Soluble organic trace element composition as well as preparation method and application thereof

Abstract

The invention discloses a soluble organic trace element composition as well as a preparation method and application thereof. The enteromorpha prolifera-montmorillonite nano composite material is specifically prepared from an enteromorpha prolifera extracting solution, a trehalose-montmorillonite nano composite material, boric acid, ammonium molybdate tetrahydrate, zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobaltous sulfate heptahydrate, manganese sulfate tetrahydrate, sodium selenite and the like. The composition can be used for preparing feed additives, raw material sources are green and environmentally friendly, the improvement of animal production performance can be obviously promoted, and the composition has very good market popularization prospects.

Description

Technical Field

[0001] The invention relates to a soluble organic trace element composition, a preparation method and application thereof, and belongs to the technical field of organic trace elements. Background Art

[0002] Soluble organic trace elements refer to organic trace element compounds that can dissolve in water. They have good water solubility to ensure that they can reach the absorption site in the intestine. Trace elements are chelated with amino acids, proteins, polysaccharides, etc. to form soluble organic trace elements, which improves the bioavailability and stability of trace elements and meets the nutritional needs of animals for trace elements.

[0003] In addition to water solubility, soluble organic trace elements should also have high stability to ensure that the molecular structure can remain stable throughout the entire digestive tract from the stomach to the intestines, and the biological effectiveness will not be reduced due to pH changes during the digestion process.

[0004] Compared with inorganic trace elements, soluble organic trace elements have obvious advantages. They only need less than half or even one-third of the dosage to meet the nutritional needs of farmed animals, have higher utilization rates, and obtain better economic benefits. Therefore, soluble organic trace elements are very important nutritional additives in modern animal husbandry and breeding industries.

[0005] Patent CN101544520B discloses a water-soluble solid organic complex micro-fertilizer, which is obtained by complexing copper, zinc, iron, manganese, molybdenum, etc. with ethylenediaminetetraacetic acid, citric acid, etc. The chelating agent ethylenediaminetetraacetic acid used in the patent technology is relatively expensive, which limits its promotion and application. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a soluble organic trace element composition, a preparation method and use thereof.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A soluble organic trace element composition is prepared from the following raw materials in parts by weight: 10 parts of enteromorpha extract, 1-2 parts of trehalose-montmorillonite nanocomposite material, 0.1-0.2 parts of boric acid, 0.1-0.2 parts of ammonium molybdate tetrahydrate, 0.3-0.4 parts of zinc sulfate heptahydrate, 0.3-0.4 parts of calcium nitrate tetrahydrate, 0.3-0.4 parts of ferrous sulfate heptahydrate, 0.3-0.4 parts of copper sulfate pentahydrate, 0.1-0.2 parts of cobalt sulfate heptahydrate, 0.1-0.2 parts of manganese sulfate tetrahydrate and 0.1-0.2 parts of sodium selenite.

[0008] Preferably, the Enteromorpha extract is prepared by the following method: first, the Enteromorpha is dried and crushed to less than 80 mesh to obtain Enteromorpha powder; then, the Enteromorpha powder is added to a 60-70% ethanol aqueous solution with a volume concentration of 20-25 times its weight, and ultrasonically oscillated at 300-400W for 40-50 minutes at 40-50°C, and the supernatant is taken by centrifugation, and the ethanol is removed by rotary evaporation to obtain the Enteromorpha extract.

[0009] Preferably, the trehalose-montmorillonite nanocomposite material is prepared by the following method: first, montmorillonite is added to distilled water, stirred at 300-500 r / min for 60-70 minutes, and allowed to stand for swelling for 24-30 hours to prepare a montmorillonite dispersion with a mass concentration of 1-2%; then, trehalose is added to an acetic acid solution with a volume concentration of 1-2%, stirred at 300-500 r / min for 5-6 hours to prepare a trehalose solution with a mass concentration of 1-2%; then, the trehalose solution is added dropwise to the montmorillonite dispersion, stirred at 65-75° C. for 30-40 hours, 1-2 mol / L sodium hydroxide solution is added dropwise until no precipitation is generated, the precipitate is collected, washed with water until neutral, dried, and crushed to less than 200 meshes to obtain the trehalose solution.

