CN112931510A - Chitosan and preparation method thereof - Google Patents
Chitosan and preparation method thereof Download PDFInfo
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- CN112931510A CN112931510A CN202110135123.6A CN202110135123A CN112931510A CN 112931510 A CN112931510 A CN 112931510A CN 202110135123 A CN202110135123 A CN 202110135123A CN 112931510 A CN112931510 A CN 112931510A
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- parts
- solution
- chitosan
- modified
- acetic acid
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- 229920001661 Chitosan Polymers 0.000 title claims abstract description 93
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 123
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical class OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 claims abstract description 67
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000000284 extract Substances 0.000 claims abstract description 53
- 239000008367 deionised water Substances 0.000 claims abstract description 42
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 42
- UDPGUMQDCGORJQ-UHFFFAOYSA-N (2-chloroethyl)phosphonic acid Chemical compound OP(O)(=O)CCCl UDPGUMQDCGORJQ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000005976 Ethephon Substances 0.000 claims abstract description 32
- RZALONVQKUWRRY-FYZOBXCZSA-N 2,3-dihydroxybutanedioic acid;(3r)-3-hydroxy-4-(trimethylazaniumyl)butanoate Chemical compound OC(=O)C(O)C(O)C(O)=O.C[N+](C)(C)C[C@H](O)CC([O-])=O RZALONVQKUWRRY-FYZOBXCZSA-N 0.000 claims abstract description 31
- 229940089161 ginsenoside Drugs 0.000 claims abstract description 31
- 229930182494 ginsenoside Natural products 0.000 claims abstract description 31
- 239000004310 lactic acid Substances 0.000 claims abstract description 31
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 31
- 235000001287 Guettarda speciosa Nutrition 0.000 claims abstract description 15
- 239000000243 solution Substances 0.000 claims description 185
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 114
- 238000003756 stirring Methods 0.000 claims description 94
- 238000010438 heat treatment Methods 0.000 claims description 70
- 239000003292 glue Substances 0.000 claims description 66
- 150000001242 acetic acid derivatives Chemical class 0.000 claims description 52
- 238000002156 mixing Methods 0.000 claims description 52
- 229920002472 Starch Polymers 0.000 claims description 28
- 239000008107 starch Substances 0.000 claims description 28
- 235000019698 starch Nutrition 0.000 claims description 28
- 239000011259 mixed solution Substances 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- 239000008187 granular material Substances 0.000 claims description 18
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 claims description 16
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 claims description 16
- 239000000811 xylitol Substances 0.000 claims description 16
- 229960002675 xylitol Drugs 0.000 claims description 16
- 235000010447 xylitol Nutrition 0.000 claims description 16
- 241000125175 Angelica Species 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 150000004676 glycans Chemical class 0.000 claims description 14
- 229920001282 polysaccharide Polymers 0.000 claims description 14
- 239000005017 polysaccharide Substances 0.000 claims description 14
- 108090000790 Enzymes Proteins 0.000 claims description 12
- 102000004190 Enzymes Human genes 0.000 claims description 12
- 229920002488 Hemicellulose Polymers 0.000 claims description 12
- 239000003242 anti bacterial agent Substances 0.000 claims description 12
- 239000003995 emulsifying agent Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 230000001954 sterilising effect Effects 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000000292 calcium oxide Substances 0.000 claims description 10
- 235000012255 calcium oxide Nutrition 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 10
- 239000008213 purified water Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 10
- 241000382455 Angelica sinensis Species 0.000 claims description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 2
- 239000005751 Copper oxide Substances 0.000 claims description 2
- 108060004795 Methyltransferase Proteins 0.000 claims description 2
- 108010059820 Polygalacturonase Proteins 0.000 claims description 2
- 229920001214 Polysorbate 60 Polymers 0.000 claims description 2
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 2
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 claims description 2
- MKRNVBXERAPZOP-UHFFFAOYSA-N Starch acetate Chemical compound O1C(CO)C(OC)C(O)C(O)C1OCC1C(OC2C(C(O)C(OC)C(CO)O2)OC(C)=O)C(O)C(O)C(OC2C(OC(C)C(O)C2O)CO)O1 MKRNVBXERAPZOP-UHFFFAOYSA-N 0.000 claims description 2
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 2
- 229910000431 copper oxide Inorganic materials 0.000 claims description 2
- 108010093305 exopolygalacturonase Proteins 0.000 claims description 2
- 108010062085 ligninase Proteins 0.000 claims description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 2
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229950004959 sorbitan oleate Drugs 0.000 claims description 2
- 229950011392 sorbitan stearate Drugs 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 125000000218 acetic acid group Chemical class C(C)(=O)* 0.000 abstract description 2
- 244000061520 Angelica archangelica Species 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 18
- 239000000047 product Substances 0.000 description 11
- 239000009188 angelicae sinensis extract Substances 0.000 description 9
- 230000000844 anti-bacterial effect Effects 0.000 description 5
- 230000005070 ripening Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 235000012055 fruits and vegetables Nutrition 0.000 description 3
