The Effect of Concentration Acetic Acid in Extraction of Gelatin from Nila Fish (Oreochromis niloticus) to The Physical Characteristics

Gelatin is a natural material from animal which obtained from hydrolysis process of collagen. Generally, gelatin is extracted through an acidic process This research to observe of concentration acetic acid in extraction of gelatin from nila fish (Oreochromis niloticus) skin to the physical characteristics. The treatment of concentration acetic acid (0,10; 0,15; 0,20 and 0,25 M ) for soaking time (1, 2, 3, 4 and 5 hours ) in demineralization process before extraction. The observation of physical characteristics is viscosity, ash content, pH and color. Viscosity of gelatin from 1 and 5 hour of soaking time at the same concentration treatment were significantly different. Ash content shows a significantly different from 5 hours of soaking time treatment compared others treatment, while pH was no significantly different. Analyze for color of gelatin based on L*, a*, b* space were describe the lightness. The value "L" and "b" color of gelatin sample from acetic acid concentration treatment were significantly different while from soaking time treatment for 1 - 4 hours were no significantly different. The value "a" from all of gelatin sample were significantly different.