[0010] More preferably, the volume ratio of the trehalose solution to the montmorillonite dispersion is 3-4:1.

[0011] More preferably, the montmorillonite is sodium-montmorillonite with a particle size of 100 to 200 meshes.

[0012] The preparation method of the aforementioned soluble organic trace element composition, according to the formula, comprises the following specific steps: (1) First, add boric acid and ammonium molybdate tetrahydrate to the Enteromorpha extract to perform the first chelation reaction; (2) Then, trehalose-montmorillonite nanocomposite materials were added, and high-voltage pulse electric field pretreatment was performed, and then zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate were added for a second chelation reaction; (3) Finally, sodium selenite is added to carry out a third chelation reaction and spray-dried to obtain the product.

[0013] Preferably, in step (1), the process conditions for the first chelating reaction are: chelating reaction at 42-45° C. for 4-5 hours.

[0014] Preferably, in step (2), the process conditions of high-voltage pulse electric field pretreatment are: electric field intensity 8-10 kV / cm, pulse number 25-35 times, pulse width 100-200 μs, and treatment time 30-40 s.

[0015] Preferably, in step (2), the process conditions for the second chelating reaction are: chelating reaction at 40-42° C. for 4-5 hours.

[0016] Preferably, in step (3), the process conditions for the third chelation reaction are: chelation reaction at 40-42° C. for 1-2 hours under a magnetic field strength of 10-15 A / m.

[0017] The use of the above-mentioned soluble organic trace element composition in the preparation of feed additives.

[0018] Beneficial effects of the present invention: The present invention uses enteromorpha extract, trehalose-montmorillonite nanocomposite material, boric acid, ammonium molybdate tetrahydrate, zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate, sodium selenite and the like as raw materials to prepare a soluble organic trace element composition. The composition obtained by the present invention can be used for the preparation of feed additives, the raw material source is green and environmentally friendly, can significantly promote the improvement of animal production performance, and has very good market promotion prospects.

[0019] The extract of Enteromorpha contains small peptides, polysaccharides, oligosaccharides and other ingredients. These ingredients chelate with trace elements such as boron, molybdenum, zinc, calcium, iron, copper, cobalt, manganese and selenium, making the product highly water-soluble and more easily absorbed and utilized by animals, thereby promoting the improvement of animal production performance.

[0020] During the preparation, boric acid and ammonium molybdate tetrahydrate are first added to the enteromorpha extract for the first chelation reaction; then trehalose-montmorillonite nanocomposite material is added, high-voltage pulse electric field pretreatment is performed, and then zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate are added for the second chelation reaction; finally, sodium selenite is added for the third chelation reaction, and spray drying is performed to obtain the product. The trehalose-montmorillonite nanocomposite material has an interlayer structure, and these interlayer structures become microreactors for the chelation reaction, which can promote the chelation reaction and improve the chelation effect. The obtained product has a better promoting effect on animal production performance. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with embodiments. It should be noted that the following description is only for explaining the present invention and does not limit its contents. Embodiment 1:

[0022] A soluble organic trace element composition is prepared from the following raw materials: 10kg of enteromorpha extract, 1kg of trehalose-montmorillonite nanocomposite material, 0.1kg of boric acid, 0.1kg of ammonium molybdate tetrahydrate, 0.3kg of zinc sulfate heptahydrate, 0.3kg of calcium nitrate tetrahydrate, 0.3kg of ferrous sulfate heptahydrate, 0.3kg of copper sulfate pentahydrate, 0.1kg of cobalt sulfate heptahydrate, 0.1kg of manganese sulfate tetrahydrate and 0.1kg of sodium selenite.

