Processing technological process and preparation method of rumex hanus dried powder
By employing a multi-step processing technique and appropriate drying methods, the problems of uneven drying, nutrient loss, and unstable color in edible grass powder have been solved, enabling the production of high-quality and stable edible grass powder suitable for the food, health product, and feed industries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-04-07
AI Technical Summary
The existing production process for dried leaf grass powder has problems such as uneven drying, loss of nutrients, unstable product color, and excessive microorganisms, which leads to a shortened shelf life and unstable quality.
The process employs a multi-step approach, including raw material handling, cleaning and disinfection, color protection, segmented drying, pulverizing and sieving, and packaging and sterilization. In accordance with food safety regulations, low-temperature vacuum drying and solar drying are used to ensure nutrient retention and product stability.
It achieves uniform drying of leafy grass powder, preservation of nutrients, stable color, and compliance with microbial indicators, extending the product's shelf life and making it suitable for large-scale production.
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of food processing, and particularly relates to a processing process of leafy vegetable dried powder and a preparation method thereof. BACKGROUND
[0002] Leafy vegetables are rich in protein, vitamins, minerals and various active ingredients, and have high nutritional value and application value. The leafy vegetables are processed into dried powder, which can prolong the shelf life, facilitate storage and transportation, and can be widely applied to the fields of food, health products and feed.
[0003] The existing processing process of leafy vegetable dried powder has single drying temperature, which leads to too fast drying of the surface of raw materials or difficulty in releasing the internal moisture, and uneven drying. High-temperature long-time drying is easy to cause loss of heat-sensitive nutrients and yellowing and darkening of the product. In addition, improper color protection treatment or improper color protection method affects the appearance quality of the product. At the same time, the unstrict hygiene control in some processes is easy to cause problems such as microbial overproof and secondary pollution, which leads to shortening of the shelf life of the product and instability of the quality.
[0004] Therefore, there is an urgent need for a processing process of leafy vegetable dried powder which has precise process parameters, good nutrient retention, stable quality and can be mass-produced. SUMMARY
[0005] In order to solve the above-mentioned problems, the application provides a processing process of leafy vegetable dried powder and a preparation method thereof, which can meet the requirements of mass production and high quality, have high practicability, improve the stability of the finished product, ensure the color of the product, and balance the nutrient retention and production cost.
[0006] The technical scheme adopted by the application is as follows: the processing process of leafy vegetable dried powder comprises the following steps:
[0007] S1, raw material treatment and selection: selecting leafy vegetables in the tender leaf stage which grow vigorously and have no pests and diseases for harvesting, removing yellow leaves, old leaves, diseased leaves, weeds and stems, and only keeping high-quality leaf blades or part of the tender stems;
[0008] S2, cleaning and disinfection: cleaning the selected leafy vegetables by a bubble cleaning machine or running water to remove dust, sand, insect eggs and other impurities attached to the surface, and short-time soaking disinfection by using food-grade low-concentration ozone water or sodium hypochlorite solution to reduce the microbial load;
[0009] S3, draining and cutting: removing the excess moisture of the cleaned leafy vegetables by a vibration water draining machine or a centrifugal drying machine to shorten the drying time and save energy, and cutting the leafy vegetables into 3-5cm segments to increase the heating area and make the drying more uniform and faster;
[0010] S4. Color protection treatment: Blanch the chopped leafy greens in boiling water for 15-30 seconds. Blanching will cause some loss of water-soluble vitamins, but it can better fix the color and deactivate enzymes. After blanching, cool them quickly with cold water and drain.
[0011] S5. Drying: Use drying equipment to dry the drained leafy grass until the moisture content drops below 8%;
[0012] S6. Discharge Cooling: The dried leafy grass should be removed from the drying equipment immediately and placed in a dry and clean environment for natural or forced cooling.
[0013] S7. Crushing and sieving: The cooled hay pieces are first coarsely crushed using a hammer mill, and then finely ground using a vibratory mill, ultrafine mill or air jet mill to obtain fine powder. The ground powder is then sieved through an 80-120 mesh vibrating screen.
[0014] S8. Packaging and sterilization: Weighing, filling and sealing are performed using an automatic packaging machine, and the packaged products are irradiated with cobalt-60 or an electron beam.
[0015] S9. Finished Product Inspection and Warehousing: Sampling inspections are conducted on finished products. After passing the inspection, labels are affixed and the products are stored in the warehouse.
[0016] Furthermore, in step S1, the edible grass should be harvested on a sunny morning to avoid harvesting on rainy days, as the moisture content of the edible grass is too high on rainy days.
[0017] Furthermore, the leafy greens that have been soaked and disinfected in step S2 are thoroughly rinsed with clean water to remove any residual ozone water or sodium hypochlorite solution.
