Objective:To reduce the content of cadmium and phytic acid and enhance the utilization value of rice bran powder.Methods:To optimize the treatment process of citric acid and phytase through single factor and response surface methodology and to achieve the reduction of cadmium and phytic acid in rice bran.Results:Using ultrasonic assisted citric acid process , under the conditions of citric acid concentration 0.08 mol/L ,rice bran suspension pH 3 , 43 ℃,and 50 minutes ,the elimination rate of heavy metal cadmium reached 99.98％.Under the conditions of 0.10％ phytase addition ,1:10 g/mL solid-liquid ratio ,pH 6.2 ,50 ℃,and treatment for 98 min ,the phytic acid elimination rate reached 98.68％.Conclusion:After this process ,the residual cadmium in rice bran powder is 0.00076 mg/kg ,and the residual phytic acid is 0.763 g/kg ,which met the national standards.The protein and starch content in the rice bran powder increased ,and the starch digestibility increased.
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