CN114946940A - Composite plant preservative and preparation method and application thereof - Google Patents
Composite plant preservative and preparation method and application thereof Download PDFInfo
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- CN114946940A CN114946940A CN202210641744.6A CN202210641744A CN114946940A CN 114946940 A CN114946940 A CN 114946940A CN 202210641744 A CN202210641744 A CN 202210641744A CN 114946940 A CN114946940 A CN 114946940A
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- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
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- FPIPGXGPPPQFEQ-BOOMUCAASA-N Vitamin A Natural products OC/C=C(/C)\C=C\C=C(\C)/C=C/C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-BOOMUCAASA-N 0.000 description 1
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- FPIPGXGPPPQFEQ-OVSJKPMPSA-N all-trans-retinol Chemical compound OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-OVSJKPMPSA-N 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B7/00—Preservation or chemical ripening of fruit or vegetables
- A23B7/16—Coating with a protective layer; Compositions or apparatus therefor
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/30—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests characterised by the surfactants
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
- A01N65/12—Asteraceae or Compositae [Aster or Sunflower family], e.g. daisy, pyrethrum, artichoke, lettuce, sunflower, wormwood or tarragon
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/40—Liliopsida [monocotyledons]
- A01N65/42—Aloeaceae [Aloe family] or Liliaceae [Lily family], e.g. aloe, veratrum, onion, garlic or chives
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
- A01P3/00—Fungicides
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
Abstract
The invention belongs to the technical field of food preservation, and particularly relates to a composite plant preservative, a preparation method and application thereof, wherein the composite plant preservative is prepared from the following raw materials in parts by weight: 4-6 parts of burdock extract, 8-12 parts of dried ballonflower extract, 5-8 parts of pomegranate leaf extract, 15-18 parts of garlic extract, 1-3 parts of chitosan, 1-3 parts of citric acid, 1-3 parts of emulsifier and 100 parts of water; the method is suitable for keeping strawberries fresh when the strawberries are on the market in large quantities, and reduces economic loss caused by rotten strawberries while maintaining the quality of the strawberries.
Description
Technical Field
The invention belongs to the technical field of food preservation, and particularly relates to a composite plant preservative and a preparation method and application thereof.
Background
The strawberry is rich in nutrient components, contains fructose, sucrose, citric acid, malic acid, salicylic acid, amino acid, calcium, phosphorus, iron and other mineral substances, also contains various vitamins, particularly contains very rich vitamin C, 60 mg of vitamin C is contained in every 100 g of strawberry, carotene contained in the strawberry is an important substance for synthesizing vitamin A, has the effects of improving eyesight and nourishing liver, and the strawberry also contains pectin and rich dietary fibers, can help digestion and defecate smoothly, has fragrant and sweet taste, and is popular with people.
The strawberry is gathered and is listed on the market, if not in time selling the processing, cause a large amount of strawberries to pile up very easily, but the strawberry fruit surface is softer, through extrusion or water stain soaking after, the very easy rotten of surface pulp, difficult storage, therefore how to carry out timely fresh-keeping processing to the strawberry after gathering, is keeping the strawberry quality, reduces economic loss's key.
At present, the strawberry preservation method comprises the following steps: most commonly, the fresh-keeping time is short because the fresh-keeping is carried out directly after picking; in addition, the strawberry preservative is used for processing, but the components of the preservative mostly contain food additives, and the strawberry is soaked in the preservative, so that the additives can be soaked in the strawberry, and the strawberry is not easy to clean, and the quality of the strawberry is influenced; therefore, on the premise of maintaining the quality of the strawberries, the problem to be solved is to prolong the preservation time of the strawberries.
Disclosure of Invention
In order to solve the technical problems, the invention provides a composite plant preservative and a preparation method and application thereof.
The invention is realized by the following technical scheme.
The invention aims to provide a composite plant preservative, which consists of the following raw materials in parts by weight:
4-6 parts of burdock extract, 8-12 parts of dried ballonflower extract, 5-8 parts of pomegranate leaf extract, 15-18 parts of garlic extract, 1-3 parts of chitosan, 1-3 parts of citric acid, 1-3 parts of emulsifier and 100 parts of water.
Preferably, the preparation method of the burdock extract comprises the following steps:
cleaning fresh burdock, soaking the burdock in 1-2% citric acid solution, drying, crushing and sieving the burdock for later use;
soaking the treated burdock and 60-70% ethanol at normal temperature for 8-12 hours according to the solid-to-liquid ratio of 1 g: 10-30ml, then heating and refluxing for 1-2 hours, cooling to room temperature, filtering, and removing the solvent from the filtrate by rotary evaporation to obtain the burdock extract.
