CN114304260A - Natural preservative for citrus emperor and preparation method thereof - Google Patents
Natural preservative for citrus emperor and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims description 32
- 241000207199 Citrus Species 0.000 title description 6
- 235000020971 citrus fruits Nutrition 0.000 title description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 97
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Abstract
The invention discloses a natural citrus reticulata blanco preservative which comprises the following raw materials in parts by weight; 20-30 parts of plant compound agent, 1-6 parts of 2,4-D sodium salt powder, 1-5 parts of sorbitan monostearate, 1-2 parts of chitosan solvent and 1-2 parts of potassium sorbate. The plant compound agent prepared by matching lotus leaves and bamboo leaves has efficient anticorrosion and fresh-keeping functions, the extracting solution extracted from the lotus leaves and the bamboo leaves can be conveniently permeated into the diatomite slow-release agent by introducing the diatomite corrosion inhibitor, the diatomite corrosion inhibitor is matched with wollastonite and clay, the clay and the diatomite are in cross fit to form a stable three-dimensional system, and the extracting solution is dissolved in the three-dimensional system, so that the stable and long-term antibacterial, anticorrosion and fresh-keeping effects can be kept; the wollastonite has a needle-shaped structure, so that the wollastonite has carrying capacity, and is matched with an extracting solution to penetrate into a pathogen body, thereby having better antibacterial and bactericidal capacity.
Description
Technical Field
The invention relates to the technical field of preservatives, and particularly relates to a natural preservative for emperor oranges and a preparation method thereof.
Background
The emperor citrus, also known as tribute citrus, originally originated from Zhen mountain in Sihui city, Guangdong province, and is a kind of agricultural excellent and rare varieties. The planting history is long, the citrus gonggan is planted in the Tang generation, the Sihui and the Deqing. The product has been listed as tribute for emperor in court due to its excellent quality during northern Song. Has the advantages of both orange and tangerine, is awarded by China association for fruit circulation to reputations of "China famous fruit", "GG China citrus soil" and the like, and has important economic value. The pure tribute orange has beautiful fruit shape, golden fruit color, thin peel and few kernels, crisp meat, slag melting, fresh and sweet aroma, high sugar content, low acidity and strong flavor, and integrates the advantages of beautiful appearance of oranges and tender orange meat and easy peeling;
the existing preservative rarely adopts a plant extractant for preservation treatment, even if the preservative is adopted, the proportion is simple, the plant extractant exerting efficiency is poor, and the higher-level preservation effect is difficult to achieve.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a natural citrus reticulata antistaling agent and a preparation method thereof, so as to solve the problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a natural citrus reticulata blanco preservative which comprises the following raw materials in parts by weight;
20-30 parts of plant compound agent, 1-6 parts of 2,4-D sodium salt powder, 1-5 parts of sorbitan monostearate, 1-2 parts of chitosan solvent and 1-2 parts of potassium sorbate.
Preferably, the natural citrus reticulata preservative comprises the following raw materials in parts by weight:
25 parts of plant compound agent, 3.5 parts of 2,4-D sodium salt powder, 3 parts of sorbitan monostearate, 1.5 parts of chitosan solvent and 1.5 parts of potassium sorbate.
Preferably, the preparation method of the plant compound agent comprises the following steps:
s1: mixing the lotus leaves and the bamboo leaves according to the weight ratio of 3:1, then washing with water, sending into a crusher for crushing, sieving with 300 meshes, then carrying out microwave irradiation for 1-2min, wherein the irradiation power is 300-500W;
s2: adding acetone aqueous solution according to the feed-liquid ratio of 1:100, refluxing for 1-3h at 80-90 ℃, and collecting the extractant after the reflux is finished;
s3: mixing and stirring the extracting agent of S2 and the diatomite slow-release agent according to the weight ratio of 3:2, wherein the stirring speed is 100-500r/min, the stirring time is 30-40min, the stirring temperature is 35-45 ℃, the stirring is finished, standing is carried out for 10-20min under 1-5MPa, and the plant compound agent is obtained after the standing is finished.
