Abstract: In this paper, the residual hydrogen peroxide from bleaching process of cotton knitted fabric were removed with catalase. Based on the research of single factor experiments, the optimum conditions for the removal of hydrogen peroxide with catalase were as follows: pH value 7 ～ 8, dosage of catalase 0.1 g/L, temperature 20 ℃, enzyme processing time 15 min, bath ratio 1∶15.

Key words: catalase; cotton knitted fabric; bleaching