- 229920002101 Chitin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MSWZFWKMSRAUBD-IVMDWMLBSA-N 2-amino-2-deoxy-D-glucopyranose Chemical compound N[C@H]1C(O)O[C@H](CO)[C@@H](O)[C@@H]1O MSWZFWKMSRAUBD-IVMDWMLBSA-N 0.000 description 1
- 125000000738 acetamido group Chemical group [H]C([H])([H])C(=O)N([H])[*] 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000001093 anti-cancer Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- MSWZFWKMSRAUBD-UHFFFAOYSA-N beta-D-galactosamine Natural products NC1C(O)OC(CO)C(O)C1O MSWZFWKMSRAUBD-UHFFFAOYSA-N 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000008827 biological function Effects 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 229960002442 glucosamine Drugs 0.000 description 1
- 108010026195 glycanase Proteins 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
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- 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
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/02—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms
- A01N43/04—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom
- A01N43/14—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings
- A01N43/16—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings with oxygen as the ring hetero atom
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- A—HUMAN NECESSITIES
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- 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
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- A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
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- A—HUMAN NECESSITIES
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- A01N37/36—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
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- A01N37/44—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a nitrogen atom attached to the same carbon skeleton by a single or double bond, this nitrogen atom not being a member of a derivative or of a thio analogue of a carboxylic group, e.g. amino-carboxylic acids
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- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
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- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/26—Phosphorus; Compounds thereof
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
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- 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
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- A—HUMAN NECESSITIES
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- A01N65/08—Magnoliopsida [dicotyledons]
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- 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
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- A23B7/154—Organic compounds; Microorganisms; Enzymes
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- 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
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- A23B7/14—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10
- A23B7/153—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of liquids or solids
- A23B7/157—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
- C12P7/18—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic polyhydric
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- 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
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- Plant Pathology (AREA)
- Dentistry (AREA)
- Agronomy & Crop Science (AREA)
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- Chemical & Material Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Microbiology (AREA)
- Inorganic Chemistry (AREA)
- Biotechnology (AREA)
- Natural Medicines & Medicinal Plants (AREA)
- General Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Cosmetics (AREA)
Abstract
The invention discloses a chitosan and a preparation method thereof, wherein the chitosan mainly comprises chitosan gel, the chitosan gel comprises the following components, by weight, 25 parts of chitosan, 13 parts of lactic acid solution, 12 parts of glycerol, 12 parts of modified xylitol, 7 parts of L-carnitine tartrate, 13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and the balance of deionized water.
Description
Technical Field
The invention relates to chitosan, in particular to chitosan and a preparation method thereof.
Background
The chitosan is a product obtained by removing partial acetyl of natural polysaccharide chitin, and has a chemical name: β - (1 → 4) -2-amino-2-deoxy-D-glucose, formula: (C6H11NO4) N, molecular weight of the unit: 161.2 has multiple physiological functions of biodegradability, biocompatibility, nontoxicity, antibacterial, anticancer, blood lipid reducing, and immunity enhancing. The chitosan has good physical, chemical and biological properties, has excellent stability to organic solvents, and is convenient for secondary processing, so the chitosan has wide application prospects in the aspects of food, paper making, printing and dyeing, environmental protection, spinning, water treatment, medical treatment, heavy metal recovery and the like.
The amino group in the chitosan molecular structure has stronger reactivity than the acetamido group in the chitin molecule, so that the polysaccharide has excellent biological function and can carry out chemical modification reaction. Therefore, chitosan is considered as a functional biomaterial having a greater potential for application than cellulose, glucosamine is the basic constitutional unit of chitosan, chitosan is the sugar unit of the basic structure of chitosan, and the final product obtained by naturally degrading chitosan with chitosan glycanase is chitosan. The existing chitosan can not meet the requirements of people in the aspects of antibacterial property, air permeability and ripening of fruits and vegetables.
