The effect of citric and acetic acid treatment on gelatin production from catfish skin

¹ Research Centre for Agroindustry, Research Organization for Agriculture and Food, National Research and Innovation Agency (BRIN), 16911 Cibinong, Indonesia
² School of Postgraduate Studies, Universitas Djuanda, 16720 Bogor, Indonesia
³ Research Center for Biomass and Bioproduct, Research Organization for Life Sciences and Environment, National Research and Innovation Agency (BRIN), 16911 Cibinong, Indonesia
⁴ Research Center for Cooperative, Corporation, and Peoples Economy, Research Organization for Governance, Economy, and Community Welfare, National Research & Innovation Agency, 12710 Jakarta, Indonesia
⁵ Centre for Agro-based Industry (BBSPJIA), Ministry of Industry, 16122 Bogor, Indonesia

^* Corresponding author: namilestari65@gmail.com

Abstract

The demand for halal gelatin is increasing, but the supply is decreasing. One solution to this problem is to produce halal gelatin from fishing waste, particularly catfish skin. A study was conducted to determine the impact of adding acid to the gelatin extraction process. Citric and acetic acid were used at concentrations of 0.05%, 0.075%, and 0.1%. The yield of gelatin varied from 14.97% to 24.1% depending on the concentration of acid used. The highest yield was obtained using a concentrated solution of acetic acid. Gelatin extracted using a citric acid concentration of 0.075% had the lowest water content. The pH of the solution ranged from 4 to 5, and the viscosity ranged from 10 to 14 MPa. The resulting gelatin exhibited a strength of between 200 and 259 blooms. The production process that used acetic acid on immersion was the most efficient because it resulted in high quantities of gelatin, low water content and viscosity, and good gel strength.