Processing technology of selenium-rich kudzu root powder and selenium-rich kudzu root powder

Abstract

The present application relates to the processing technology field of radix puerariae whole powder, and particularly relates to a processing technology of selenium-rich radix puerariae whole powder and the selenium-rich radix puerariae whole powder, the processing technology comprising the following steps: S1, slicing cleaned and peeled radix puerariae in a low-temperature and low-oxygen environment to obtain radix puerariae slices; S2, sequentially performing vacuum microwave drying and low-temperature and low-dew-point airflow drying on the radix puerariae slices to reduce the water content to below 5%; S3, performing vortex pulverization on the dried radix puerariae slices in a low-temperature liquid medium immersion environment, and immediately obtaining radix puerariae whole powder with a target particle size through online airflow classification; the vacuum microwave drying conditions are that the vacuum degree is not less than-0.09 MPa, and the core temperature of the radix puerariae slices is not higher than 40 DEG C; the drying gas used in the low-temperature and low-dew-point airflow drying is nitrogen with a dew point lower than-40 DEG C, and the gas temperature is-10 DEG C to 0 DEG C. The present application can reduce the volatilization or oxidation of selenium in the radix puerariae whole powder, thereby improving the nutritional value of the radix puerariae whole powder.

Description

Technical Field

[0001] This invention relates to the field of kudzu root powder processing technology, and in particular to a processing technology for selenium-enriched kudzu root powder and the selenium-enriched kudzu root powder itself. Background Technology

[0002] Selenium-enriched kudzu refers to a special type of kudzu whose selenium content is significantly higher than that of ordinary kudzu through natural enrichment or artificial intervention (such as applying selenium-enriched fertilizers or foliar spraying with selenium solution). Kudzu root powder is a complete powder made from fresh kudzu roots through processes such as washing, peeling, slicing, drying, and grinding. It retains all the nutrients of kudzu root. Compared to refined kudzu root powder (which only extracts starch or puerarin), whole powder retains the dietary fiber, minerals, and vitamins of kudzu root, providing more comprehensive nutrition. Furthermore, the dried and ground powder is easier to store and transport. Kudzu root powder is soluble in water or milk and can be used to make beverages, pasta, pastries, etc., offering a delicate texture, unique flavor, and wide applicability.

[0003] Currently, in the grinding process of selenium-enriched kudzu root powder, the intense friction and collision between the grinding disc / hammer and the kudzu root slices generate a large amount of heat. Since kudzu root is a poor conductor of heat, this heat cannot dissipate quickly, creating localized high-temperature zones exceeding 50-60°C at the particle contact points. This localized, brief thermal shock is sufficient to partially oxidize and volatilize the selenium compounds in the kudzu root powder, and also damages other heat-sensitive nutrients. Furthermore, excessively high hot air drying temperatures (above 60°C) can damage heat-sensitive components in kudzu root, accelerating selenium volatilization or oxidation and leading to nutrient loss. Additionally, some processes can cause powder agglomeration or fibrosis, further reducing nutritional value and weakening functionality. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a processing technology for selenium-enriched kudzu root powder and the selenium-enriched kudzu root powder itself, which can reduce the volatilization or oxidation of selenium in kudzu root powder, thereby improving the nutritional value of kudzu root powder.

[0005] The present invention solves the above-mentioned technical problems through the following technical means:

[0006] A processing method for selenium-enriched kudzu root powder includes the following steps:

[0007] S1. Slice the cleaned and peeled kudzu root under low temperature and low oxygen conditions to obtain kudzu root slices.

[0008] S2. The kudzu root slices are subjected to vacuum microwave drying and low-temperature low-dew-point airflow drying in sequence to reduce their moisture content to below 5%.

[0009] S3. The dried kudzu root slices are subjected to vortex pulverization in a low-temperature liquid medium immersion environment, and the whole kudzu root powder with the target particle size is immediately obtained through online airflow classification.

[0010] Furthermore, the conditions for vacuum microwave drying are: vacuum degree not lower than -0.09 MPa, and core temperature of kudzu root slices not exceeding 40°C.

[0011] Furthermore, the drying gas used in the low-temperature, low-dew-point airflow drying is nitrogen with a dew point below -40°C and a gas temperature of -10°C to 0°C.

