Stabilized rice aleurone and preparation method thereof

A method for preparing rice aleurone, comprising the following steps:

• (1) after rice hulling and mechanical rice milling of paddy, obtaining rice and rice bran;
• classifying the rice bran into an aleurone component and a non-aleurone component by an air classifier, and further sieving and classifying the aleurone component to obtain crude rice aleurone;
• (2) mixing the crude rice aleurone obtained in step (1) with water to obtain a crude rice aleurone mixture, and subjecting the crude rice aleurone mixture to a steam treatment;
• (3) after the steam treatment, stirring the crude rice aleurone mixture with more water to obtain a rice aleurone slurry;
• and
• (4) adding the rice aleurone slurry to a drum scraper dryer, drying the rice aleurone slurry to obtain a dried rice aleurone, and then crushing the dried rice aleurone to obtain a rice aleurone product;
• wherein the aleurone component is further sieved and classified using an ultrasonic vibrating screen in the step (1), and a mesh number of the ultrasonic vibrating screen is in a range of 60-80 meshes;
• an amount of the water added is 5%-15% of mass of the crude rice aleurone in step (2);
• during the steam treatment, the crude rice aleurone mixture is distributed to a thickness of 1-5 cm in the step (2);
• a steam temperature during the steam treatment is controlled at 95° C.-120° C., and steam treatment time is 20-40 min in the step (2);
• a mass concentration of the rice aleurone slurry is 25%-50% in step (3);
• a steam pressure of the drum scraper dryer is 0.6-0.8 Mpa in step (4);
• and a motor speed of the drum scraper dryer is 50-300 rpm in the step (4).