Optimization of preparing crude microcrystalline cellulose from okara by response surface methodology
In this study,crude microcrystalline cellulose(CMCC)was prepared from soybean residue(okara)through combined treatment of potassium hydroxide and wet-process phosphoric acid.The crys-tallinity index was chosen as the response value and single factor experiments,Plackett-Burman experi-ments,and response surface methodology were used to optimize process conditions.The results suggested that alkali treatment temperature,acid treatment temperature,and acid treatment time had a significant impact on crystallinity index of CMCC and the optimal process conditions were identified as alkali treat-ment temperature 90 ℃,alkali treatment time 60 min,potassium hydroxide solution concentration 4％,wet-process phosphoric acid concentration 35％(P2O5),acid treatment time 60 min,and acid treatment temperature 95 ℃.The confirmatory experiment indicated the crystallinity index of CMCC was 42.89％under optimal conditions,which was only 0.12 percentage points lower than the predicted value,indica-ting that the optimization results obtained by the response surface optimization method are reasonable and feasible.
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