[0012] Furthermore, the kudzu root slices are treated with a high-intensity pulsed electric field before eddy current pulverization. In this technical solution, the high-intensity pulsed electric field can form reversible micropores on the cell membrane of kudzu root cells, weakening the structural integrity of the cell wall. After treatment with the high-intensity pulsed electric field, the intercellular connections of the kudzu root slices are weakened, and the mechanical strength decreases. This significantly reduces the mechanical force required for subsequent pulverization, thereby significantly reducing energy consumption. Moreover, the microporousization of the cell wall facilitates the release and absorption of intracellular nutrients (such as selenoproteins and polysaccharides) in the human body, enhancing the functionality of the product.

[0013] Furthermore, the electric field intensity of the high-intensity pulsed electric field treatment of the kudzu root slices is 2.0-3.5kV / cm, the number of pulses is 5-20, the pulse width is 20-50μs, and the pulse frequency is 1-10Hz.

[0014] Furthermore, the high-intensity pulsed electric field treatment method includes: laying kudzu root slices in a single layer on a pre-cooled conveyor belt under inert gas protection; setting the pulsed electric field treatment parameters and starting the cooling system to lower the temperature of the treatment chamber to 1-3℃; starting the conveyor belt and the pulse generator, with the conveyor belt continuously passing the kudzu root slices through the high-intensity pulsed electric field. This technical solution, through precise design of the electric field parameters and integration of a high-efficiency cooling system, achieves effective pulsed electric field pretreatment of kudzu root slices without causing a significant temperature rise. This solution is highly practical, can significantly reduce subsequent processing energy consumption, and can improve the quality of the final product.

[0015] Furthermore, the method in step S3 specifically includes:

[0016] S301. Introduce high-purity nitrogen (purity ≥ 99.99%) into the grinding chamber of the grinder to perform gas replacement until the oxygen concentration sensor in the chamber shows a stable concentration below 50 ppm and maintains a slightly positive pressure state.

[0017] S302. Inject a sufficient amount of food-grade cryogenic liquid medium (preferably anhydrous ethanol or liquid carbon dioxide) into the sealed cavity of the grinder; activate the liquid nitrogen cooling system integrated in the outer jacket or internal coil of the grinding cavity to powerfully cool the medium; monitor the medium temperature in real time through a temperature sensor, and adjust the liquid nitrogen injection amount through a PID control system to precisely stabilize the medium temperature within the range of -60℃ to -80℃; this temperature is far below the boiling point of the medium, ensuring that it remains in a liquid state throughout the entire grinding process.

[0018] S303. Kudzu root slices with a moisture content of less than 5% are continuously and uniformly fed into a grinding chamber filled with a cryogenic liquid medium under nitrogen protection. A high-speed vortex generator at the bottom or sidewall of the grinding chamber is activated, causing it to rotate at high speed within the medium. The high-speed rotating rotor generates intense shear flow, cavitation, and turbulence in the liquid medium. The kudzu root slices are engulfed and accelerated by these complex hydrodynamic forces, and undergo high-speed collisions and shearing with each other and with the rotor and stator, thus being broken down. Because the material is completely immersed in a large amount of cryogenic liquid medium, the frictional heat generated during grinding is instantly transferred and dispersed throughout the medium. By real-time temperature monitoring and dynamic adjustment of the liquid nitrogen cooling power, the temperature fluctuation of the medium is ensured to not exceed ±2℃. This achieves isothermal pulverization, ensuring that the temperature of the material particles remains below -50℃ at any local location, completely eliminating the generation of local hot spots in traditional dry grinding and fundamentally avoiding thermal damage to selenium and heat-sensitive components.

[0019] After grinding for 15-25 minutes, the "powder-liquid" mixture (slurry) containing kudzu root particles of different sizes is discharged from the bottom of the grinding chamber by a circulating pump and enters the gas-liquid mixer. In the gas-liquid mixer, the slurry is intensely mixed with a stream of ultra-low temperature, dry nitrogen gas that has been pre-cooled to below -50°C. The nitrogen gas carries the fine kudzu root particles out of the liquid medium, forming a gas-solid two-phase flow, while most of the liquid medium is separated and recycled back to the grinding chamber for reuse; the gas-solid two-phase flow carrying the kudzu root particles enters the online inertial airflow classifier tangentially at a high velocity.