Preferably, the preparation method of the dried ballonflower extract comprises the following steps:
cleaning, drying and crushing the dried ballonflower to prepare dried ballonflower powder; mixing the dried moss powder with 60-80% of ethanol according to a solid-liquid ratio of 1 g: mixing 10-20ml, ultrasonic extracting at 300-400W for 20-30min, filtering, and removing solvent by rotary evaporation to obtain dried moss extract.
Preferably, the preparation method of the pomegranate leaf extract comprises the following steps:
cleaning, drying and crushing pomegranate leaves, and mixing the pomegranate leaves according to a solid-to-liquid ratio of 1 g: adding 10-30ml of water, carrying out water bath at 50-60 ℃ for 1-2h, filtering, and mixing filter residues according to a solid-to-liquid ratio of 1 g: adding 10-20ml water, water bathing at 50-60 deg.C for 0.5-1h, filtering, mixing the filtrates, and concentrating to 1-1.5g/ml to obtain folium Granati extract.
Preferably, the preparation method of the garlic extract comprises the following steps:
peeling and crushing garlic, and mixing the garlic with the garlic according to a solid-liquid ratio of 1: adding ethyl acetate into 10-20ml, reflux extracting at 70-80 deg.C for 5-6 hr to obtain extractive solution, and concentrating to 1-2g/ml to obtain Bulbus Allii extract.
The second purpose of the invention is to provide a preparation method of the composite plant preservative, which comprises the following steps:
s1, respectively weighing the following raw materials in parts by weight: 4-6 parts of burdock extract, 8-12 parts of dried ballonflower extract, 5-8 parts of pomegranate leaf extract, 15-18 parts of garlic extract, 1-3 parts of chitosan, 1-3 parts of citric acid, 1-3 parts of emulsifier and 100 parts of water;
s2, mixing the raw materials weighed in the S1, stirring, and placing at 30 ℃ to form a uniform solution, thereby obtaining the composite plant preservative.
The third purpose of the invention is to provide the application of the composite plant preservative in strawberry preservation, and the specific method is as follows:
before the strawberries are harvested, spraying the compound plant preservative diluted by water when the strawberries grow to be 6 mature, continuously spraying for 2-3 days, and picking the strawberries when the strawberries grow to be 8 mature; the dilution multiple of the composite plant preservative is 20-50 times;
spraying the composite plant preservative at 30 ℃ again on the picked strawberries, naturally airing, placing in a polyethylene film bag with air holes, and storing in an environment with the temperature of 3-7 ℃ and the humidity of 80% -90%.
Compared with the prior art, the invention has the following beneficial effects:
the preservative is prepared by compounding plant extracts with a sterilization function, sterilization components are burdock extracts, dried ivy mosses extracts, pomegranate leaf extracts and garlic extracts, and the components are combined to have a strong sterilization effect, so that the preservative can prevent strawberries from rotting when being sprayed on the surfaces of the strawberries; in addition, tremella polysaccharide is added, and is used as an emulsifier, so that a uniform system can be formed in the system; the strawberry preservative is also added with chitosan and citric acid, the chitosan forms a solution in the aqueous solution by adding the citric acid, a layer of protective film is formed on the surface of the strawberry by a system at low temperature, the strawberry is isolated from the external environment, the protective film is coated on the outer side of the strawberry due to certain hardness, the effect of preventing extrusion can be achieved, and the strawberry can be prevented from being damaged due to mutual extrusion even though the strawberries are stacked and stored;
when in actual use, before the strawberry is gathered, six ripe, earlier with the preservative spraying of dilution, clear away the harmful microorganism on strawberry surface, later when picking, again with the preservative spraying on the strawberry surface, the harmful microorganism on strawberry surface is less this moment, the preservative can form the protecting film on the strawberry surface in the low temperature environment, with strawberry and external isolated, do not contain harmful microorganism in the protecting layer promptly, simultaneously prevent the invasion of microorganism to the strawberry in the external environment, make the strawberry avoid the erosion and rot of environmental microorganism, can prevent the evaporation of strawberry moisture simultaneously, thereby the effectual strawberry freshness date that has prolonged, the method is fresh-keeping when being fit for a large amount of marketings of strawberry, when keeping the strawberry quality, also reduced because of the economic loss that the strawberry rot caused.
