Thesis (M.Sc.) - Cairo University - Faculty of Agriculture - Department of Pomology

The present investigation was carried out in the postharvest laboratory of the Faculty of Agriculture Cairo University for two successive seasons i.e 2012 - 2013. Fruits were harvested at mature stage in a private Valencia orange orchard located at Elgiza Government, Egypt. Fruits chosen for this study were uniform in size, color and weight. Each 210 fruits were immersed in one of the following treatments for 10 minutes before cold storage. The treatments were: Chitosan 2% - Chitosan 2% + citric acid 0.5% - chitosan 2% + malic acid150 ppm - citric acid 0.5% - citric acid 0.5% + malic acid 150 ppm - malic acid 150 ppm - chitosan 2% + citric 0.5% + malic acid 150 ppm - control (fruits were taken into storage without any pretreatment). After treatments application, fruits from each treatment were waxed and placed in four carton boxes (one for weight loss studies, one for decay studies and two for samples to be taken). Carton were weighed and placed in cold storage at 5oC and 95% RH for 90 days

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