[0020] S305. In the vortex field designed within the classifier, particles are subjected to a competitive interaction between centrifugal force and gas drag. Coarse particles and uncut fiber bundles, with their large mass and inertia, experience a greater centrifugal force than gas drag and are thrown against the classifier wall. They then automatically return to the grinding chamber for secondary pulverization via the coarse powder loop under gravity. Qualified fine powder (target particle size, such as 80-300 mesh), with its smaller mass, experiences a greater gas drag than centrifugal force and is carried by the airflow through the central outlet of the classifier into the cyclone collector. In the cyclone collector, the vast majority of qualified kudzu root powder is separated and collected under centrifugal force. The exhaust gas, containing a very small amount of ultrafine dust, enters a bag filter or membrane filter for final purification. The purified low-temperature nitrogen gas, after recovering its cooling capacity via a heat exchanger, is mostly re-entered into the system circulation, with a very small portion discharged to maintain system pressure balance, achieving closed-loop utilization of inert gas and significantly reducing costs.

[0021] Furthermore, before the material enters the high-speed vortex zone, it is first fully immersed in a low-temperature medium and pre-cooled to near the medium temperature to eliminate any residual heat.

[0022] Furthermore, the high-speed eddy current generator at the bottom or side wall of the grinding chamber is activated, causing it to rotate at high speed in the medium, with a linear speed of 20-50 m / s.

[0023] Secondly, the present invention also discloses a selenium-enriched kudzu root powder, which is prepared using the processing technology described above.

[0024] The selenium-enriched kudzu root powder prepared in this application has a high selenium retention rate, excellent color and nutritional quality, enhanced functionality, and improved storage stability.

[0025] The present application, employing the above-described scheme, has the following beneficial effects:

[0026] 1. This invention completely eliminates the risks of thermal damage and oxidation during processing through two core physical methods: combined vacuum microwave-low temperature airflow drying and low-temperature liquid medium immersion vortex pulverization. Microwave drying achieves rapid dehydration, while the low-temperature airflow completes deep drying, with the temperature remaining below 40°C throughout the process. Vortex pulverization is carried out in a liquid medium below -60°C, completely avoiding localized overheating. Under these combined effects, the selenium retention rate reaches over 95%, far exceeding that of traditional processes, and heat-sensitive components such as puerarin and polysaccharides are also protected to the greatest extent.

[0027] 2. The online airflow classification technology of this invention enables simultaneous crushing and classification; coarse particles are automatically separated and returned for re-crushing, ensuring that the final product has a highly concentrated particle size (80-300 mesh accounts for more than 85%). This not only avoids fiber residue and powder agglomeration, making kudzu root powder have a delicate taste and good mixing properties, but also significantly improves crushing efficiency and avoids energy waste and quality decline caused by over-crushing.

[0028] 3. This invention utilizes physical methods such as high-intensity pulsed electric field pretreatment to weaken cell structure and low-temperature pulverization to achieve efficient processing and stable product quality, aligning with the modern trend of "clean labels" for healthy foods. Simultaneously, the high-intensity pulsed electric field pretreatment reduces pulverization energy consumption by 20%-40%, and the inert gas closed-loop system minimizes cold loss. Overall, energy consumption is significantly lower than the traditional liquid nitrogen freezing + hot air drying process, demonstrating excellent prospects for industrial application. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] The present invention provides a processing method for selenium-enriched kudzu root powder, comprising the following steps:

[0031] S1. The cleaned and peeled kudzu root is sliced ​​by freezing it with liquid nitrogen in an anaerobic environment to obtain kudzu root slices.

[0032] S2. The kudzu root slices are subjected to vacuum microwave drying and low-temperature low-dew-point airflow drying in sequence to reduce their moisture content to below 5%.

[0033] S3. The dried kudzu root slices are subjected to high-intensity pulsed electric field treatment. Specifically, the kudzu root slices are laid in a single layer on a pre-cooled conveyor belt under inert gas protection; the pulsed electric field treatment parameters are set, the cooling system is started, and the temperature of the treatment chamber is reduced to 1-3℃; the conveyor belt is started, the pulse generator is started, and the conveyor belt continuously passes the kudzu root slices through the high-intensity pulsed electric field.