Detailed Description
In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following examples and data are provided for further illustration, but the examples are not intended to limit the present invention. The experimental methods and the detection methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
The preparation method of the burdock extract related in the following embodiments comprises the following steps:
cleaning fresh burdock, soaking with 1% citric acid solution, drying, pulverizing, and sieving;
soaking the treated burdock and 60% ethanol at normal temperature for 12 hours according to the solid-liquid ratio of 1g to 30ml, then heating and refluxing for 2 hours, cooling to room temperature, filtering, and removing the solvent from the filtrate by rotary evaporation to obtain the burdock extract.
The preparation method of the dried ballonflower extract comprises the following steps:
cleaning, drying and crushing the dried moss to prepare dried moss powder; mixing the dried moss powder with 80% of ethanol according to a solid-liquid ratio of 1 g: mixing 20ml, ultrasonic extracting at 400W for 30min, filtering, and rotary evaporating the filtrate to remove solvent to obtain dried moss extract.
The preparation method of the pomegranate leaf extract comprises the following steps:
cleaning, drying and crushing pomegranate leaves, and mixing the pomegranate leaves according to a solid-to-liquid ratio of 1 g: adding 10ml of water, carrying out water bath at 60 ℃ for 1h, filtering, and mixing filter residues according to a solid-to-liquid ratio of 1 g: adding water into 20ml, water bathing at 60 deg.C for 0.5 hr, filtering, mixing the filtrates, and concentrating to 1-1.5g/ml to obtain folium Granati extract.
The preparation method of the garlic extract comprises the following steps:
peeling and crushing garlic, and mixing the garlic with the garlic according to a solid-liquid ratio of 1: adding ethyl acetate into 20ml, reflux extracting at 70-80 deg.C for 5-6 hr to obtain extractive solution, and concentrating to 1-2g/ml to obtain Bulbus Allii extract.
The emulsifier in the examples below is tween 20.
Example 1
A composite plant preservative is composed of the following raw materials in parts by weight:
4 parts of burdock extract, 8 parts of dried ballonflower extract, 5 parts of pomegranate leaf extract, 15 parts of garlic extract, 1 part of chitosan, 1 part of citric acid, 1 part of emulsifier and 100 parts of water.
The preparation method of the composite plant preservative comprises the following steps:
s1, respectively weighing the following raw materials in parts by weight: 4 parts of burdock extract, 8 parts of dried ballonflower extract, 5 parts of pomegranate leaf extract, 15 parts of garlic extract, 1 part of chitosan, 1 part of citric acid, 1 part of emulsifier and 100 parts of water;
s2, mixing the raw materials weighed in the S1, stirring, and placing at 30 ℃ to form a uniform solution, thereby obtaining the composite plant preservative.
A strawberry preservation method comprises the following specific steps:
before the strawberries are harvested, spraying the diluted compound plant preservative when the strawberries grow to 6 ripens, continuously spraying for 2 days, and picking the strawberries when the strawberries grow to 8 ripens; the dilution multiple of the composite plant preservative is 20 times;
spraying the composite plant preservative at 30 ℃ again on the picked strawberries, naturally airing, placing in a polyethylene film bag with air holes, and storing in an environment with the temperature of 3 ℃ and the humidity of 80%.
Example 2
A composite plant preservative is composed of the following raw materials in parts by weight:
6 parts of burdock extract, 12 parts of dried ballonflower extract, 8 parts of pomegranate leaf extract, 18 parts of garlic extract, 3 parts of chitosan, 1 part of citric acid, 3 parts of emulsifier and 100 parts of water.
The preparation method of the composite plant preservative comprises the following steps:
s1, respectively weighing the following raw materials in parts by weight: 6 parts of burdock extract, 12 parts of dried ballonflower extract, 8 parts of pomegranate leaf extract, 18 parts of garlic extract, 3 parts of chitosan, 1 part of citric acid, 3 parts of emulsifier and 100 parts of water;
s2, mixing the raw materials weighed in the S1, stirring, and placing at 30 ℃ to form a uniform solution, thereby obtaining the composite plant preservative.
A strawberry preservation method comprises the following specific steps:
before the strawberries are harvested, spraying the diluted compound plant preservative when the strawberries grow to 6 mature, continuously spraying for 2-3 days, and picking the strawberries when the strawberries grow to 8 mature; the dilution multiple of the composite plant preservative is 50 times;
spraying the composite plant preservative at 30 ℃ again on the picked strawberries, naturally airing, placing in a polyethylene film bag with air holes, and storing in an environment with 7 ℃ and 80% of humidity.
