CN-122006850-A - Germ wheat core powder grinding process with high germ retention rate

CN122006850ACN 122006850 ACN122006850 ACN 122006850ACN-122006850-A

Abstract

The invention belongs to the technical field of germ wheat core powder grinding processes, and particularly relates to a germ wheat core powder grinding process with high germ retention rate, which is characterized by selecting hard wheat with a volume weight of more than or equal to 790g/L and an initial germ integrity rate of more than or equal to 92%, carrying out tempering treatment on the selected hard wheat, controlling the moisture content of the tempered wheat to be 14-16%, sequentially regulating the tempering temperature according to a gradient of 30-35-38 ℃, wherein the total tempering time is 4-4.5 h, carrying out 2-3 times of grinding on the tempered wheat, controlling the grinding speed to be 200-280 r/m and the grinding pressure to be 0.1-0.25 MPa, carrying out winnowing treatment on the ground material, controlling the winnowing wind speed to be 5-7 m/s, then sieving the wheat core powder respectively, sieving the wheat core powder through a 120-mesh sieve, and finally obtaining a product with a germ retention rate of more than or equal to 85% and a vitamin E retention rate of more than or equal to 90%.

Inventors

ZHANG SIHONG
ZHANG HONGGEN
SHAO QISHAN

Assignees

安徽金海面业股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (9)

1. A germ wheat core powder grinding process with high germ retention rate is characterized by comprising the following steps of selecting hard wheat with a volume weight of more than or equal to 790g/L and an initial germ integrity rate of more than or equal to 92%; Tempering the selected hard wheat, controlling the moisture of the tempered wheat to be 14% -16%, and sequentially regulating and controlling the tempering temperature according to the gradient from 30 ℃ to 35 ℃ to 38 ℃ for 4-4.5 hours; Grinding the tempered wheat for 2-3 times, wherein the grinding rotating speed is controlled to be 200-280 rpm and the grinding pressure is controlled to be 0.1-0.25 MPa in the grinding process; Carrying out air separation treatment on the ground materials, controlling the air separation speed to be 5m/s-7m/s, and then sieving respectively, wherein wheat core powder passes through a 120-mesh sieve, and germ passes through an 80-mesh sieve, and the germ retention rate of the product finally obtained by the process is more than or equal to 85%, and the vitamin E retention rate is more than or equal to 90%.
2. The germ wheat core powder grinding process with high germ retention rate according to claim 1, wherein in the first step, the hard wheat is winter wheat, spring wheat or a mixed raw material of winter wheat and spring wheat, the winter wheat is selected from the group consisting of the wheat 34 with a volume weight of 790g/L and an initial germ integrity rate of 92%, the spring wheat is selected from the group consisting of the wheat 44 with a volume weight of 800g/L and an initial germ integrity rate of 93%, and the mixed raw material is prepared by mixing the wheat 34 with the wheat 44 according to a ratio of 1:1, wherein the volume weight of the wheat 34 is 795g/L and the initial germ integrity rate of 92.5%.
3. The germ wheat core flour grinding process with high germ retention rate according to claim 2 is characterized in that in the second step, when winter wheat is used as a raw material, the moisture of the wheat after tempering is controlled to be 14%, the total tempering time is controlled to be 4h, when spring wheat is used as the raw material, the moisture of the wheat after tempering is controlled to be 15%, the total tempering time is controlled to be 4h, when mixed raw material is used as the raw material, the moisture of the wheat after tempering is controlled to be 15%, the total tempering time is controlled to be 4h, and when germ elasticity is required to be further enhanced, the total tempering time is prolonged to be 4.5h, and the moisture of the wheat after tempering is increased to be 16%.
4. The germ wheat core powder grinding process with high germ retention rate according to claim 3, wherein in the third step, specific parameters of the multistage light grinding are as follows, If the raw material is winter wheat, the primary grinding speed is 200 rpm, the pressure is 0.1MPa, the secondary grinding speed is 250rpm, the pressure is 0.2MPa, and if the raw material is spring wheat, the primary grinding speed is 250rpm, the pressure is 0.15MPa, the secondary grinding speed is 280 rpm, and the pressure is 0.25MPa; if the grinding is performed for 3 times, the primary grinding speed is 250 rpm, the pressure is 0.15MPa, the secondary grinding speed is 280 rpm, the pressure is 0.25MPa, and the tertiary grinding speed is 220 rpm, and the pressure is 0.15MPa.
5. The germ wheat core powder grinding process with high germ retention rate according to claim 4, wherein in the fourth step, when the raw material is winter wheat, the air separation speed is controlled to be 5m/s, when the raw material is spring wheat or mixed raw material, the air separation speed is controlled to be 6m/s, and when the enhanced impurity removal is needed to improve the purity of the wheat core powder, the wheat core powder is screened by a 120-mesh sieve for 2 times.
6. The germ wheat core powder grinding process with high germ retention rate according to claim 5, wherein the whole process of the grinding process has the highest temperature of less than or equal to 45 ℃ and the grinding pressure of less than or equal to 0.3MPa.
7. The germ wheat core powder grinding process with high germ retention rate according to claim 6, wherein the purity of the wheat core powder is more than or equal to 90%, the purity of the germ is more than or equal to 95%, the vitamin E content is more than or equal to 27.9mg/100g, and when the raw materials are mixed raw materials, the vitamin E content is more than or equal to 31.5mg/100g and the purity of the wheat core powder is more than or equal to 95%.
8. The germ wheat core powder grinding process with high germ retention rate according to claim 7, wherein the equipment used in the process comprises a roller mill, a winnowing machine and a fluidized bed dryer which are all conventional grain processing equipment.
9. The germ wheat core powder grinding process with high germ retention rate according to claim 8 is characterized in that the process can adapt to different application scenes, winter wheat or spring wheat is selected as a raw material to be ground for 2 times when the process is used for conventional high-end-face powder production, winter wheat is selected as a raw material to be ground for 3 times when the process is used for infant complementary food raw material production, tempering time is prolonged, and mixed raw materials are selected as raw materials to be ground for 3 times when the process is used for large-scale mass production to balance quality and cost.

