Abstract

Tranformation of fish by-products to food and products with bioactivity brings economic benefits and reduces waste ratio in fishsery industry. This study focussed on the extraction and purification of protease from intestine of Basa catfish (Pangasius bocourti). The optimal conditions for protease extraction from Basa catfish intestine were as follows: intestine and buffer ratio-1/1(w/w); pH 9,5; temperature 35oC; extraction time is 10 minutes. Isopropanol was a suitable precipitating agent for protease purification. The optimal ratio of enzyme extract and iosopropanol was 15/85 (v/v). The alkaline protease recovery yield was 90,42% and the purity degree was 1,65.