[0023] The enteromorpha extract is prepared by the following method: first, the enteromorpha is dried and crushed to less than 80 meshes to obtain enteromorpha powder; then, the enteromorpha powder is added to a 60% ethanol aqueous solution with a volume concentration of 20 times its weight, and ultrasonically oscillated at 300W for 40 minutes at 40°C, the supernatant is centrifuged, and the ethanol is removed by rotary evaporation to obtain the enteromorpha extract.

[0024] The trehalose-montmorillonite nanocomposite material is prepared by the following method: firstly, sodium-based montmorillonite with a particle size of 100 mesh is added into distilled water, stirred at 300 r / min for 60 minutes, and allowed to stand for swelling for 24 hours to prepare a montmorillonite dispersion with a mass concentration of 1%; then, trehalose is added into an acetic acid solution with a volume concentration of 1%, stirred at 300 r / min for 5 hours to prepare a trehalose solution with a mass concentration of 1%; then, the trehalose solution is added drop by drop into the montmorillonite dispersion, stirred at 65° C. for 30 hours, 1 mol / L sodium hydroxide solution is added drop by drop until no precipitation is generated, and the precipitation is collected, washed with water until neutral, dried, and crushed to less than 200 meshes to obtain the trehalose solution.

[0025] The volume ratio of trehalose solution to montmorillonite dispersion is 3:1.

[0026] The preparation method of the aforementioned soluble organic trace element composition, according to the formula, comprises the following specific steps: (1) First, add boric acid and ammonium molybdate tetrahydrate to the Enteromorpha extract to perform the first chelation reaction; (2) Then, trehalose-montmorillonite nanocomposite materials were added, and high-voltage pulse electric field pretreatment was performed, and then zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate were added for a second chelation reaction; (3) Finally, sodium selenite is added to carry out a third chelation reaction and spray-dried to obtain the product.

[0027] In step (1), the process conditions for the first chelation reaction are: chelation reaction at 42° C. for 4 hours.

[0028] In step (2), the process conditions of high-voltage pulse electric field pretreatment are: electric field intensity 8 kV / cm, pulse number 25 times, pulse width 100 μs, and treatment time 30 s.

[0029] In step (2), the process conditions for the second chelating reaction are: chelating reaction at 40° C. for 4 hours.

[0030] In step (3), the process conditions for the third chelation reaction are: chelation reaction at 40° C. for 1 hour under a magnetic field strength of 10 A / m. Embodiment 2:

[0031] A soluble organic trace element composition is prepared from the following raw materials: 10 kg of enteromorpha extract, 2 kg of trehalose-montmorillonite nanocomposite material, 0.2 kg of boric acid, 0.2 kg of ammonium molybdate tetrahydrate, 0.4 kg of zinc sulfate heptahydrate, 0.4 kg of calcium nitrate tetrahydrate, 0.4 kg of ferrous sulfate heptahydrate, 0.4 kg of copper sulfate pentahydrate, 0.2 kg of cobalt sulfate heptahydrate, 0.2 kg of manganese sulfate tetrahydrate and 0.2 kg of sodium selenite.

[0032] The enteromorpha extract is prepared by the following method: first, the enteromorpha is dried and crushed to less than 80 meshes to obtain enteromorpha powder; then, the enteromorpha powder is added to a 70% ethanol aqueous solution with a volume concentration of 25 times its weight, and ultrasonically oscillated at 400W for 50 minutes at 50°C, the supernatant is centrifuged, and the ethanol is removed by rotary evaporation to obtain the enteromorpha extract.

