**4.1 Moisture barrier**

These films prevent moisture loss, aroma loss or water uptake by the food material or even penetration of oxygen which produces a good storability condition for these food products, Edible coating enhance the texture and improves the product appearance and prolong the shelf life by creating semi-permeable barriers. Emamifar and Bavaisi [15] developed a bio-nanocomposite coating with sodium alginate and nano-ZnO and applied it on strawberry. The results revealed a significant weight retention than those without the films. Again Titanium and silver nanocomposite packaging displayed same results on mangoes [16].
