Abstract
A new type of method of modified atmosphere packaging (MAP), named “partial seal packaging” was designed. A perforated OPP bag (25, μm of thickness and 85×600mm of size) has been used for chinese chives commercially. The center seal part of the non-perforated bag was modified by sealing partially with O.4mm of fused part width, O.6mm of non-fused part width, and 4 mm of sealed lane width to adjust gas permeability. Characteristics of this method and the effects on the freshness of chinese chives were studied. The gas permeability of the bag was 4, 110ml/m2·24hr·atm for oxygen and 9, 300ml/m2·24hr·atm for carbon dioxide. The concentration of oxygen and carbon dioxide in the partial seal packaged bag after storage under 20°C for 5 days was about 5 % and about 11%, respectively. With the chinese chives in this condition, the levels of sugar and ascorbic acid retained high and the occurrence of yellow leaves and decayed leaves were markedly suppressed. The fluctuation of carbon dioxide concentration in partially sealed bags was smaller than that of oxygen concentration. The freshness of chinese chives retained when the partial seal bags were used during simulated shipping in summer compared with the current packaging. Consequently this packaging method is considered promising as low cost MAP for chinese chives.
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