[0033] The trehalose-montmorillonite nanocomposite material is prepared by the following method: firstly, sodium-based montmorillonite with a particle size of 200 mesh is added into distilled water, stirred at 500 r / min for 70 minutes, and allowed to stand for swelling for 30 hours to prepare a montmorillonite dispersion with a mass concentration of 2%; then, trehalose is added into an acetic acid solution with a volume concentration of 2%, stirred at 500 r / min for 6 hours to prepare a trehalose solution with a mass concentration of 2%; then, the trehalose solution is added drop by drop into the montmorillonite dispersion, stirred at 75° C. for 40 hours, a 2 mol / L sodium hydroxide solution is added drop by drop until no precipitation is generated, and the precipitation is collected, washed with water until neutral, dried, and crushed to less than 200 meshes to obtain the trehalose solution.

[0034] The volume ratio of trehalose solution to montmorillonite dispersion is 4:1.

[0035] The preparation method of the aforementioned soluble organic trace element composition, according to the formula, comprises the following specific steps: (1) First, add boric acid and ammonium molybdate tetrahydrate to the Enteromorpha extract to perform the first chelation reaction; (2) Then, trehalose-montmorillonite nanocomposite materials were added, and high-voltage pulse electric field pretreatment was performed, and then zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate were added for a second chelation reaction; (3) Finally, sodium selenite is added to carry out a third chelation reaction and spray-dried to obtain the product.

[0036] In step (1), the process conditions for the first chelating reaction are: chelating reaction at 45° C. for 5 hours.

[0037] In step (2), the process conditions of high-voltage pulse electric field pretreatment are: electric field intensity 10 kV / cm, pulse number 35 times, pulse width 200 μs, and treatment time 40 s.

[0038] In step (2), the process conditions for the second chelating reaction are: chelating reaction at 42° C. for 5 hours.

[0039] In step (3), the process conditions for the third chelation reaction are: chelation reaction at 42° C. for 2 hours under a magnetic field strength of 15 A / m. Embodiment 3:

[0040] A soluble organic trace element composition is prepared from the following raw materials: 10 kg of enteromorpha extract, 1 kg of trehalose-montmorillonite nanocomposite material, 0.2 kg of boric acid, 0.1 kg of ammonium molybdate tetrahydrate, 0.4 kg of zinc sulfate heptahydrate, 0.3 kg of calcium nitrate tetrahydrate, 0.4 kg of ferrous sulfate heptahydrate, 0.3 kg of copper sulfate pentahydrate, 0.2 kg of cobalt sulfate heptahydrate, 0.1 kg of manganese sulfate tetrahydrate and 0.2 kg of sodium selenite.

[0041] The enteromorpha extract is prepared by the following method: first, the enteromorpha is dried and crushed to less than 80 meshes to obtain enteromorpha powder; then, the enteromorpha powder is added to a 70% ethanol aqueous solution with a volume concentration of 20 times its weight, and ultrasonically oscillated at 400W for 40 minutes at 40°C, the supernatant is taken by centrifugation, and the ethanol is removed by rotary evaporation to obtain the enteromorpha extract.

[0042] The trehalose-montmorillonite nanocomposite material is prepared by the following method: firstly, sodium-based montmorillonite with a particle size of 200 mesh is added into distilled water, stirred at 300 r / min for 70 minutes, and allowed to stand for swelling for 24 hours to prepare a montmorillonite dispersion with a mass concentration of 2%; then, trehalose is added into an acetic acid solution with a volume concentration of 1%, stirred at 500 r / min for 5 hours to prepare a trehalose solution with a mass concentration of 2%; then, the trehalose solution is added drop by drop into the montmorillonite dispersion, stirred at 65° C. for 40 hours, 1 mol / L sodium hydroxide solution is added drop by drop until no precipitation is generated, and the precipitation is collected, washed with water until neutral, dried, and crushed to less than 200 mesh to obtain the trehalose solution.

[0043] The volume ratio of trehalose solution to montmorillonite dispersion is 4:1.

[0044] The preparation method of the aforementioned soluble organic trace element composition, according to the formula, comprises the following specific steps: (1) First, add boric acid and ammonium molybdate tetrahydrate to the Enteromorpha extract to perform the first chelation reaction; (2) Then, trehalose-montmorillonite nanocomposite materials were added, and high-voltage pulse electric field pretreatment was performed, and then zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate were added for a second chelation reaction; (3) Finally, sodium selenite is added to carry out a third chelation reaction and spray-dried to obtain the product.