[0018] Furthermore, the color-protecting treatment in step S4 also includes soaking in a 0.5%-1% sodium bicarbonate solution or color-protecting agent solution for 5-10 minutes.
[0019] Furthermore, step S5 includes hot air drying, vacuum freeze drying, and solar drying. Hot air drying is carried out in stages, with the temperature decreasing sequentially in the initial, middle, and later stages. Vacuum freeze drying uses a low-temperature vacuum environment to allow the moisture in the leafy grass to directly sublimate from ice into water vapor. Solar drying involves constructing a solar drying greenhouse to dry the drained leafy grass using sunlight.
[0020] Furthermore, in step S7, the material on the vibrating screen is returned to the pulverizer for re-pulverization and then sieved again through an 80-120 mesh vibrating screen to ensure that the powder fineness is uniform.
[0021] Furthermore, the main indicators for sampling inspection include: moisture content, microbial indicators, color, odor, and fineness, and it has good light-blocking and sealing properties to prevent moisture absorption and oxidation.
[0022] Furthermore, in step S8, food-grade aluminum foil bags, composite plastic bags, or tin cans are used for packaging.
[0023] The beneficial effects achieved by the present invention using the above preparation method are as follows:
[0024] 1. Color protection treatment prevents leafy greens from turning yellow or dark during the drying process due to enzymatic browning and chlorophyll degradation, ensuring product color while also preserving nutrients and reducing production costs.
[0025] 2. From cleaning to packaging, all steps must comply with food safety production standards to prevent secondary contamination, ensure that microbial indicators meet standards, and extend the product's shelf life.
[0026] 3. Different drying processes can be flexibly selected according to production scale and product positioning, taking into account both large-scale production and high-quality requirements, making it highly practical. Detailed Implementation
[0027] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.
[0028] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.
[0029] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.
[0030] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.
[0031] Example 1
[0032] A processing flow and preparation method for dried leafy grass powder includes the following steps:
[0033] S1. Raw material processing and selection: Select vigorous, disease-free tender leafy grasses for harvesting, remove yellow leaves, old leaves, diseased leaves, weeds and stems, and retain only high-quality leaves or some tender stems.
[0034] S2. Cleaning and disinfection: The selected leafy greens are cleaned with a bubble cleaner or running water to remove dust, mud, insect eggs and other impurities attached to the surface. They are then briefly soaked in food-grade low-concentration ozone water or sodium hypochlorite solution to reduce the microbial load. After soaking and disinfection, the leafy greens are thoroughly rinsed with clean water to remove any residual ozone water or sodium hypochlorite solution.
[0035] S3. Draining and cutting: After washing, the edible grass is drained of excess water by a vibrating drainer or a centrifugal dryer, and then cut into 3-5cm sections.
[0036] S4. Color protection treatment: Blanch the chopped leafy greens in boiling water for 15-30 seconds. After blanching, cool them quickly with cold water and drain.
[0037] S5. Drying: Segmented drying is adopted. The leafy grass is evenly spread on the drying tray or conveyor net. The initial stage is a high humidity stage with a drying temperature of 70-80℃ to quickly evaporate the surface moisture. The middle stage is a drying temperature of 60-65℃ for steady-state drying. The later stage is a drying temperature of 50-55℃ to avoid scorching and excessive damage to nutrients. Depending on the thickness of the spread, humidity and temperature, it usually takes 4-8 hours to dry the drained leafy grass until the moisture content drops to below 8%, and it is brittle and hard when squeezed by hand.
[0038] S6. Discharge Cooling: The dried leafy grass should be taken out of the drying equipment immediately and placed in a dry and clean environment for natural or forced cooling. It can only be crushed after cooling to room temperature. Otherwise, the residual heat will cause water vapor to condense, which will easily cause it to become damp and clump together, and affect the subsequent crushing effect.
[0039] S7. Crushing and Sieving: The cooled hay pieces are first coarsely crushed using a hammer mill, then finely ground using a vibratory mill, ultrafine mill, or air jet mill to obtain a fine powder. The ground powder is then sieved through an 80-120 mesh vibrating sieve. The material remaining on the sieve is returned to the crusher for re-crushing, and then sieved again through an 80-120 mesh vibrating sieve to ensure uniform powder fineness.
[0040] S8. Packaging and sterilization: Weighing, filling and sealing are performed using an automatic packaging machine, and the packaged products are irradiated with cobalt-60 or an electron beam.
[0041] S9. Finished Product Inspection and Warehousing: Sampling inspection of finished products shall be carried out. The main indicators of sampling inspection include: moisture content, microbial indicators, color, odor and fineness. After passing the inspection, the finished products shall be labeled and stored in the warehouse.