Example 3
A composite plant preservative is composed of the following raw materials in parts by weight:
5 parts of burdock extract, 10 parts of dried ballonflower extract, 6 parts of pomegranate leaf extract, 16 parts of garlic extract, 2 parts of chitosan, 2 parts of citric acid, 2 parts of emulsifier and 100 parts of water.
The preparation method of the composite plant preservative comprises the following steps:
s1, respectively weighing the following raw materials in parts by weight: 5 parts of burdock extract, 10 parts of dried ballonflower extract, 6 parts of pomegranate leaf extract, 16 parts of garlic extract, 2 parts of citric acid, 2 parts of emulsifier and 100 parts of water;
s2, mixing and stirring the raw materials weighed in the S1, and placing the mixture at 30 ℃ to form a uniform solution, thereby preparing the composite plant preservative.
A strawberry preservation method comprises the following specific steps:
before the strawberries are harvested, spraying the diluted compound plant preservative when the strawberries grow to be 6 mature, continuously spraying for 2-3 days, and picking the strawberries when the strawberries grow to be 8 mature; the dilution multiple of the composite plant preservative is 30 times;
spraying the composite plant preservative at 30 ℃ again on the picked strawberries, naturally airing, placing in a polyethylene film bag with air holes, and storing in an environment with the temperature of 4 ℃ and the humidity of 90%.
Comparative example 1
Directly refrigerating strawberry.
Comparative example 2
A composite plant preservative, the composition of which is the same as that of the embodiment 1;
a strawberry preservation method comprises the following specific steps:
spraying the composite plant preservative at 30 ℃ on the picked strawberries, naturally airing, placing in a polyethylene film bag with air holes, and storing in an environment with the temperature of 3 ℃ and the humidity of 80%.
Comparative example 3
A composite plant preservative, the composition of which is the same as that of the embodiment 1;
a strawberry preservation method comprises the following specific steps:
before the strawberries are harvested, spraying the diluted compound plant preservative when the strawberries grow to 6 ripens, continuously spraying for 2 days, and picking the strawberries when the strawberries grow to 8 ripens; the dilution multiple of the composite plant preservative is 20 times;
spraying the composite plant preservative at 10 ℃ again on the picked strawberries, naturally airing, placing in a polyethylene film bag with air holes, and storing in an environment with the temperature of 3 ℃ and the humidity of 80%.
In order to examine the effects of the preservatives prepared in the above examples and comparative examples, antibacterial tests were carried out as follows, and the results are shown in table 1:
TABLE 1 bacteriostatic effect of the antistaling agent prepared in the above example
As can be seen from the results in Table 1, the preservative prepared by the invention has a good bacteriostatic effect.
The following tests were performed on the freshness of strawberries, taking the start of decay of strawberry fruits as the freshness cut-off time, and the results are shown in table 2:
TABLE 2 shelf life of strawberries in the above examples and comparative examples
Sample (I) | Fresh-keeping time (Tian) |
Example 1 | 65 |
Example 2 | 61 |
Example 3 | 67 |
Comparative example 1 | 9 |
Comparative example 2 | 52 |
The strawberries after the freshness retaining treatment of example 1 and comparative example 3 were placed in a square box, the box was periodically shaken to cause squeezing collision between the strawberries, and after 2 weeks, the strawberry condition was observed, and the results are shown in table 3:
table 3 example 1 and comparative example 3 strawberry crush test data
Sample (I) | Crushing breakage rate of strawberry |
Example 1 | 12.5% |
Comparative example 3 | 30.4% |
As can be seen from table 2, the harvested strawberries are directly refrigerated at low temperature and start to decay after 9 days of preservation, but the preservation method of the present invention greatly improves the preservation effect and can preserve at least 60 days, while the comparative example 2 does not carry out preservation treatment before harvesting, and the preservation period after harvesting is shorter than that of the present invention, which shows that the present invention adopts preservation before harvesting and preservation after harvesting, and the two steps are combined, so that the preservation effect is better. As can be seen from table 3, in comparative example 3, after the strawberries are picked and before the strawberries are refrigerated, when the preservative at 10 ℃ is sprayed, and in example 1, the preservative at 30 ℃ is sprayed, after the extrusion test, the strawberry in example 1 has lower extrusion damage than that in comparative example 3, because the spraying is carried out at 30 ℃, the chitosan in the preservative is in a solution state, and at the moment, the spraying is carried out, the preservative can be uniformly sprayed on the surfaces of the strawberries, and then, in the low-temperature refrigeration, the chitosan can form a uniform shell on the surfaces of the strawberries, and even if the strawberries are extruded, the effect of protecting the strawberries can also be achieved. In contrast, when the chitosan is sprayed at 10 ℃ in the comparative example 3, a uniform solution is not formed, the uniformity of the chitosan on the surfaces of the strawberries cannot be ensured in the spraying process, and the protection effect is poorer than that in the example 1.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that such changes and modifications be included within the scope of the present invention as set forth in the appended claims and their equivalents.