[0045] In step (1), the process conditions for the first chelation reaction are: chelation reaction at 42° C. for 5 hours.

[0046] In step (2), the process conditions of high-voltage pulse electric field pretreatment are: electric field intensity 8 kV / cm, pulse number 35 times, pulse width 100 μs, and treatment time 40 s.

[0047] In step (2), the process conditions for the second chelating reaction are: chelating reaction at 40° C. for 5 hours.

[0048] In step (3), the process conditions for the third chelation reaction are: chelation reaction at 42° C. for 1 hour under a magnetic field strength of 10 A / m. Embodiment 4:

[0049] A soluble organic trace element composition is prepared from the following raw materials: 10 kg of enteromorpha extract, 1.5 kg of trehalose-montmorillonite nanocomposite material, 0.15 kg of boric acid, 0.15 kg of ammonium molybdate tetrahydrate, 0.35 kg of zinc sulfate heptahydrate, 0.35 kg of calcium nitrate tetrahydrate, 0.35 kg of ferrous sulfate heptahydrate, 0.35 kg of copper sulfate pentahydrate, 0.15 kg of cobalt sulfate heptahydrate, 0.15 kg of manganese sulfate tetrahydrate and 0.15 kg of sodium selenite.

[0050] The enteromorpha extract is prepared by the following method: first, the enteromorpha is dried and crushed to less than 80 meshes to obtain enteromorpha powder; then, the enteromorpha powder is added to a 65% ethanol aqueous solution with a volume concentration of 22 times its weight, and ultrasonically oscillated at 400W for 45 minutes at 45°C, the supernatant is centrifuged, and the ethanol is removed by rotary evaporation to obtain the enteromorpha extract.

[0051] The trehalose-montmorillonite nanocomposite material is prepared by the following method: firstly, sodium-based montmorillonite with a particle size of 200 mesh is added into distilled water, stirred at 400 r / min for 65 minutes, and allowed to stand for swelling for 28 hours to prepare a montmorillonite dispersion with a mass concentration of 1.5%; then, trehalose is added into an acetic acid solution with a volume concentration of 1.5%, stirred at 400 r / min for 5 hours, and a trehalose solution with a mass concentration of 1.5% is prepared; then, the trehalose solution is added drop by drop into the montmorillonite dispersion, stirred at 70° C. for 35 hours, a 1.5 mol / L sodium hydroxide solution is added drop by drop until no precipitation is generated, and the precipitation is collected, washed with water until neutral, dried, and crushed to less than 200 meshes to obtain the trehalose solution.

[0052] The volume ratio of trehalose solution to montmorillonite dispersion is 3.5:1.

[0053] The preparation method of the aforementioned soluble organic trace element composition, according to the formula, comprises the following specific steps: (1) First, add boric acid and ammonium molybdate tetrahydrate to the Enteromorpha extract to perform the first chelation reaction; (2) Then, trehalose-montmorillonite nanocomposite materials were added, and high-voltage pulse electric field pretreatment was performed, and then zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate were added for a second chelation reaction; (3) Finally, sodium selenite is added to carry out a third chelation reaction and spray-dried to obtain the product.

[0054] In step (1), the process conditions for the first chelating reaction are: chelating reaction at 43° C. for 5 hours.

[0055] In step (2), the process conditions of high-voltage pulse electric field pretreatment are: electric field intensity 9 kV / cm, pulse number 30 times, pulse width 200 μs, and treatment time 35 s.

[0056] In step (2), the process conditions for the second chelating reaction are: chelating reaction at 41° C. for 4.5 hours.