[0034] Then, eddy current pulverization is carried out in a low-temperature liquid medium immersion environment, and kudzu root powder with the target particle size is immediately obtained through online airflow classification; specifically:

[0035] S301. Introduce high-purity nitrogen gas (≥99.99%) into the grinding chamber of the grinder to perform gas replacement until the oxygen concentration sensor in the chamber shows a stable concentration below 50 ppm, and maintain a slightly positive pressure state.

[0036] S302. Inject a sufficient amount of food-grade cryogenic liquid medium (anhydrous ethanol or liquid carbon dioxide can be selected) into the sealed cavity of the grinder; start the liquid nitrogen cooling system integrated in the outer jacket or internal coil of the grinding cavity to powerfully cool the medium; monitor the medium temperature in real time through a temperature sensor, and adjust the liquid nitrogen injection amount through a PID control system to accurately stabilize the medium temperature within the range of -60℃ to -80℃; this temperature is far below the boiling point of the medium, ensuring that it remains in a liquid state throughout the entire grinding process;

[0037] S303. Kudzu root slices with a moisture content of less than 5% are continuously and uniformly fed into a grinding chamber filled with a cryogenic liquid medium under nitrogen protection. A high-speed vortex generator at the bottom or sidewall of the grinding chamber is activated, causing it to rotate at high speed within the medium. The high-speed rotating rotor generates intense shear flow, cavitation, and turbulence in the liquid medium. The kudzu root slices are engulfed and accelerated by these complex hydrodynamic forces, and undergo high-speed collisions and shearing with each other and with the rotor and stator, thus being broken up. Real-time temperature monitoring and dynamic adjustment of the liquid nitrogen cooling power ensure that the medium temperature fluctuation does not exceed ±2℃.

[0038] S304 After pulverizing for 15-25 minutes, the slurry containing kudzu root particles of different sizes is discharged and enters the gas-liquid mixer; the slurry is strongly mixed with a stream of ultra-low temperature and dry nitrogen pre-cooled to below -50℃, and the gas-solid two-phase flow carrying the kudzu root particles enters the online inertial airflow classifier tangentially.

[0039] S305. Inside the classifier, the coarse powder is pulverized a second time; the qualified fine powder is carried by the airflow and enters the cyclone collector through the classifier outlet. In the cyclone collector, the whole kudzu powder is separated and collected under the action of centrifugal force.

[0040] Example 1

[0041] This embodiment uses the lower limit value of the process parameters, specifically:

[0042] High-intensity pulsed electric field preprocessing parameters: electric field strength 2.0 kV / cm, number of pulses 5, pulse width 20μs, frequency 1Hz.

[0043] Combined drying parameters: vacuum microwave drying to a moisture content of 35% (vacuum degree -0.09MPa, kudzu root slice temperature 38℃); low temperature airflow drying to a moisture content of 4.8% (nitrogen temperature -10℃, dew point -42℃).

[0044] Vortex pulverization parameters: medium is liquid carbon dioxide, temperature is -60℃, vortex linear velocity is 20m / s, and pulverization time is 25min.

[0045] Online grading target: collect 80-150 mesh powder.

[0046] Results: The selenium retention rate of the selenium-enriched kudzu powder obtained in this embodiment was 92.5%, the unit energy consumption of the pulverizing process was 75% of that of traditional dry grinding, and the proportion of 80-150 mesh particles in the finished product was 80.3%.

[0047] Example 2

[0048] This embodiment uses intermediate values ​​of process parameters, specifically:

[0049] High-intensity pulsed electric field preprocessing parameters: electric field strength 2.8 kV / cm, number of pulses 12, pulse width 35μs, frequency 5Hz.

[0050] Combined drying parameters: vacuum microwave drying to a moisture content of 32% (vacuum degree -0.095MPa, kudzu root slice temperature 35℃); low temperature airflow drying to a moisture content of 4.5% (nitrogen temperature -5℃, dew point -45℃).

[0051] Eddy current pulverization parameters: medium temperature -70℃, eddy current linear velocity 35m / s, pulverization time 20min.

[0052] Online grading target: collect 150-250 mesh powder.

[0053] Results: The selenium retention rate of the selenium-enriched kudzu powder obtained in this embodiment was 96.8%, the unit energy consumption of the pulverizing process was 60% of that of traditional dry grinding, the proportion of 150-250 mesh particles in the finished product was 88.5%, and the puerarin retention rate reached 95.2%.