[0042] Choose a sunny morning to harvest leafy greens, and avoid harvesting on rainy days, as the moisture content of leafy greens is too high on rainy days.
[0043] Packaging uses food-grade aluminum foil bags, composite plastic bags, or tin cans.
[0044] Example 2
[0045] A processing flow and preparation method for dried leaf grass powder, wherein the color protection treatment further includes soaking in a 0.5%-1% sodium bicarbonate solution or color protection agent solution for 5-10 minutes.
[0046] The drying process employs vacuum freeze-drying to dry the drained leafy greens until the moisture content drops below 8%. Under low-temperature vacuum conditions, the moisture in the leafy greens directly sublimates from ice into water vapor, maximizing the preservation of the greens' color, aroma, flavor, shape, and heat-sensitive nutrients. The finished product has excellent rehydration properties.
[0047] Example 3
[0048] A processing flow and preparation method for dried leaf grass powder is disclosed. No color protection treatment is performed. The drying process uses solar energy to dry the drained leaf grass until the moisture content is reduced to below 8%. A solar drying greenhouse is constructed to sun-dry the drained leaf grass using sunlight. The process is low-cost, energy-saving and environmentally friendly.
[0049] The embodiments described above are preferred embodiments of the present invention, but not all embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
Claims
1. A processing flow for dried leafy green grass powder, characterized in that, Includes the following steps: S1. Raw material processing and selection: Select vigorous, disease-free tender leafy grasses for harvesting, remove yellow leaves, old leaves, diseased leaves, weeds and stems, and retain only high-quality leaves or some tender stems. S2. Cleaning and disinfection: The selected leafy greens are cleaned with a bubble cleaner or running water, and then soaked in food-grade low-concentration ozone water or sodium hypochlorite solution for a short time for disinfection. S3. Draining and cutting: After washing, the edible grass is drained of excess water by a vibrating drainer or a centrifugal dryer, and then cut into 3-5cm sections. S4. Color protection treatment: Blanch the chopped leafy grass in boiling water, then quickly cool it with cold water and drain it. S5. Drying: Use drying equipment to dry the drained leafy grass until the moisture content drops below 8%; S6. Discharge Cooling: The dried leafy grass should be removed from the drying equipment immediately and placed in a dry and clean environment for natural or forced cooling. S7. Crushing and sieving: The cooled hay pieces are first coarsely crushed using a hammer mill, and then finely ground using a vibratory mill, ultrafine mill or air jet mill to obtain fine powder. The ground powder is then sieved through an 80-120 mesh vibrating screen. S8. Packaging and sterilization: Weighing, filling and sealing are performed using an automatic packaging machine, and the packaged products are irradiated with cobalt-60 or an electron beam. S9. Finished Product Inspection and Warehousing: Sampling inspections are conducted on finished products. After passing the inspection, labels are affixed and the products are stored in the warehouse.
2. The processing flow of dried leafy grass powder according to claim 1, characterized in that: In step S1, the edible grass should be harvested on a sunny morning.
3. The processing flow of dried leafy grass powder according to claim 1, characterized in that: After soaking and disinfecting in step S2, the leafy greens should be thoroughly rinsed with clean water to remove any residual ozone water or sodium hypochlorite solution.
4. The processing flow of dried leafy grass powder according to claim 1, characterized in that: In step S4, the leafy greens are blanched in boiling water for 15-30 seconds.
5. The processing flow of dried leafy grass powder according to claim 1, characterized in that: The color protection treatment in step S4 also includes soaking in a 0.5%-1% sodium bicarbonate solution or color protection agent solution for 5-10 minutes.
6. The preparation method of the dried leaf grass powder according to claim 1, characterized in that: Step S5 includes hot air drying, vacuum freeze drying, and solar drying. Hot air drying is carried out in stages, with the temperature decreasing sequentially in the initial, middle, and later stages. Vacuum freeze drying uses a low-temperature vacuum environment to allow the moisture in the leafy grass to directly sublimate from ice into water vapor. Solar drying involves constructing a solar drying greenhouse to dry the drained leafy grass using sunlight.
7. The preparation method of the dried leaf grass powder according to claim 1, characterized in that: In step S7, the material on the vibrating screen is returned to the crusher for re-crushing and then sieved again through an 80-120 mesh vibrating screen.
8. The preparation method of the dried leaf grass powder according to claim 1, characterized in that: The main indicators for sampling inspection include: moisture content, microbial indicators, color, odor, and fineness.
9. The preparation method of the dried leaf grass powder according to claim 1, characterized in that: In step S8, food-grade aluminum foil bags, composite plastic bags, or tin cans are used for packaging.