Description

Germ wheat core powder grinding process with high germ retention rate Technical Field The invention belongs to the technical field of germ wheat core powder grinding processes, and particularly relates to a germ wheat core powder grinding process with high germ retention rate. Background The traditional germ wheat core powder grinding process has the problems that the germ retention rate is generally lower than 30%, the loss of key nutritional ingredients such as vitamin E is serious, the loss rate is higher than 25%, the process mainly adopts a grinding mode with high rotating speed and high pressure, unreasonable tempering parameters are matched, the complete structure of the wheat germ can be damaged due to strong mechanical force and high temperature generated in the grinding process, the germ is broken and lost, the nutritional ingredients are degraded, meanwhile, the existing process has poor suitability for raw materials, the process parameters are difficult to adjust according to the difference of the toughness of the germ and the hardness of endosperm of winter wheat and spring wheat, the phenomenon of adhesion between the wheat core and wheat bran easily occurs, the purity of the wheat core powder is difficult to reach more than 90%, the severe requirement of high-end foods such as infant complementary foods on the purity of the raw materials cannot be met, in addition, the process for partially pursuing the high purity also needs to rely on customized equipment, the transformation cost is high, the production cycle is long, the lack of flexibility is difficult to consider the balance requirements on quality and cost under different production scenes, and the mass scale restriction of the high-nutrition germ powder is difficult to realize. Disclosure of Invention The invention aims at solving the technical problems and provides a germ wheat core powder grinding process with high germ retention rate. In view of the above, the invention provides a germ wheat core powder grinding process with high germ retention rate, which comprises the following steps of selecting hard wheat with a volume weight of more than or equal to 790g/L and an initial germ integrity rate of more than or equal to 92%; Tempering the selected hard wheat, controlling the moisture of the tempered wheat to be 14% -16%, and sequentially regulating and controlling the tempering temperature according to the gradient from 30 ℃ to 35 ℃ to 38 ℃ for 4-4.5 hours; Grinding the tempered wheat for 2-3 times, wherein the grinding rotating speed is controlled to be 200-280 rpm and the grinding pressure is controlled to be 0.1-0.25 MPa in the grinding process; Carrying out air separation treatment on the ground materials, controlling the air separation speed to be 5m/s-7m/s, and then sieving respectively, wherein wheat core powder passes through a 120-mesh sieve, and germ passes through an 80-mesh sieve, and the germ retention rate of the product finally obtained by the process is more than or equal to 85%, and the vitamin E retention rate is more than or equal to 90%. Preferably, the hard wheat in the first step is winter wheat, spring wheat or a mixed raw material of winter wheat and spring wheat, wherein the winter wheat is selected from the group consisting of the relaxation wheat 34, the volume weight of the relaxation wheat is 790g/L, the initial germ integrity rate is 92%, the spring wheat is selected from the group consisting of the Ji wheat 44, the volume weight of the Ji wheat 44 is 800g/L, the initial germ integrity rate is 93%, the mixed raw material is that the relaxation wheat 34 and the Ji wheat 44 are mixed according to a ratio of 1:1, the volume weight of the mixture is 795g/L, and the initial germ integrity rate is 92.5%. Preferably, in the second step, when the raw material is winter wheat, the moisture of the wheat after tempering is controlled to be 14%, the total tempering time is 4 hours, when the raw material is spring wheat, the moisture of the wheat after tempering is controlled to be 15%, the total tempering time is 4 hours, when the raw material is mixed raw material, the moisture of the wheat after tempering is controlled to be 15%, the total tempering time is 4 hours, and when the elasticity of the embryo is required to be further enhanced, the total tempering time is prolonged to be 4.5 hours, and the moisture of the wheat after tempering is increased to be 16%. Preferably, in the third step, specific parameters of the multistage light mill are as follows, If the raw material is winter wheat, the primary grinding speed is 200 rpm, the pressure is 0.1MPa, the secondary grinding speed is 250rpm, the pressure is 0.2MPa, and if the raw material is spring wheat, the primary grinding speed is 250rpm, the pressure is 0.15MPa, the secondary grinding speed is 280 rpm, and the pressure is 0.25MPa; if the grinding is performed for 3 times, the primary grinding speed is 250 rpm, the pressure is 0.15MPa, the secondary grinding