postharvest use of chemical compounds, preserve dietary caliber and organoleptic features and decrease actual losses.
This revised version contains the most recent learn to supply a finished and up to date assessment of managed and changed surroundings garage. Chapters evaluate the background of the method, the variety of stipulations and applied sciences presently in use for various produce and their impression on flavour, caliber and body structure. additionally, the impact of pests and ailments, environmental components and packaging and features of managed surroundings delivery are thought of intimately in addition to a synthesis of ideas for quite a lot of vegetation.
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Extra info for Controlled atmosphere storage of fruits and vegetables
Hardenburg et al. (1977) showed that apples in CA storage for 6 months and then for 2 weeks at 21 °C in air were ﬁrmer and more acid, and had a lower respiration rate than those that had previously been stored in air. 5% O2 resulted in post-storage suppression of their respiration rate for about 55 h after transfer to air and a marked reduction in the oxidative capacity of isolated mitochondria. , 1993b, 1995). 3 CA Technology It is crucial for the success of CA storage technology that the precise levels of gas are achieved and maintained within the store.
If the store does not reach this standard, efforts should be made to locate and seal the leaks. Temperature Control Fig. 2. Door of a traditional controlled atmosphere storage unit in the UK. O. ) The bags are gas-tight and partially inﬂated, and are placed outside the store with the inlet to the bag inside the store. If the store air volume increases then this will automatically further inﬂate the bag, and when the pressure in the store is reduced then air will ﬂow from the bag to the store. The inlet of the expansion bag should be situated before the cooling coils of the refrigeration unit, in order to ensure the air from the expansion bag is cooled before being returned to the store.
If the refrigerant temperature is well below freezing then this moisture will freeze, reducing the efﬁciency of the cooling system. Removal of moisture from the store air results in the stored crop losing moisture by evapotranspiration. In order to reduce crop desiccation, the refrigerant temperature should be kept close to the store air temperature. However, this must be balanced with the removal of the respiratory heat from the crop, temperature leakage through the store insulation and doors, and heat generated by fans; otherwise the crop temperature cannot be maintained.