[0057] In step (3), the process conditions for the third chelation reaction are: chelation reaction at 41° C. for 1.5 hours under a magnetic field strength of 12 A / m. Comparative Example

[0058] A soluble organic trace element composition is prepared from the following raw materials: 10 kg of enteromorpha extract, 0.1 kg of boric acid, 0.1 kg of ammonium molybdate tetrahydrate, 0.3 kg of zinc sulfate heptahydrate, 0.3 kg of calcium nitrate tetrahydrate, 0.3 kg of ferrous sulfate heptahydrate, 0.3 kg of copper sulfate pentahydrate, 0.1 kg of cobalt sulfate heptahydrate, 0.1 kg of manganese sulfate tetrahydrate and 0.1 kg of sodium selenite.

[0059] The enteromorpha extract is prepared by the following method: first, the enteromorpha is dried and crushed to less than 80 meshes to obtain enteromorpha powder; then, the enteromorpha powder is added to a 60% ethanol aqueous solution with a volume concentration of 20 times its weight, and ultrasonically oscillated at 300W for 40 minutes at 40°C, the supernatant is centrifuged, and the ethanol is removed by rotary evaporation to obtain the enteromorpha extract.

[0060] The volume ratio of trehalose solution to montmorillonite dispersion is 3:1.

[0061] The preparation method of the aforementioned soluble organic trace element composition, according to the formula, comprises the following specific steps: (1) First, add boric acid and ammonium molybdate tetrahydrate to the Enteromorpha extract to perform the first chelation reaction; (2) Pretreatment with a high-voltage pulse electric field, followed by the addition of zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate for a second chelation reaction; (3) Finally, sodium selenite is added to carry out a third chelation reaction and spray-dried to obtain the product.

[0062] In step (1), the process conditions for the first chelation reaction are: chelation reaction at 42° C. for 4 hours.

[0063] In step (2), the process conditions of high-voltage pulse electric field pretreatment are: electric field intensity 8 kV / cm, pulse number 25 times, pulse width 100 μs, and treatment time 30 s.

[0064] In step (2), the process conditions for the second chelating reaction are: chelating reaction at 40° C. for 4 hours.

[0065] In step (3), the process conditions for the third chelation reaction are: chelation reaction at 40° C. for 1 hour under a magnetic field strength of 10 A / m. Experimental example

[0066] The compositions obtained in Examples 1 to 4 and the comparative example were used to carry out animal feeding experiments, and the specific methods are as follows: 500 laying hens aged 260 days were randomly divided into 5 groups and caged. The compositions obtained in Examples 1 to 4 and the comparative example were used as feed additives and matched with the basic feed for laying hens, specifically the basic feed + composition 200 mg / kg, and the basic feed composition was: 55.7 kg corn, 8.0 kg second flour, 11.5 kg soybean meal, 8.0 kg peanut kernel cake, 4.0 kg fish meal, 1.2 kg calcium hydrogen phosphate, 7.7 kg stone powder, 0.10 kg methionine, 3.0 kg vegetable oil, 0.50 kg additives, and 0.30 kg sodium chloride. Free feeding, free drinking water, pre-feeding for 1 week, formal feeding for 8 weeks, statistical calculation of egg production rate and average egg weight, the results are shown in Table 1.

[0067] Table 1. Results of the laying hen feeding experiment Egg production rate (%) Average egg weight (g) Example 1 95.4 72.3 Example 2 95.5 72.3 Example 3 95.7 72.8 Example 4 96.0 73.2 Comparative Example 91.4 68.9 As shown in Table 1, the compositions obtained in Examples 1 to 4 can significantly increase the egg production rate of laying hens, and the average egg weight is high, indicating that the production performance of laying hens can be improved.

[0068] In the comparative example, when the trehalose-montmorillonite nanocomposite material was omitted, the production performance of laying hens was significantly deteriorated, indicating that the presence of the trehalose-montmorillonite nanocomposite material can promote the chelation of trace elements, which is better absorbed by laying hens and promotes the improvement of the production performance of laying hens.

