Abstract
Abstract Carbon dioxide and oxygen concentrations which delayed softening and loss of green colour at 15°C without adverse effects on the quality of Bramley's Seedling and Cox's Orange Pippin apples were defined using flow through systems. Modified atmospheres (MA) were then developed for their post-storage marketing in 40 lb (18 kg) cardboard cases lined with suitable polymeric films. Low density polyethylene (LDPE, 30 μm) liners, closed by envelope folding, provided effective, reproducible atmospheres of 7–10% CO 2 and 5–7% O 2 for Bramley apples during a simulated 4-week marketing period under ambient conditions. Since similar films applied to Cox resulted in over-modification of the atmosphere and fruit tainting, micro-perforated LDPE liners were used to provide increased gas permeability without sacrificing mechanical strength; envelope folding of the liner gave uniform atmospheres in replicate cases of fruit. Shelf-life benefits were comparable to those found earlier for the 1 kg retail pillow packs. These new types of box liner are now being introduced into the UK fruit market.
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