Disclosure of Invention
The present invention is directed to a chitosan that solves the problems set forth above in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a chitosan mainly comprises chitosan gel, wherein the chitosan gel comprises the following components in parts by weight: 20-30 parts of chitosan, 10-15 parts of lactic acid solution, 10-15 parts of glycerol, 10-15 parts of modified xylitol, 4-10 parts of L-carnitine tartrate, 10-15 parts of modified acetic acid, 3-5 parts of ethephon, 0.5-1.5 parts of ginsenoside extract, 0.5-1.5 parts of angelica extract and the balance of deionized water.
As a further scheme of the invention: the chitosan gel comprises the following components in parts by weight: 22-28 parts of chitosan, 11-14 parts of lactic acid solution, 11-14 parts of glycerol, 11-14 parts of modified xylitol, 5-9 parts of L-carnitine tartrate, 11-14 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica sinensis extract and the balance of deionized water.
As a still further scheme of the invention: the chitosan gel comprises the following components in parts by weight: 24-26 parts of chitosan, 12-13 parts of lactic acid solution, 12-13 parts of glycerol, 12-13 parts of modified xylitol, 6-8 parts of L-carnitine tartrate, 12-13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica sinensis extract and the balance of deionized water.
As a still further scheme of the invention: 25 parts of chitosan, 13 parts of lactic acid solution, 12 parts of glycerol, 12 parts of modified xylitol, 7 parts of L-carnitine tartrate, 13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and the balance of deionized water.
As a still further scheme of the invention: 5. the preparation method of the modified xylitol comprises the following steps:
s1: cleaning pericarp, cutting into pieces, and repeating with purified water for 3-5 times to obtain ash-removed granules;
s2: putting the ash-removed particles into a mixed enzyme water solution, heating to 10-20 ℃, and keeping for 10-15h to obtain a mixed solution of enzymolysis hemicellulose and polysaccharide;
s3: heating and concentrating the mixed solution of the enzymolysis hemicellulose and the polysaccharide, mixing with 1 percent of sulfuric acid, uniformly stirring, heating to 100 ℃ and 110 ℃, and keeping for 20-40min to obtain an acidolysis solution;
s4: adding quicklime and a pH regulator into the acidolysis solution, and regulating the pH value to 7-9;
s5: adding active carbon until the solution is completely decolorized, then separating solid content, and reserving the solution, wherein the solution is the required xylitol solution;
s6: putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain the modified xylitol.
As a still further scheme of the invention: the mixed enzyme water solution is a mixed solution of a pectinase water solution, a ligninase water solution and a helicase water solution.
As a still further scheme of the invention: the preparation method of the modified acetic acid comprises the following steps:
s1: preparing an acetic acid aqueous solution;
s2: adding starch into the acetic acid solution to react for a period of time to obtain acetic acid starch, and mixing;
s3: adding glycerol into the mixed solution of the starch acetate, and stirring and mixing;
s4: putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃;
s5: performing microwave treatment, heating at 110 deg.C for 20min, standing, and cooling to obtain modified acetic acid.
As a still further scheme of the invention: the emulsifier is a mixture of sorbitan oleate and polyoxyethylene sorbitan stearate.
As a still further scheme of the invention: the antibacterial agent is one or more of zinc oxide, copper oxide, ammonium dihydrogen phosphate and lithium carbonate.
As a still further scheme of the invention: the method comprises the following steps:
s1, taking 25 parts by weight of chitosan, 13 parts by weight of lactic acid solution, 12 parts by weight of glycerol, 12 parts by weight of modified xylitol, 7 parts by weight of L-carnitine tartrate, 13 parts by weight of modified acetic acid, 4 parts by weight of ethephon, 1 part by weight of ginsenoside extract, 1 part by weight of angelica extract and deionized water for later use;
s2, placing the chitosan and lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s3, adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s4, adding ethephon, the ginsenoside extract, the angelica extract and the residual deionized water into the mixed glue solution B, and fully stirring and mixing to obtain a mixed glue solution C;
and S5, adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Compared with the prior art, the invention has the beneficial effects that:
according to the preparation method of the chitosan, the modified xylitol and the modified acetic acid are added, so that the air permeability, the antibacterial property and the ripening rate of the chitosan are greatly improved, ethephon is added, the ripening of fruits and vegetables is further promoted, and the problem that the existing chitosan cannot meet the requirements of the antibacterial property, the air permeability and the ripening of fruits and vegetables at the same time is solved.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to specific embodiments.
