**4.2 Oxygen scavengers**

The presence of oxygen can have considerable detrimental effects on some packaged fresh food products. Some edible films have been found to contain some oxygen scavengers and humidity control systems which play an important role in reducing gases contributing to the spoilage of fruits and vegetables. Resende et al*.* [17] indicated that the coating of chitosan/cellulose nonofibril minimises the oxygen diffusion, decreases respiration and delays strawberry oxidation by ascorbic acid reaction.
