Optimization of gelatin extraction and physico-chemical properties of fish skin and bone gelatin: Its application to panna cotta formulas

Abstract

The utilization of fish processing waste for value-added by-products has attracted considerable attention. The present study aims to evaluate the gelatin extracted from fish skin and bone for application to Panna cotta products. The optimum conditions of gelatin extraction from Sea Bass, Nile tilapia and Red tilapia skin and bone wereat 80 and 90 °C for 2.5 h, respectively. Nile tilapia skin and bone gelatins represent the most hydroxyprolinecontent of 45.38 ±1.32 and 23.28±1.12 g, respectively (p≤0.05). Nile tilapia skin gelatin has the strength gel of 860.50 g which higher than Nile tilapia bone. The foaming ability normally increases at pH 3 to 6 and has emulsifier ability. Sodium chloride (NaCl) and activated carbon have effecting to removethe color and odor of extracted gelatin. Nile tilapia bonegelatin is the most suitable asan ingredient for Panna Cotta recipe. Panna Cotta milk mix berries has the maximum satisfaction levels in the female and male group of 4 to 5 (like very much to like extremely) for their flavor and texture by surveying satisfaction of customer in 5 points hedonic scale (30 persons). The average costs of production are between 0.56-0.71 US$/cup (200 g). Therefore, it can be concluded that fish gelatin can apply the ingredient in Panna Cotta Recipe or cook with another kind of foods.The extracted fish gelatin has desirable chemical and physical properties. It is suitable as a food ingredient which aspects as an alternative source of mammalian gelatin.