[0054] Example 3

[0055] This embodiment uses the upper limit of the process parameters, specifically:

[0056] High-intensity pulsed electric field preprocessing parameters: electric field strength 3.5 kV / cm, number of pulses 20, pulse width 50μs, frequency 10Hz.

[0057] Combined drying parameters: vacuum microwave drying to a moisture content of 30% (vacuum degree -0.10MPa, kudzu root slice temperature 33℃); low temperature airflow drying to a moisture content of 4.0% (nitrogen temperature 0℃, dew point -48℃).

[0058] Eddy current pulverization parameters: medium temperature -80℃, eddy current linear velocity 50m / s, pulverization time 15min.

[0059] Online grading target: collect 250-300 mesh powder.

[0060] Results: The selenium retention rate of the selenium-enriched kudzu powder obtained in this embodiment was 95.5% (due to the high pulse energy input, there was a slight temperature rise, so the retention rate was slightly lower than that in Example 2). The unit energy consumption of the pulverizing process was 55% of that of traditional dry grinding. The proportion of 250-300 mesh particles in the finished product was 85.7%, and the powder had excellent flowability.

[0061] Comparative Example 1

[0062] This embodiment uses traditional hot air drying + dry grinding.

[0063] Process: Dry the kudzu root slices in a 70℃ hot air drying oven until the moisture content is less than 5%, and then pulverize them at room temperature using a common universal pulverizer until they pass through an 80-mesh sieve.

[0064] Results: The selenium retention rate of the obtained kudzu root powder was only 68.4%, the product was yellow in color, had a distinct burnt smell, the puerarin retention rate was less than 70%, and the powder agglomerated severely.

[0065] Comparative Example 2

[0066] This embodiment, based on the present invention, removes the high-intensity pulsed electric field pretreatment.

[0067] Process: Except for not performing high-intensity pulsed electric field pretreatment, the other steps and parameters are exactly the same as in Example 2.

[0068] Results: The selenium retention rate of the obtained kudzu root powder was 95.1% (indicating that low-temperature grinding itself is effective), but the energy consumption per unit of the grinding process was 85% of that of traditional dry grinding, which is about 25% higher than that of Example 2. This proves that high-intensity pulsed electric field pretreatment has a significant effect on reducing energy consumption.

[0069] Comparative Example 3

[0070] This embodiment eliminates the need for online grading (i.e., collecting all powder at once) based on the present invention.

[0071] Process: Except that all the slurry after vortex crushing is collected without classification, the other steps and parameters are exactly the same as in Example 2.

[0072] Results: The selenium retention rate of the obtained kudzu root powder was 96.5%, but the particle size distribution of the product was extremely wide (30-300 mesh), with coarse particles and ultrafine powder coexisting, giving it a gritty feel. The powder was also prone to absorbing moisture and clumping. The proportion of powder with a target particle size of 150-250 mesh was only 45.2%, far lower than in Example 2.

[0073] Comparative Example 4

[0074] This embodiment uses liquid nitrogen rapid freezing instead of programmed freezing.

[0075] Process: Peeled kudzu root is directly immersed in liquid nitrogen (-196℃) for 120 seconds to freeze, then thawed and sliced. Subsequent steps are the same as in Example 2.

[0076] Results: Microscopic observation revealed severe cell rupture in the kudzu root. Although the selenium retention rate remained at 90.2% after drying and pulverizing, the product exhibited poor rehydration properties and low nutrient dissolution rate, indicating that the damage to the cell structure affected the functionality of the final product.

[0077] The experimental results of the above embodiments are all averaged results from three experiments. The above embodiments and comparative examples fully demonstrate that the present invention, through the synergistic effect of pulsed electric field pretreatment, combined physical drying, low-temperature immersion eddy current pulverization, and online airflow classification, significantly reduces energy consumption while ensuring extremely high selenium retention and nutritional quality, and obtains selenium-enriched kudzu root powder with uniform particle size and superior functionality. The overall effect is far superior to traditional processes or comparative schemes lacking any core step.

[0078] It should be noted that: for experimental steps or conditions not specified in the examples, the procedures and conditions described in conventional experimental procedures in the literature of this art can be followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0079] The above examples are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by anyone under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the scope of protection of the present invention.