Example 1
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 25 parts of chitosan, 13 parts of lactic acid solution, 12 parts of glycerol, 12 parts of modified xylitol, 7 parts of L-carnitine tartrate, 13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica sinensis extract and deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Example 2
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 20 parts of chitosan, 10 parts of lactic acid solution, 10 parts of glycerol, 10 parts of modified xylitol, 4 parts of L-carnitine tartrate, 10 parts of modified acetic acid, 3 parts of ethephon, 0.5 part of ginsenoside extract, 0.5 part of angelica sinensis extract and the balance of deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Example 3
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 30 parts of chitosan, 15 parts of lactic acid solution, 15 parts of glycerol, 15 parts of modified xylitol, 10 parts of L-carnitine tartrate, 15 parts of modified acetic acid, 5 parts of ethephon, 1.5 parts of ginsenoside extract, 1.5 parts of angelica sinensis extract and the balance of deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Example 4
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 22 parts of chitosan, 11 parts of lactic acid solution, 11 parts of glycerol, 11 parts of modified xylitol, 5 parts of L-carnitine tartrate, 11 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and the balance of deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Example 5
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 28 parts of chitosan, 14 parts of lactic acid solution, 14 parts of glycerol, 14 parts of modified xylitol, 9 parts of L-carnitine tartrate, 14 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and the balance of deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Example 6
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 24 parts of chitosan, 12 parts of lactic acid solution, 12 parts of glycerol, 12 parts of modified xylitol, 6 parts of L-carnitine tartrate, 12 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and the balance of deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Example 7
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 26 parts of chitosan, 13 parts of lactic acid solution, 13 parts of glycerol, 13 parts of modified xylitol, 8 parts of L-carnitine tartrate, 13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and the balance of deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Comparative example 1
A preparation method of chitosan comprises the following steps:
s1: taking xylitol;
s2: preparing modified acetic acid: preparing an acetic acid aqueous solution, adding starch into the acetic acid solution for reacting for a period of time to obtain acetic acid starch, mixing, adding glycerol into the acetic acid starch mixed solution, stirring and mixing, putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃, performing microwave treatment, heating at the temperature of 110 ℃ for 20min, standing and cooling to obtain modified acetic acid;
s3: taking the raw materials in parts by weight, wherein the raw materials comprise: 25 parts of chitosan, 13 parts of lactic acid solution, 12 parts of glycerol, 12 parts of xylitol, 7 parts of L-carnitine tartrate, 13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and deionized water for later use;
s4: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s5: adding glycerol, xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s6: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s7: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
Comparative example 2
A preparation method of chitosan comprises the following steps:
s1: preparing modified xylitol: cleaning pericarp, cutting, repeating with purified water for 3-5 times to obtain ash-removed granules, adding the ash-removed granules into mixed enzyme water solution, heating to 10-20 deg.C, maintaining for 10-15 hr to obtain mixed solution of enzymolysis hemicellulose and polysaccharide, heating and concentrating, mixing with 1% sulfuric acid, stirring, heating to 110 deg.C, maintaining for 20-40min to obtain acidolysis solution, adding quicklime into acidolysis solution, and pH regulator, regulating pH value to 7-9, adding active carbon until the solution is completely decolorized, separating solid content, retaining solution, putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain modified xylitol;
s2: taking the raw materials in parts by weight, wherein the raw materials comprise: 25 parts of chitosan, 13 parts of lactic acid solution, 12 parts of glycerol, 12 parts of modified xylitol, 7 parts of L-carnitine tartrate, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and deionized water for later use;
s3: putting the chitosan and the lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s4: adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s5: adding ethephon, ginsenoside extract, radix Angelicae sinensis extract and the rest deionized water into the mixed glue solution B, and stirring and mixing to obtain mixed glue solution C;
s6: and adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
It is understood from the table that the examples with the modified xylitol and the modified acetic acid added are much higher in antibacterial property, air permeability and ripening performance than the comparative example 1 with the ordinary xylitol and the comparative example 2 without the modified acetic acid, and the ratio of the example 1 is the highest.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. The chitosan gel is characterized by comprising the following components in parts by weight:
20-30 parts of chitosan, 10-15 parts of lactic acid solution, 10-15 parts of glycerol, 10-15 parts of modified xylitol, 4-10 parts of L-carnitine tartrate, 10-15 parts of modified acetic acid, 3-5 parts of ethephon, 0.5-1.5 parts of ginsenoside extract, 0.5-1.5 parts of angelica extract and the balance of deionized water.
