Shelf life Estimation of orange ( Thompson’s Novel ) with edible coating (Chitosan - Aloe vera) and modified atmosphere packaging

Navel oranges are cultivated in many countries including Iran and in Comparable to With other cultivars of citrus have an especial importance in the world. During storage, orange undergoes a number of deteriorative reactions(ascorbic acid degradation, development of off - flavour, changes in colour, texture, appearance), resulting in quality and shelf life degradation of the product. The aim of this study was to evaluate the effect of edible coatings and modified atmosphere packaging on shelf life of orange. In this research, orange was treated with edible coating Chitosan - Aloe vera(at ratio of 80:20) then packed in normal atmosphere, non active MAP and active MAP and stored at 10, 30 °C for 9 weeks. During this period of storage sensory properties(taste, texture, color and overall acceptability ), vitamin C and color(L*,b*,a*) were evaluated and estimate the modeling shelf life of orange with Accelerated Shelf Life Testing (ASLT) method. Results showed that coating caused increasing shelf life of orange. Temperatu re and storage time also showed s ignificant effects on total sensory attributes and with increasing storage time and temperature, overall acceptability, the amount of vitamin C, L* and b* decreased. Maximum shelf life (106 days) determined at 10 °C for coated orange with normal atmosphere based on overall acceptability. There was significant correlation between shelf life results obtained from sensory evaluation and the vitamin C loss kinetics.For shelf life estimating, regression second order function had best fit with R2=1 for all of treatments. According to the results, a combination of edible coating(Chitosan-Aloe vera) and normal atmosphere treatment was suggested for increasing the storage life of oranges (Thompson’s Novel).