Abstract: In order to extract insoluble dietary fiber from coconut residue,monofactorial tests were carried out based on component analysis of coconut residue to determine the appropriate levels of factors influencing proteolysis and adipolysis,orthogonal test was accomplished to optimize technological conditions of one-step zymohydrolysis and the product’s function was determined too. Results indicated that coconut residue contains 14.8% protein,35.5% fat,22.3% dietary fiber and 20.8% other carbohydrates; The appreciate conditions of proteolysis and adipolysis are pH 8.0～9.0,enzyme dosage 5.0%～6.0%,45～ 55℃ and reaction time 4.0～5.0h,and pH 7.0～9.0,enzyme dosage 5.0%～6.0%,40～45℃ and reaction time 4.0～5.0 h respectively; The optimized conditions of one-step zymohydrolysis are pH 8.5,enzyme dosage 5.5%,48℃ and reaction time 3.5 h and the removal rates of protein and lipid are 89.1% and 83.6% respectively; The water holdup,swelling rate,viscosity and purity of IDF product are 3.25g/g,3.45ml/g and 1.66mPa·s and 80.3% respectively.

Key words: coconut residue, insoluble dietary fiber, enzymatic extraction