2. The chitosan according to claim 1, wherein the chitosan gel comprises the following components in parts by weight:
22-28 parts of chitosan, 11-14 parts of lactic acid solution, 11-14 parts of glycerol, 11-14 parts of modified xylitol, 5-9 parts of L-carnitine tartrate, 11-14 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica sinensis extract and the balance of deionized water.
3. The chitosan according to claim 1, wherein the chitosan gel comprises the following components in parts by weight:
24-26 parts of chitosan, 12-13 parts of lactic acid solution, 12-13 parts of glycerol, 12-13 parts of modified xylitol, 6-8 parts of L-carnitine tartrate, 12-13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica sinensis extract and the balance of deionized water.
4. The chitosan according to claim 1, wherein the chitosan gel comprises the following components in parts by weight:
25 parts of chitosan, 13 parts of lactic acid solution, 12 parts of glycerol, 12 parts of modified xylitol, 7 parts of L-carnitine tartrate, 13 parts of modified acetic acid, 4 parts of ethephon, 1 part of ginsenoside extract, 1 part of angelica extract and the balance of deionized water.
5. The chitosan according to claim 1, wherein said modified xylitol is prepared by a process comprising the steps of:
s1: cleaning pericarp, cutting into pieces, and repeating with purified water for 3-5 times to obtain ash-removed granules;
s2: putting the ash-removed particles into a mixed enzyme water solution, heating to 10-20 ℃, and keeping for 10-15h to obtain a mixed solution of enzymolysis hemicellulose and polysaccharide;
s3: heating and concentrating the mixed solution of the enzymolysis hemicellulose and the polysaccharide, mixing with 1 percent of sulfuric acid, uniformly stirring, heating to 100 ℃ and 110 ℃, and keeping for 20-40min to obtain an acidolysis solution;
s4: adding quicklime and a pH regulator into the acidolysis solution, and regulating the pH value to 7-9;
s5: adding active carbon until the solution is completely decolorized, then separating solid content, and reserving the solution, wherein the solution is the required xylitol solution;
s6: putting the xylitol solution into a temperature-controlled reaction vat, heating to 20-25 ℃, introducing sufficient air, starting stirring at 500rpm of 300-; then heating to 40-45 ℃, slowly introducing air according to the volume of the substrate solution and the flow of 10-15 ml/L.s, stirring at the speed of 120-150 rpm, and reacting for 5-6 h to obtain the modified xylitol.
6. The chitosan according to claim 1, wherein the mixed enzyme aqueous solution is a mixed solution of a pectinase aqueous solution, a ligninase aqueous solution, and a helicase aqueous solution.
7. The chitosan according to claim 1, wherein the preparation method of the modified acetic acid comprises the following steps:
s1: preparing an acetic acid aqueous solution;
s2: adding starch into the acetic acid solution to react for a period of time to obtain acetic acid starch, and mixing;
s3: adding glycerol into the mixed solution of the starch acetate, and stirring and mixing;
s4: putting the uniformly mixed mixture into a reaction vat, adding an emulsifier and an antibacterial agent, heating and stirring at the temperature of 80-100 ℃;
s5: performing microwave treatment, heating at 110 deg.C for 20min, standing, and cooling to obtain modified acetic acid.
8. Chitosan according to claim 1, wherein said emulsifier is a mixture of sorbitan oleate and polyoxyethylene sorbitan stearate.
9. The chitosan according to claim 1, wherein the antibacterial agent is one or more of zinc oxide, copper oxide, ammonium dihydrogen phosphate and lithium carbonate.
10. A process for the preparation of chitosan according to any of claims 1 to 4, characterized by comprising the following steps:
s1, taking 25 parts by weight of chitosan, 13 parts by weight of lactic acid solution, 12 parts by weight of glycerol, 12 parts by weight of modified xylitol, 7 parts by weight of L-carnitine tartrate, 13 parts by weight of modified acetic acid, 4 parts by weight of ethephon, 1 part by weight of ginsenoside extract, 1 part by weight of angelica extract and deionized water for later use;
s2, placing the chitosan and lactic acid solution into a mixer, and fully stirring to obtain a mixed glue solution A;
s3, adding glycerol, modified xylitol and L-carnitine tartrate into the mixed glue solution A, adding half of deionized water, and fully stirring to obtain a mixed glue solution B;
s4, adding ethephon, the ginsenoside extract, the angelica extract and the residual deionized water into the mixed glue solution B, and fully stirring and mixing to obtain a mixed glue solution C;
and S5, adding modified acetic acid into the mixed glue solution C, stirring and mixing, standing, and sterilizing to obtain a chitosan finished product.
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