Claims

1. A processing technology for selenium-enriched kudzu root powder, characterized in that, Includes the following steps: S1. Slice the cleaned and peeled kudzu root under low temperature and low oxygen conditions to obtain kudzu root slices. S2. The kudzu root slices are subjected to vacuum microwave drying and low-temperature low-dew-point airflow drying in sequence to reduce their moisture content to below 5%. S3. The dried kudzu root slices are subjected to vortex pulverization in a low-temperature liquid medium immersion environment, and the whole kudzu root powder with the target particle size is immediately obtained through online airflow classification.

2. The processing technology of selenium-enriched kudzu root powder according to claim 1, characterized in that, The conditions for vacuum microwave drying are: vacuum degree not lower than -0.09 MPa, and core temperature of kudzu root slices not exceeding 40℃.

3. The processing technology of selenium-enriched kudzu root powder according to claim 1, characterized in that, The drying gas used in the low-temperature, low-dew-point airflow drying is nitrogen with a dew point below -40°C and a gas temperature of -10°C to 0°C.

4. The processing technology for selenium-enriched kudzu root powder according to any one of claims 1-3, characterized in that, Before the kudzu root slices are subjected to eddy current pulverization, they are treated with a high-intensity pulsed electric field.

5. The processing technology of selenium-enriched kudzu root powder according to claim 4, characterized in that, The electric field intensity of the high-intensity pulsed electric field treatment of the kudzu root slices is 2.0-3.5kV / cm, the number of pulses is 5-20, the pulse width is 20-50μs, and the pulse frequency is 1-10Hz.

6. The processing technology of selenium-enriched kudzu root powder according to claim 5, characterized in that, The method for high-intensity pulsed electric field treatment includes: laying kudzu root slices in a single layer on a pre-cooled conveyor belt under inert gas protection; setting pulsed electric field treatment parameters, starting the cooling system to reduce the temperature of the treatment chamber to 1-3℃; starting the conveyor belt, starting the pulse generator, and the conveyor belt continuously passing the kudzu root slices through the high-intensity pulsed electric field.

7. The processing technology of selenium-enriched kudzu root powder according to any one of claims 1-3, characterized in that, The method in step S3 specifically includes: S301. Introduce high-purity nitrogen into the grinding chamber of the grinder for gas replacement until the oxygen concentration sensor in the chamber shows a stable concentration below 50 ppm and maintains a slightly positive pressure state. S302. Inject a sufficient amount of food-grade cryogenic liquid medium into the sealed cavity of the grinder; start the liquid nitrogen cooling system integrated in the outer jacket or internal coil of the grinding cavity to powerfully cool the medium; monitor the medium temperature in real time and stabilize the medium temperature within the range of -60℃ to -80℃ by adjusting the amount of liquid nitrogen injected. S303. Kudzu root slices with a moisture content of less than 5% are continuously and uniformly fed into a grinding chamber filled with a low-temperature liquid medium under nitrogen protection; the high-speed eddy current generator of the grinding chamber is started to make it rotate and break it at high speed in the medium. S304 After pulverizing for 15-25 minutes, the slurry containing kudzu root particles of different sizes is discharged and enters the gas-liquid mixer; the slurry is strongly mixed with a stream of ultra-low temperature and dry nitrogen pre-cooled to below -50℃, and the gas-solid two-phase flow carrying the kudzu root particles enters the online inertial airflow classifier tangentially. S305. Inside the classifier, the coarse powder is pulverized a second time; the qualified fine powder is carried by the airflow and enters the cyclone collector through the classifier outlet. In the cyclone collector, the whole kudzu powder is separated and collected under the action of centrifugal force.

8. The processing technology of selenium-enriched kudzu root powder according to claim 7, characterized in that, Before the material enters the high-speed vortex zone, it is first fully immersed in a low-temperature medium and pre-cooled to near the medium temperature to eliminate any residual heat.

9. The processing technology of selenium-enriched kudzu root powder according to claim 8, characterized in that, Start the high-speed eddy current generator at the bottom or side wall of the grinding chamber to make it rotate at high speed in the medium, with a linear speed of 20-50 m / s.

10. A selenium-enriched kudzu root powder, characterized in that, It is prepared using the processing technology of selenium-enriched kudzu root powder as described in any one of claims 1-9.