The invention also provides a preparation method of the natural citrus reticulata preservative, which comprises the following steps:
sequentially adding the plant compound agent, the 2,4-D sodium salt powder, the sorbitan monostearate, the chitosan solvent and the potassium sorbate into a mixer for mixing at the mixing speed of 100-700r/min for 20-30min, then continuing to stir at the speed of 100-300r/min for 10-20min, and finally obtaining the natural citrus reticulata preservative after stirring.
Bamboo leaves contain a large amount of flavonoid compounds, various bioactive polysaccharides and other effective components with various benefits such as: terpene lactones, anthraquinones, phenolic acid compounds, zinc, manganese, selenium and the like.
The plant compound agent prepared by matching lotus leaves and bamboo leaves has efficient anticorrosion and fresh-keeping functions, the extract extracted from the lotus leaves and the bamboo leaves can be conveniently permeated into the diatomite slow-release agent by introducing the diatomite corrosion inhibitor, the corrosion inhibitor adopts the mixture ratio of the diatomite, the wollastonite and the clay, the clay and the diatomite are in cross fit to form a stable three-dimensional system, and the extract is dissolved in the three-dimensional system, so that the stable and long-term antibacterial, anticorrosion and fresh-keeping effects can be kept; the wollastonite has a needle-shaped structure, so that the wollastonite has carrying capacity, and is matched with an extracting solution to penetrate into a pathogen body, thereby having better antibacterial and bactericidal capacity.
Preferably, the preparation method of the diatomite slow-release agent comprises the following steps:
s1: mixing diatomite and sodium citrate according to a weight ratio of 1:3, then adding water which is 2-3 times of the total weight of the diatomite, subsequently raising the reaction temperature to 75-85 ℃, then adding hydrochloric acid, and adjusting the pH value to 6.0-7.0 to obtain a diatomite dispersion;
s2: mixing the diatomite dispersion, the carrying agent and the clay according to a weight ratio of 5:2:1, then reacting at the temperature of 150-170 ℃ for 30-40min, and cooling to the natural room temperature after the reaction is finished;
s3: and then placing the mixture in a hot pressing furnace for molding treatment, and obtaining the diatomite slow release agent after the treatment is finished.
Preferably, the pressure of the forming treatment is 1-10MPa, and the treatment time is 10-20 min.
Preferably, the carrying agent is wollastonite, and the wollastonite is subjected to heat activation treatment at the temperature of 100-300 ℃ for 20-30min, so that the carrying agent of the wollastonite is obtained after the treatment is finished.
Preferably, the preparation method of the chitosan penetration agent comprises the following steps:
s1: adding glacial acetic acid into chitosan, and dissolving;
s2: then adding sodium alginate solution with 10-20% of the total amount of chitosan, stirring at low speed of 300r/min for 10-20min, and finishing stirring;
s3: then the temperature is raised to 70-80 ℃, and the chitosan solvent is stirred for 20-30min at the rotating speed of 500-700r/min to obtain the chitosan solvent.
Preferably, the mass fraction of the sodium alginate solution is 10-20%.
Preferably, the mass fraction of the sodium alginate solution is 15%.
The product has the advantages of convenient cleaning of raw materials, convenient and efficient cleaning by adopting clear water, and capability of improving the green and environment-friendly performance and safe edible performance of the product.
Compared with the prior art, the invention has the following beneficial effects:
the alkaloid in the lotus leaves has stronger inhibitory activity to wine yeast, escherichia coli, bacillus subtilis, staphylococcus aureus and the like, and the lotus leaf volatile oil has better inhibitory action to bacteria, yeast and mould;
bamboo leaves contain a large amount of flavonoid compounds, various bioactive polysaccharides and other effective components with various benefits such as: terpene lactones, anthraquinones, phenolic acid compounds, zinc, manganese, selenium, and the like; in addition, the flavonoid compounds in the bamboo leaves are mainly flavonoid glycosides, and take glycosides as main components, wherein isovitexin, vitexin, isoorientin and orientin are 4 main flavonoid glycosides, and the combination of the lotus leaves and the bamboo leaves can improve the preservative and fresh-keeping effects of the product;
1. the plant compound agent, the 2,4-D sodium salt powder, the sorbitan monostearate, the chitosan penetrating agent and the potassium sorbate are mixed according to a proportion, so that the plant compound agent, the 2,4-D sodium salt powder, the sorbitan monostearate, the chitosan penetrating agent and the potassium sorbate are mixed according to a simple proportion, the mixing effect is good, the green and environment-friendly preservative effect is achieved, the plant compound agent and the chitosan penetrating agent are improved, the coordination capability among the raw materials is enhanced, and the preservation effect of the product is improved.
