Study of tuna fish skin gelatin (Thunnus albacares) were processed using acetic acid

Abstract

Agustin AT, Sompie M. 2015. Study of tuna fish skin gelatin (Thunnus albacares) were processed using acetic acid. Pros Sem Nas Masy Biodiv Indon 1: 1186-1189. Industrial waste of tuna (Thunnus albacares) has not been used optimally into a product that has high value and utility in the industry. Whereas waste such as bark that composed of hydrolyzed collagen will produce gelatin. Gelatin is a denaturalized protein that is derived from collagen and an important functional biopolymer, which has a very broad application in many industrial fields. This research aimed to study the influence of acetic acid on the characteristics of tuna fish skin gelatin. This study used Completely Randomized Design (CRD) with different concentration of acetic acid solution namely 3%, 6%, and 9%. Each treatment was replicated four times. The analyzed variables were yield, pH values and organoleptic assessment of gelatin. Results from analysis of variance showed that the use of acetic acid solution has a different significant effect (P <0.05) to the yield and the pH value of tuna fish skin gelatin. Results of the organoleptic assessment indicate that the difference in the concentration of acetic acid gives the same effect on the color, texture, and smell of gelatin. Gelatin is a bright color to yellowish, slightly irregular rough texture and odorless. In comparison with commercial gelatin product, it appeared that gelatin from the skin of tuna fish had almost occupied the same color with commercial gelatin. It can be concluded that the characteristics of gelatin from the skin of tuna fish using various concentration of acetic acid solution such as 3%, 6%, and 9% are good quality and in accordance with the Indonesian National Standard.