AbbreviationsPWC: Physiological Water Conservation; FDI: Fruit Disease Index; PV: Peroxide value
IntroductionThe traditional concept of a packaging is to preserve the quality of the product with a minimal product/packaging interaction, however, in recent years, a wide variety of packages have been employed for interaction with products to provide desirable or beneficial effects [1]. Active packaging technology is a relatively novel concept beneficial for extending the product shelf-life, maintaining its nutritional and sensory quality, as well as contributing to the microbial safety [2]. The ability of edible film or coating as a type of active packaging to carry some products additives such as antioxidants, antimicrobials, colorants, flavors, fortified nutrients and spices are being studied [3].Chitosan, a natural carbohydrate copolymer [-(1-4)-2-acetamido-d-glucose and -(1-4)-2-amino-d-glucose units], which is yielded from deacetylation of chitin [poly-(1-4)-N acetyl2d-glucosamine], is harmless to humans, animals and, and the environment; and has been studied for efficacy in inhibiting decay and extending shelf life of fruits. Chitosan and its derivatives have been shown to inhibit the growth of a wide range of fungus [4,5], so one of interest application of this biopolymer is products preservation because of its ability to be used as coating materials to extend the shelf life of different products [6,7]. Recently, the use of A. vera gel as an edible coating has been reported to prolong the shelf life and to delay the changes in the parameters related to deterioration of quality of products [8,9].A. vera, a cactus-like plant, is a perennial succulent belonging to the Liliaceae family which grows in hot and dry climates [10].The plant has triangular, fleshy leaves with serrated edges, yellow tubular flowers and fruits containing countless seeds. For centuries, the yellow latex (exudate) and clear gel (mucilage), exuded from the large leaf parenchymatic cells of A. vera, has been employed for medical and pharmaceutical purposes such as anti-inflammatory effects, treatment of skin burns, protection of the skin against UV and gamma radiation damage, treatment of frostbite and psoriasis, supporting and enhancing the immune system, antiviral and antitumor activity, laxative effects, and, last but not least, wound healing [11]. However, the main use of A. vera gel is mainly in the cosmetology and medication; More recently, it has found its application in the food industry as a source of functional foods in ice-cream, drinks and beverages [12], and, due to antifungal activity of A. vera gel, as an unique edible coating (plain or in combination with other components) to extend the post-harvest storage of arctic snow [4] A. vera gel based edible coatings have been shown to prevent loss of moisture and firmness, control respiratory rate and maturation development, delay oxidative browning, and reduce microorganism proliferation in fruits such as sweet cherry, table grapes and nectarines [8,12,6]. There are no reports pre...