Post harvest diseases fruits and vegetables - Xavier University ...

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FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE Means for Maintaining Host Resistance 133 Photo 1. Delay of aging and decay in broccoli packaged in sealed polyethylene bag during storage and after bag opening. Photo 2. The effect of modified atmosphere packaging with a microperforated film on green onion. http://arab2000.forumpro.fr
FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE 134 Postharvest Diseases of Fruits and Vegetables The retardation of yellowing and decay in CA storage has been reported for various leafy vegetables, for which CO2 and O2 concentrations are controlled during storage (Lipton, 1987). MAP has proved effective for extending the postharvest lives of green herbs, including dill, parsley, coriander, chives, chervil, watercress and sorrel. Such an atmosphere was achieved by packaging fresh herbs in non-perforated polyethylene-lined cartons (Aharoni et al., 1989). Retardation of senescence processes in these yellowing-susceptible herbs was again attributed to the high CO2 levels accumulated within the package and the ethylene-antagonistic action. However, only little commercial success was reported for the use of this procedure with green herbs, because of the difficulty in controlling the O2 and CO2 variations within the package. The drastic decrease in the O2 level, combined with the increased CO2 level, may lead to anaerobic respiration, fermentation and development of an off-flavor (Cantwell and Reid, 1993). In order to obtain beneficial fungistatic concentrations of CO2 within polymeric packages of sweet corn, retail packages were stored at 2°C within additional plastic liners (Rodov et al., 2000). The MA generated in these packages by the corn respiration complied with the recommended range of 5-10 kPa CO2, and inhibited mold development. However, when the produce is transferred to shelf life, the outer layer should be opened to counterbalance the enhancement of the corn respiration at the higher temperature and to prevent O2 depletion and off-flavor development. Further advances in modified atmosphere packaging involve the development of 'active' or *smart' films which, in addition to their ability to generate the conventional modified atmosphere around the commodity, are also capable of actively improving the atmosphere (Church, 1994). These properties have been imparted by introducing into the package, or into the packaging materials, compounds capable of altering the atmosphere composition by absorbing atmospheric gases, vapors, wetness and by-products. Ethylene, which is produced by fruits and vegetables during storage, may accumulate in the package and stimulate their ripening and senescence processes that may lead to shortening their postharvest life. By the use of ethylene-scavenging materials, the smart packaging is capable of retarding these processes, so providing a significant shelf-life extension. As a matter of fact, packaging broccoli in such a film doubled the shelf life of the fresh produce (Church, 1994). The shelf life of banana fruits sealed in bags made of polyethylene treated with the anti-ethylene compound, 1-methylcylclopropane, was extended from 16 days in non-treated polyethylene bags up to 58 days in http://arab2000.forumpro.fr
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Post harvest diseases fruits and vegetables - Xavier University ...

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