2. The plant compound agent prepared by matching lotus leaves and bamboo leaves has efficient anticorrosion and fresh-keeping functions, the extract extracted from the lotus leaves and the bamboo leaves can be conveniently permeated into the diatomite slow-release agent by introducing the diatomite corrosion inhibitor, the corrosion inhibitor adopts the mixture ratio of the diatomite, the wollastonite and the clay, the clay and the diatomite are in cross fit to form a stable three-dimensional system, and the extract is dissolved in the three-dimensional system, so that the stable and long-term antibacterial, anticorrosion and fresh-keeping effects can be kept; the wollastonite has a needle-shaped structure, so that the wollastonite has carrying capacity, and is matched with an extracting solution to penetrate into a pathogen body, thereby having better antibacterial and bactericidal capacity.
3. The preparation of the chitosan dissolving agent comprises the steps of reacting chitosan with glacial acetic acid, dissolving chitosan, stirring and dispersing with a sodium alginate solution, so that the chitosan is better dispersed, and meanwhile, the chitosan and the glacial acetic acid are compounded, so that raw materials of the product can be better dissolved to the surface of the emperor orange, and the diatomite slow-release agent of a three-dimensional system is coated on the surface of the emperor orange to form a better coating effect; and the needle-shaped structure of the wollastonite penetrates through the outer layer of the emperor orange and acts with germs to play an excellent fresh-keeping effect.
4. The product has the advantages of convenient cleaning of raw materials, convenient and efficient cleaning by adopting clear water, and capability of improving the green and environment-friendly performance and safe edible performance of the product.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The natural citrus reticulata blanco preservative comprises the following raw materials in parts by weight;
20-30 parts of plant compound agent, 1-6 parts of 2,4-D sodium salt powder, 1-5 parts of sorbitan monostearate, 1-2 parts of chitosan solvent and 1-2 parts of potassium sorbate.
The natural citrus reticulata blanco preservative comprises the following raw materials in parts by weight:
25 parts of plant compound agent, 3.5 parts of 2,4-D sodium salt powder, 3 parts of sorbitan monostearate, 1.5 parts of chitosan solvent and 1.5 parts of potassium sorbate.
The preparation method of the plant compound agent of the embodiment comprises the following steps:
s1: mixing the lotus leaves and the bamboo leaves according to the weight ratio of 3:1, then washing with water, sending into a crusher for crushing, sieving with 300 meshes, then carrying out microwave irradiation for 1-2min, wherein the irradiation power is 300-500W;
s2: adding acetone aqueous solution according to the feed-liquid ratio of 1:100, refluxing for 1-3h at 80-90 ℃, and collecting the extractant after the reflux is finished;
s3: mixing and stirring the extracting agent of S2 and the diatomite slow-release agent according to the weight ratio of 3:2, wherein the stirring speed is 100-500r/min, the stirring time is 30-40min, the stirring temperature is 35-45 ℃, the stirring is finished, standing is carried out for 10-20min under 1-5MPa, and the plant compound agent is obtained after the standing is finished.
The preparation method of the diatomite slow-release agent comprises the following steps:
s1: mixing diatomite and sodium citrate according to a weight ratio of 1:3, then adding water which is 2-3 times of the total weight of the diatomite, subsequently raising the reaction temperature to 75-85 ℃, then adding hydrochloric acid, and adjusting the pH value to 6.0-7.0 to obtain a diatomite dispersion;
s2: mixing the diatomite dispersion, the carrying agent and the clay according to a weight ratio of 5:2:1, then reacting at the temperature of 150-170 ℃ for 30-40min, and cooling to the natural room temperature after the reaction is finished;
s3: and then placing the mixture in a hot pressing furnace for molding treatment, and obtaining the diatomite slow release agent after the treatment is finished.
The pressure of the molding treatment in this example is 1-10MPa, and the treatment time is 10-20 min.
