THE REMOVAL OF NON-COLLAGEN COMPOSITION IN YELLOWFIN TUNA SKIN BY NaOH SOLUTION

Abstract

Yellowfin tuna (Thunnus albacares) skin, a by-product from the processing of frozen tuna fillet, can be used as raw material for collagen production. The removal of non-collagen composition in fish skin is very important in the extraction process of collagen. In this study, non-collagen on yellowfin tuna skin was removed with NaOH solution under the conditions of 1N NaOH concentration, 28-hours NaOH treatment time, NaOH/fish skin ratio (v/w) 5/1. The ratio of hydroxyproline/protein in the obtained collagen was 9.86%. The remaining fat content was 5.6% compared to dry matter.

Keywords: Collagen, non-collagen, hydroxyproline, yellowfin tuna skin.