Elaboração de filme biodegradável a partir da gelatina extraída da pele de tilápia do Nilo (Oreochromis niloticus)

Abstract

The Tilapia has featured in aquaculture, representing approximately 40% of production in the country. After filleting the fillet yield reaches around 30%, the other 70% is generated waste and these high-quality raw materials can be processed into various products, such as gelatin. The production of gelatin from tilapia skin appears to be a good alternative in the use of waste, since it has a large amount of collagen in its composition. In this study, gelatin was extracted from tilapia skin with water only at 93ºC temperature and were evaluated the proximate composition (moisture, ash, protein and lipids) and income. The gelatins obtained showed low moisture content (7.26%), ash (2.13%) and high lipid content (4.19%) and protein (86.4%). With this extracted gelatin were produced biodegradable films showed yellowish where the value of a * is (0.72) which represents the change in the red (+); b * (38,03) changes to yellow (+) and L * (75.39) brightness, high solubility (100% soluble) and 0,177mm thick. Unable to make the film breakdown voltage, due to its high elasticity where texturometer this university can’t achieve the necessary distance to the breakup. Thus, it was concluded that the skin of tilapia has high potential as a source for gelatin production used to produce biodegradable films and these films have good homogeneity and handling.