The entrainer in this embodiment is wollastonite, and the wollastonite is subjected to heat activation treatment at 100-300 ℃ for 20-30min, and the entrainer of the wollastonite is obtained after the treatment is finished.
The preparation method of the chitosan penetration enhancer of the embodiment comprises the following steps:
s1: adding glacial acetic acid into chitosan, and dissolving;
s2: then adding sodium alginate solution with 10-20% of the total amount of chitosan, stirring at low speed of 300r/min for 10-20min, and finishing stirring;
s3: then the temperature is raised to 70-80 ℃, and the chitosan solvent is stirred for 20-30min at the rotating speed of 500-700r/min to obtain the chitosan solvent.
The mass fraction of the sodium alginate solution in the embodiment is 10-20%.
The mass fraction of the sodium alginate solution in this example was 15%.
The preparation method of the natural citrus reticulata preservative provided by the embodiment comprises the following steps:
sequentially adding the plant compound agent, the 2,4-D sodium salt powder, the sorbitan monostearate, the chitosan solvent and the potassium sorbate into a mixer for mixing at the mixing speed of 100-700r/min for 20-30min, then continuing to stir at the speed of 100-300r/min for 10-20min, and finally obtaining the natural citrus reticulata preservative after stirring.
Example 1.
The natural citrus reticulata blanco preservative comprises the following raw materials in parts by weight;
20 parts of plant compound agent, 1 part of 2,4-D sodium salt powder, 1 part of sorbitan monostearate, 1 part of chitosan solvent and 1 part of potassium sorbate.
The preparation method of the plant compound agent of the embodiment comprises the following steps:
s1: mixing lotus leaves and bamboo leaves according to the weight ratio of 3:1, then washing with water, feeding into a grinder for grinding, sieving with a 100-mesh sieve, and then carrying out microwave irradiation for 1min with the irradiation power of 300W;
s2: adding an acetone aqueous solution according to the feed-liquid ratio of 1:100, refluxing for 1h at 80 ℃, and collecting an extracting agent after the refluxing is finished;
s3: mixing the extractant of S2 with the diatomite slow-release agent according to the weight ratio of 3:2, stirring at the rotation speed of 100r/min for 30min at the stirring temperature of 35 ℃, standing at 1MPa for 10min after stirring, and standing to obtain the plant compound agent.
The preparation method of the diatomite slow-release agent comprises the following steps:
s1: mixing diatomite and sodium citrate according to a weight ratio of 1:3, then adding water 2 times of the total weight of the diatomite, then raising the reaction temperature to 75 ℃, then adding hydrochloric acid, and adjusting the pH value to 6.0 to obtain a diatomite dispersion;
s2: mixing the diatomite dispersion, the carrying agent and the clay according to the weight ratio of 5:2:1, then reacting for 30min at 150 ℃, and cooling to the natural room temperature after the reaction is finished;
s3: and then placing the mixture in a hot pressing furnace for molding treatment, and obtaining the diatomite slow release agent after the treatment is finished.
The pressure of the molding treatment in this example was 1MPa, and the treatment time was 10 min.
The carrying agent of the embodiment is wollastonite, and the wollastonite is subjected to thermal activation treatment at 100 ℃ for 20min to obtain the carrying agent of the wollastonite.
The preparation method of the chitosan penetration enhancer of the embodiment comprises the following steps:
s1: adding glacial acetic acid into chitosan, and dissolving;
s2: then adding sodium alginate solution with 10% of chitosan total amount, stirring at low speed of 100r/min for 10-min, and stirring;
s3: then heating to 70 ℃, and continuing stirring at the rotating speed of 500r/min for 20min to obtain the chitosan solvent.
The mass fraction of the sodium alginate solution in this example was 10%.
The preparation method of the natural citrus reticulata preservative provided by the embodiment comprises the following steps:
sequentially adding the plant compound agent, the 2,4-D sodium salt powder, the sorbitan monostearate, the chitosan solvent and the potassium sorbate into a mixer for mixing at the mixing speed of 100r/min for 20min, then continuing to stir at the speed of 100r/min for 10min, and finally obtaining the natural citrus reticulata preservative.
Example 2.
