Extração de colágeno da pele de tilápia do Nilo com protocolo ácido

Abstract

Tilapia, due to its high temperature tolerance, captive breeding ability, fast growth and excellent cost benefit, has been of great interest in aquaculture, being the most produced fish in Brazil today. However with the increase of tilapia production started to generate larger amounts of organic waste mainly from filleting, which discards 70% of waste. As an alternative to reduce these residues and add greater commercial value to them, several studies have been performed to extract collagen from Tilapia skin. Collagen is a structural protein with functional principles that is intended to assist in the structure of connective tissues in the body. In this study collagen extraction was tested using an acid protocol, in which tilapia skins were pretreated in acid medium and with saline precipitation, with variations in time and concentration. After collagen extraction it was evaluated by analysis of ash, moisture, protein, solubility and pH. The collagen obtained presented low ash contents and the humidity is within the ones shown in the literature. Regarding the amount of protein, collagen showed contents of 68.73 to 80.58% and a low solubility between 4.03 to 6.93%. Therefore, it could be concluded that acid extraction is a possible collagen extraction medium and Tilapia skin is a good alternative to help reuse waste generated in the fish industry.