Claims (8)
1. The composite plant preservative is characterized by comprising the following raw materials in parts by weight:
4-6 parts of burdock extract, 8-12 parts of dried ballonflower extract, 5-8 parts of pomegranate leaf extract, 15-18 parts of garlic extract, 1-3 parts of chitosan, 1-3 parts of citric acid, 1-3 parts of emulsifier and 100 parts of water.
2. The composite plant preservative and fresh-keeping agent as claimed in claim 1, wherein the burdock extract is prepared by the following method:
cleaning fresh burdock, soaking the burdock in 1-2% citric acid solution, drying, crushing and sieving the burdock for later use;
soaking the treated burdock and 60-70% ethanol at a solid-to-liquid ratio of 1 g: 10-30ml at normal temperature for 8-12 hours, heating and refluxing for 1-2 hours, cooling to room temperature, filtering, and removing the solvent from the filtrate by rotary evaporation to obtain the burdock extract.
3. The composite plant preservative and fresh-keeping agent as claimed in claim 1, wherein the dried ballonflower extract is prepared by the following method:
cleaning, drying and crushing the dried moss to prepare dried moss powder; mixing the dried moss powder with 60-80% of ethanol according to a solid-liquid ratio of 1 g: mixing 10-20ml, ultrasonic extracting at 300-400W for 20-30min, filtering, and removing solvent by rotary evaporation to obtain dried moss extract.
4. The composite plant preservative and fresh-keeping agent as claimed in claim 1, wherein the pomegranate leaf extract is prepared by the following method:
cleaning, drying and crushing pomegranate leaves, and mixing the pomegranate leaves according to a solid-to-liquid ratio of 1 g: adding 10-30ml of water, carrying out water bath at 50-60 ℃ for 1-2h, filtering, and mixing filter residues according to a solid-to-liquid ratio of 1 g: adding 10-20ml water, water bathing at 50-60 deg.C for 0.5-1h, filtering, mixing the filtrates, and concentrating to 1-1.5g/ml to obtain folium Granati extract.
5. The composite plant preservative according to claim 1, wherein the garlic extract is prepared by the following method:
peeling and crushing garlic, and mixing the garlic with the garlic according to a solid-liquid ratio of 1: adding ethyl acetate into 10-20ml, reflux extracting at 70-80 deg.C for 5-6 hr to obtain extractive solution, and concentrating to 1-2g/ml to obtain Bulbus Allii extract.
6. The preparation method of the composite plant preservative and fresh-keeping agent according to any one of claims 1 to 5, characterized by comprising the following steps:
s1, respectively weighing the following raw materials in parts by weight: 4-6 parts of burdock extract, 8-12 parts of dried ballonflower extract, 5-8 parts of pomegranate leaf extract, 15-18 parts of garlic extract, 1-3 parts of chitosan, 1-3 parts of citric acid, 1-3 parts of emulsifier and 100 parts of water;
s2, mixing the raw materials weighed in the S1, stirring, and placing at 30 ℃ to form a uniform solution, thereby obtaining the composite plant preservative.
7. The use of the composite plant preservative according to any one of claims 1 to 5 in the preservation of strawberries.
8. A strawberry preservation method is characterized by comprising the following steps:
before harvesting, when the strawberries grow to 6 ripeness, spraying the compound plant preservative as claimed in any one of claims 1 to 5 diluted by water, continuously spraying for 2 to 3 days, and when the strawberries grow to 8 ripeness, picking the strawberries; the dilution multiple of the composite plant preservative is 20-50 times;
spraying the composite plant preservative at 30 ℃ again on the picked strawberries, naturally airing, placing in a polyethylene film bag with air holes, and storing in an environment with the temperature of 3-7 ℃ and the humidity of 80% -90%.
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