The natural citrus reticulata blanco preservative comprises the following raw materials in parts by weight;
30 parts of plant compound agent, 6 parts of 2,4-D sodium salt powder, 5 parts of sorbitan monostearate, 2 parts of chitosan solvent and 2 parts of potassium sorbate.
The natural citrus reticulata blanco preservative comprises the following raw materials in parts by weight:
the preparation method of the plant compound agent of the embodiment comprises the following steps:
s1: mixing lotus leaves and bamboo leaves according to the weight ratio of 3:1, then washing with water, feeding into a grinder for grinding, sieving with a 300-mesh sieve, and then carrying out microwave irradiation for 2min, wherein the irradiation power is 500W;
s2: adding an acetone aqueous solution according to the feed-liquid ratio of 1:100, refluxing for 3h at 90 ℃, and collecting an extracting agent after the refluxing is finished;
s3: mixing the extractant of S2 with the diatomite slow-release agent according to the weight ratio of 3:2, stirring at 500r/min for 40min at 45 deg.C, standing at 5MPa for 20min, and standing to obtain the plant compound agent.
The preparation method of the diatomite slow-release agent comprises the following steps:
s1: mixing diatomite and sodium citrate according to a weight ratio of 1:3, then adding water which is 3 times of the total weight of the diatomite, then raising the reaction temperature to 85 ℃, then adding hydrochloric acid, and adjusting the pH value to 7.0 to obtain a diatomite dispersion;
s2: mixing the diatomite dispersion, the carrying agent and the clay according to the weight ratio of 5:2:1, then reacting for 40min at 170 ℃, and cooling to the natural room temperature after the reaction is finished;
s3: and then placing the mixture in a hot pressing furnace for molding treatment, and obtaining the diatomite slow release agent after the treatment is finished.
The pressure of the molding treatment in this example was 10MPa, and the treatment time was 20 min.
The carrying agent of the embodiment is wollastonite, and the wollastonite is subjected to thermal activation treatment at 300 ℃ for 30min to obtain the carrying agent of the wollastonite.
The preparation method of the chitosan penetration enhancer of the embodiment comprises the following steps:
s1: adding glacial acetic acid into chitosan, and dissolving;
s2: then adding sodium alginate solution with the total amount of chitosan being 20% to stir at low speed for 20min, wherein the stirring speed is 300r/min, and the stirring is finished;
s3: then the temperature is increased to 80 ℃, and the chitosan solvent is stirred for 30min at the rotating speed of 700r/min to obtain the chitosan solvent.
The mass fraction of the sodium alginate solution in this example was 20%.
The preparation method of the natural citrus reticulata preservative provided by the embodiment comprises the following steps:
sequentially adding the plant compound agent, 2,4-D sodium salt powder, sorbitan monostearate, chitosan solvent and potassium sorbate into a mixer for mixing at the mixing speed of 700r/min for 30min, then continuing to stir at the speed of 300r/min for 20min, and finally stirring to obtain the natural citrus reticulata preservative.
Example 3.
The natural citrus reticulata blanco preservative comprises the following raw materials in parts by weight;
25 parts of plant compound agent, 3.5 parts of 2,4-D sodium salt powder, 3 parts of sorbitan monostearate, 1.5 parts of chitosan solvent and 1.5 parts of potassium sorbate.
The preparation method of the plant compound agent of the embodiment comprises the following steps:
s1: mixing lotus leaves and bamboo leaves according to the weight ratio of 3:1, then washing with water, feeding into a grinder for grinding, sieving with a 200-mesh sieve, and then carrying out microwave irradiation for 1.5min with the irradiation power of 400W;
s2: adding an acetone aqueous solution according to the material-liquid ratio of 1:100, refluxing for 2h at 85 ℃, and collecting an extracting agent after the refluxing is finished;
s3: mixing and stirring the extracting agent of S2 and the diatomite slow-release agent according to the weight ratio of 3:2, wherein the stirring speed is 100-500r/min, the stirring time is 30-40min, the stirring temperature is 35-45 ℃, the stirring is finished, standing is carried out for 10-20min under 1-5MPa, and the plant compound agent is obtained after the standing is finished.
