Stabilized rice aleurone and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11980216-B2
Application number	US-202017117051-A
Country	US
Kind code	B2
Filing date	Dec 9, 2020
Priority date	Oct 10, 2019
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

The disclosure discloses stabilized rice aleurone and a preparation method, using the technology of classifying a rice aleurone layer by a tangential injection airflow impeller classifier combined with an ultrasonic vibrating screen for the first time, and simultaneously uses steam treatment coupled with thermal enzyme inactivation by drum drying as a stabilization method to prepare the stabilized rice aleurone for the first time. The drum drying equipment realizes the two purposes of enzyme inactivation and drying, and the method has the advantages of short process flow, simple equipment, high utilization rate, small floor space, low investment, low energy consumption and no pollution, and is suitable for industrial promotion. The stabilized rice aleurone has high nutritional value, is rich in functional ingredients, and can be used as a raw material for functional food development in industrial production and food applications.

First claim

What is claimed is:

1. 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).

2. 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.

3. The method of claim 2 , wherein the mechanical milling comprises milling by an emery roll rice mill process and/or an iron roll rice mill process in the step (1).

4. The method of claim 2 , wherein the air classifier is a tangential injection airflow impeller pneumatic classifier.

5. The method of claim 4 , wherein the tangential injection airflow impeller pneumatic classifier comprises tangential single-hole air injection or multi-hole air injection.

6. The method of claim 2 , wherein the aleurone component is further sieved and classified using an ultrasonic vibrating screen in the step (1).

7. The method of claim 6 , wherein a mesh number of the ultrasonic vibrating screen is in a range of 60-80 meshes.

8. The method of claim 2 , wherein an amount of the water added is 5%-15% of mass of the crude rice aleurone in step (2).

9. The method of claim 2 , wherein the steam treatment is to distribute the crude rice aleurone mixture to a thickness of 1-5 cm in step (2).

10. The method of claim 2 , wherein a steam temperature during the steam treatment is controlled at 95° C.-120° C., and steam treatment time is 20-40 min in step (2).

11. The method of claim 2 , wherein a mass concentration of the rice aleurone slurry is 25%-50% in step (3).

12. The method of claim 2 , wherein the stirring further comprises a colloid milling treatment to obtain a more delicate rice aleurone slurry in step (3).

13. The method of claim 2 , wherein a steam pressure of the drum scraper dryer is 0.6-0.8 Mpa in step (4).

14. The method of claim 2 , wherein a motor speed of the drum scraper dryer is 50-300 rpm in step (4).

15. The method of claim 2 , wherein a pulverization method adopted in step (4) is ultrafine pulverization, and a pulverization mesh number is 100-300 meshes.

Assignees

• Jiangsu State Farm Cereals Ind Group Co Ltd
• Univ Jiangnan
• Jiangsu Provincial Agricultural Reclamation And Dev Co Ltd

Inventors

• Wang Li
• Lu Hui
• Xu Zhicun
• Chen Zhengxing
• Zong Zhaoqin
• Li Yongfu
• Feng Xiaoyu
• Jiang Jie
• Zhang Congnan
• Xu Haifeng
• Feng Ru

Classifications

• A23B2/945

  Drum- or roller-drying · CPC title

• A23B2/94

  Thin-layer drying, drum drying or roller drying · CPC title

• A23L7/115 Primary

  Cereal fibre products, e.g. bran, husk · CPC title

• A23L3/485

  Human Necessities · mapped topic

• A23L5/23 Primary

  by extraction with solvents · CPC title