[0069] Although the above describes the specific implementation methods of the present invention, it does not limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A soluble organic trace element composition, characterized in that: The invention is prepared from the following raw materials in parts by weight: 10 parts of enteromorpha extract, 1-2 parts of trehalose-montmorillonite nanocomposite material, 0.1-0.2 parts of boric acid, 0.1-0.2 parts of ammonium molybdate tetrahydrate, 0.3-0.4 parts of zinc sulfate heptahydrate, 0.3-0.4 parts of calcium nitrate tetrahydrate, 0.3-0.4 parts of ferrous sulfate heptahydrate, 0.3-0.4 parts of copper sulfate pentahydrate, 0.1-0.2 parts of cobalt sulfate heptahydrate, 0.1-0.2 parts of manganese sulfate tetrahydrate and 0.1-0.2 parts of sodium selenite.

2. A soluble organic trace element composition according to claim 1, characterized in that: The enteromorpha extract is prepared by the following method: firstly, the enteromorpha is dried and crushed to less than 80 meshes to obtain enteromorpha powder; then, the enteromorpha powder is added to a 60-70% ethanol aqueous solution with a volume concentration of 20-25 times the weight of the enteromorpha powder, and ultrasonic oscillation is performed at 300-400W for 40-50 minutes at 40-50°C, and the supernatant is obtained by centrifugation, and the ethanol is removed by rotary evaporation to obtain the enteromorpha extract.

3. A soluble organic trace element composition according to claim 1, characterized in that: The trehalose-montmorillonite nanocomposite material is prepared by the following method: firstly, montmorillonite is added into distilled water, stirred at 300-500 r / min for 60-70 minutes, and allowed to stand for swelling for 24-30 hours to prepare a montmorillonite dispersion with a mass concentration of 1-2%; then, trehalose is added into an acetic acid solution with a volume concentration of 1-2%, stirred at 300-500 r / min for 5-6 hours to prepare a trehalose solution with a mass concentration of 1-2%; then, the trehalose solution is added drop by drop into the montmorillonite dispersion, stirred at 65-75° C. for 30-40 hours, 1-2 mol / L sodium hydroxide solution is added drop by drop until no more precipitation is generated, and the precipitation is collected, washed with water until neutral, dried, and crushed to less than 200 meshes to obtain the trehalose solution.

4. A soluble organic trace element composition according to claim 3, characterized in that: The volume ratio of trehalose solution to montmorillonite dispersion is 3-4:

1.

5. A method for preparing a soluble organic trace element composition according to any one of claims 1 to 4, characterized in that: According to the formula, the specific steps are as follows: (1) First, boric acid and ammonium molybdate tetrahydrate are added to the Enteromorpha extract to perform the first chelation reaction; (2) Then, trehalose-montmorillonite nanocomposite materials were added, and high-voltage pulse electric field pretreatment was performed, and then zinc sulfate heptahydrate, calcium nitrate tetrahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate, and manganese sulfate tetrahydrate were added for a second chelation reaction; (3) Finally, sodium selenite is added to carry out a third chelation reaction and spray-dried to obtain the product.

6. The preparation method according to claim 5, characterized in that: In step (1), the process conditions for the first chelating reaction are: chelating reaction at 42-45° C. for 4-5 hours.

7. The preparation method according to claim 5, characterized in that: In step (2), the process conditions of high-voltage pulse electric field pretreatment are: electric field intensity 8-10 kV / cm, pulse number 25-35 times, pulse width 100-200 μs, and treatment time 30-40 s.

8. The preparation method according to claim 5, characterized in that: In step (2), the process conditions for the second chelating reaction are: chelating reaction at 40-42° C. for 4-5 hours.

9. The preparation method according to claim 5, characterized in that: In step (3), the process conditions for the third chelation reaction are: chelation reaction at 40-42° C. for 1-2 hours under a magnetic field strength of 10-15 A / m.

10. Use of the soluble organic trace element composition according to any one of claims 1 to 4 in the preparation of feed additives.