Effect of conditioning treatment parameters of cellulases solution on milling characteristics of brown rice

Abstract

A new enzymatic pre-treatment method for improving milling characteristics was studied by spraying cellulases solution on brown rice. The effects of enzymatic pre-treatment parameters on milling characteristics of brown rice were analyzed by response surface methodology. The optimum milling characteristic was obtained under cellulases concentration of 117.4 mg/mL, interval time of 77.2 min and temperature of 35.5 °C. Validation experiments indicated that head rice yield and milling energy consumption were respectively 4.59% higher and 32.95% lower than the values for untreated samples, 1.83% higher and 8.10% lower than those of moisture conditioning treatment. The breaking force and surface structure of the brown rice by enzymatic pre-treatment were studied to reveal the mechanism of change for milling characteristics.