The preparation method of the diatomite slow-release agent comprises the following steps:
s1: mixing diatomite and sodium citrate according to a weight ratio of 1:3, then adding water which is 2.5 times of the total weight of the diatomite, subsequently raising the reaction temperature to 80 ℃, then adding hydrochloric acid, and adjusting the pH value to 6.5 to obtain a diatomite dispersion;
s2: mixing the diatomite dispersion, the carrying agent and the clay according to the weight ratio of 5:2:1, then reacting for 35min at 160 ℃, and cooling to the natural room temperature after the reaction is finished;
s3: and then placing the mixture in a hot pressing furnace for molding treatment, and obtaining the diatomite slow release agent after the treatment is finished.
The pressure of the molding treatment in this example was 5.5MPa, and the treatment time was 15 min.
The carrying agent of the embodiment is wollastonite, and the wollastonite is subjected to thermal activation treatment at 200 ℃ for 25min to obtain the carrying agent of the wollastonite.
The preparation method of the chitosan penetration enhancer of the embodiment comprises the following steps:
s1: adding glacial acetic acid into chitosan, and dissolving;
s2: then adding sodium alginate solution accounting for 15 percent of the total amount of the chitosan, stirring at a low speed of 200r/min for 15min, and finishing stirring;
s3: then heating to 75 ℃, and continuing stirring at the rotating speed of 600r/min for 25min to obtain the chitosan solvent.
The mass fraction of the sodium alginate solution in this example was 15%.
The preparation method of the natural citrus reticulata preservative provided by the embodiment comprises the following steps:
sequentially adding the plant compound agent, 2,4-D sodium salt powder, sorbitan monostearate, chitosan solvent and potassium sorbate into a mixer for mixing at the mixing speed of 400r/min for 25min, then continuing to stir at the speed of 200r/min for 15min, and finally stirring to obtain the natural citrus reticulata preservative.
Comparative example 1.
Unlike example 3, no diatomaceous earth slow-release agent was added.
Comparative example 2.
Unlike example 3, no chitosan permeabilizing agent was added.
The products of examples 1-3 and comparative examples 1-2 were subjected to fresh-keeping treatment with a fresh-keeping agent for 4-5 months, and the control group was not subjected to fresh-keeping treatment, and the performance was tested as follows;
weight loss rate (weight of original emperor orange-weight after preservation)/weight of original emperor orange
The results of the performance measurements of examples 1 to 3 and comparative examples 1 to 2 and the control group are as follows
The products of the examples 1 to 3, the comparative examples 1 to 2 and the control group have excellent preservation performance and lowest weight loss rate, the preservation effect of the products can be effectively improved by adding the diatomite slow-release agent and the chitosan solvent, and the weight loss rate change rate of the products of the examples 1 to 3 is relatively moderate after the products are stored for 30 to 120 days.
The appearance of the product was tested:
the products of examples 1 to 3 and comparative examples 1 to 2 and the control were further subjected to performance tests, the results of which are shown below
The experiment in the table shows that the product of the invention has excellent fresh-keeping performance, no appearance change, full and glossy fruits, no mildew or rot.
The invention further explores the performance of the diatomite slow-release agent;
the preparation method of the diatomite slow release agent comprises the following steps:
s1: mixing diatomite and sodium citrate according to a weight ratio of 1:3, then adding water which is 2.5 times of the total weight of the diatomite, subsequently raising the reaction temperature to 80 ℃, then adding hydrochloric acid, and adjusting the pH value to 6.5 to obtain a diatomite dispersion;
s2: mixing the diatomite dispersion, the carrying agent and the clay according to the weight ratio of 5:2:1, then reacting for 35min at 160 ℃, and cooling to the natural room temperature after the reaction is finished;
s3: and then placing the mixture in a hot pressing furnace for molding treatment, and obtaining the diatomite slow release agent after the treatment is finished.
Experimental example 1:
the same as in example 3, except that no clay was added to the preparation of the diatomaceous earth slow-release agent.
Experimental example 2:
the same as in example 3, except that no carrier was added to the preparation of the diatomaceous earth slow-release formulation.
Experimental example 3:
the same as in example 3, except that no diatomaceous earth dispersion treatment was used in the preparation of the diatomaceous earth dispersion.
As can be seen from the experimental examples 1-3, in the preparation of the diatomite slow-release agent, the clay, the carrying agent and the diatomite are dispersed and matched to achieve a good fresh-keeping effect on the product, and the clay, the carrying agent and the diatomite have synergistic effects.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A natural preservative for emperor oranges is characterized by comprising the following raw materials in parts by weight;
20-30 parts of plant compound agent, 1-6 parts of 2,4-D sodium salt powder, 1-5 parts of sorbitan monostearate, 1-2 parts of chitosan solvent and 1-2 parts of potassium sorbate.
2. The natural citrus reticulata blanco preservative according to claim 1, wherein the natural citrus reticulata blanco preservative comprises the following raw materials in parts by weight:
25 parts of plant compound agent, 3.5 parts of 2,4-D sodium salt powder, 3 parts of sorbitan monostearate, 1.5 parts of chitosan solvent and 1.5 parts of potassium sorbate.
3. The natural citrus reticulata blanco preservative according to claim 1, wherein the preparation method of the plant compound agent comprises the following steps:
s1: mixing the lotus leaves and the bamboo leaves according to the weight ratio of 3:1, then washing with water, sending into a crusher for crushing, sieving with 300 meshes, then carrying out microwave irradiation for 1-2min, wherein the irradiation power is 300-500W;
s2: adding acetone aqueous solution according to the feed-liquid ratio of 1:100, refluxing for 1-3h at 80-90 ℃, and collecting the extractant after the reflux is finished;
s3: mixing and stirring the extracting agent of S2 and the diatomite slow-release agent according to the weight ratio of 3:2, wherein the stirring speed is 100-500r/min, the stirring time is 30-40min, the stirring temperature is 35-45 ℃, the stirring is finished, standing is carried out for 10-20min under 1-5MPa, and the plant compound agent is obtained after the standing is finished.
4. The natural citrus reticulata blanco preservative according to claim 3, wherein the preparation method of the diatomite slow-release agent comprises the following steps:
s1: mixing diatomite and sodium citrate according to a weight ratio of 1:3, then adding water which is 2-3 times of the total weight of the diatomite, subsequently raising the reaction temperature to 75-85 ℃, then adding hydrochloric acid, and adjusting the pH value to 6.0-7.0 to obtain a diatomite dispersion;
s2: mixing the diatomite dispersion, the carrying agent and the clay according to a weight ratio of 5:2:1, then reacting at the temperature of 150-170 ℃ for 30-40min, and cooling to the natural room temperature after the reaction is finished;
s3: and then placing the mixture in a hot pressing furnace for molding treatment, and obtaining the diatomite slow release agent after the treatment is finished.
5. The natural preservative for emperor oranges as claimed in claim 4, wherein the pressure of the forming treatment is 1-10MPa, and the treatment time is 10-20 min.
6. The emperor orange natural preservative according to claim 4, characterized in that the carrying agent is wollastonite, the wollastonite is subjected to heat activation treatment at 100-300 ℃ for 20-30min, and the wollastonite carrying agent is obtained after the treatment is finished.
7. The natural citrus reticulata blanco preservative according to claim 6, wherein the wollastonite is obtained by heat activation treatment at 200 ℃ for 25 min.
8. The natural citrus reticulata blanco preservative according to claim 1, wherein the chitosan penetration agent is prepared by the following steps:
s1: adding glacial acetic acid into chitosan, and dissolving;
s2: then adding sodium alginate solution with 10-20% of the total amount of chitosan, stirring at low speed of 300r/min for 10-20min, and finishing stirring;
s3: then the temperature is raised to 70-80 ℃, and the chitosan solvent is stirred for 20-30min at the rotating speed of 500-700r/min to obtain the chitosan solvent.
9. The natural citrus reticulata blanco preservative according to claim 8, wherein the mass fraction of the sodium alginate solution is 10-20%.
10. A method for preparing the natural preservative of emperor oranges according to any one of claims 1 to 9, comprising the following steps:
sequentially adding the plant compound agent, the 2,4-D sodium salt powder, the sorbitan monostearate, the chitosan solvent and the potassium sorbate into a mixer for mixing at the mixing speed of 100-700r/min for 20-30min, then continuing to stir at the speed of 100-300r/min for 10-20min, and finally obtaining the natural citrus reticulata preservative after stirring.
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