CN108041406A - A kind of natural complex fresh-keeping film and preparation method thereof - Google Patents
A kind of natural complex fresh-keeping film and preparation method thereof Download PDFInfo
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
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- A23L3/3463—Organic compounds; Microorganisms; Enzymes
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- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
- A23L3/3463—Organic compounds; Microorganisms; Enzymes
- A23L3/3472—Compounds of undetermined constitution obtained from animals or plants
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
- A23L3/358—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D107/00—Coating compositions based on natural rubber
- C09D107/02—Latex
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
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- 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
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Abstract
The present invention provides a kind of natural complex fresh-keeping films and preparation method thereof, oxidation prevention layer that the natural complex fresh-keeping film ecto-entad stacks gradually is formed except oxygen layer and fresh-keeping layer, the oxidation prevention layer is formed a film to obtain by ethylene-vinyl alcohol copolymer hot pressing, described except oxygen layer is made by the raw material of following mass parts：90~100 parts of natural rubber breast, 1~3 part of natural essential oil, 0.1~2 part of cobalt salt, the fresh-keeping layer is made by chitosan masking liquid.The natural complex fresh-keeping film of the present invention passes through oxidation prevention layer, oxygen barrier layer, the synergistic effect of three layers of fresh-keeping layer, with excellent oxygen barrier property and mechanical property, slow down the physiological metabolism and aging of the fresh foods such as fruits and vegetables itself to a certain extent, inhibit the growth of the rotten microorganism of cause, the fresh-keeping effect to fresh foods such as fruits and vegetables is improved, effectively extends the shelf-life of the fresh foods such as fruits and vegetables.
Description
Technical field
The invention belongs to the technical fields of food fresh keeping, and in particular to a kind of natural complex fresh-keeping film for food packaging storage
And preparation method thereof.
Background technology
At present, the means that domestic and international food fresh keeping mainly uses are divided into physics, chemistry and biological three categories, according to every one kind
The fresh keeping principle of preservation technology is different, and can separate several classifications.Although the method that different fresh-keeping measures are taken is different,
All it is that (ageing process causes rotten microorganism and the moisture of itself by regulating and controlling to influence the three of fruit mouthfeel and quality big influence factors
Evaporation) come what is carried out：It is the aging by the way that the respiration of itself is controlled to inhibit or slow down fruit first；Followed by pass through suppression
The growth for growing to control microorganism of spoilage organisms processed；By controlling the relative humidity of environment and changing the structure of iuntercellular moisture
To achieve the purpose that control internal moisture evaporation.
Preservative film for food fresh keeping is a kind of plastic packing product, usually passes through polymerisation system by masterbatch of ethylene
Into.At present it is known that chitosan be a kind of very valuable natural macromolecular material, have fungistatic effect, good film forming
It can wait, chitosan film is used as preservative film, has been widely studied.But single Chitosan Film in Food Preservation, fresh-keeping effect are not obvious,
It needs to add bacteriostatic agent or other additives, to improve the effect of its fresh-keeping bacteriostatic.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of compound guarantors for food packaging storage
Fresh film and preparation method thereof.
Technical scheme is as follows：
The present invention provides a kind of natural complex fresh-keeping film, oxidation prevention layer which stacks gradually, deoxygenation
Layer and fresh-keeping layer composition, oxidation prevention layer is formed a film to obtain by ethylene-vinyl alcohol copolymer hot pressing, except oxygen layer passes through the original of following mass parts
Material is made：90~100 parts of natural rubber breast, 1~3 part of natural essential oil, 0.1~2 part of cobalt salt, fresh-keeping layer is by chitosan masking liquid system
.
The natural complex fresh-keeping film of the present invention is combined by oxidation prevention layer, oxygen barrier layer, three layers of fresh-keeping layer, has excellent mechanical property
It can and hinder oxygen, deoxygenation, antibacterial, fresh-keeping function.
Preferably, ethylene segment content is 25~45% in ethylene-vinyl alcohol copolymer, and alcoholysis degree is 96%~100%.
Preferably, the solid content of the natural rubber breast is 40~50%.
Preferably, the natural essential oil is tea tree ethereal oil, cinnamon essential oil, stays Lenzin oil, Herba Origani Vulgaris quintessence oil, clore basil essence
One or more in oil, galic essential oil, thyme essential oil.
Preferably, the fresh-keeping layer includes the raw material of following mass parts：1~3 part of chitosan, 2~6 parts of polyvinyl alcohol, second
90~100 parts of acid, 1~2 part of glycerine, 0.1~0.5 part of natural essential oil.It is more highly preferred to, the molecular weight of the polyvinyl alcohol is
10000~500000, alcoholysis degree is 90~100%.The natural essential oil is tea tree ethereal oil, cinnamon essential oil, stays Lenzin oil, wild marjoram
One or more in essential oil, clore basil essential oil, galic essential oil, thyme essential oil.
The present invention also provides the preparation method of the natural complex fresh-keeping film, this method comprises the following steps：
(1) ethylene-vinyl alcohol copolymer hot pressing is formed a film to obtain oxidation prevention layer；
(2) it will be poured into after chitosan masking liquid mixing in mold, take film after drying off, obtain fresh-keeping layer；
(3) by natural rubber breast, natural essential oil and the cobalt salt of the mass parts after mixing, coating fluid is obtained；
(4) coating fluid is coated onto oxidation prevention layer upper surface, after hanging 1~2h at 25~35 DEG C, composite fresh-keeping layer, makes on it
The natural complex fresh-keeping film is obtained after being rolled with laminating machine.
Preferably, in step (1), the temperature of hot pressing is 180~200 DEG C, and pressure is 2~4MPa, and the time is 3~5min.
Preferably, in step (2), after coating fluid is poured into mold, mold is placed in vacuum drying chamber, at 25-35 DEG C
Dry 18-24h.
Beneficial effects of the present invention are：The present invention natural complex fresh-keeping film by oxidation prevention layer, oxygen barrier layer, three layers of fresh-keeping layer association
Same-action has excellent oxygen barrier property and mechanical property, slows down the fresh foods such as fruits and vegetables itself to a certain extent
Physiological metabolism and aging inhibit to cause the growth of rotten microorganism, improve the fresh-keeping effect to fresh foods such as fruits and vegetables, effectively extend fruit
The shelf-life of the fresh foods such as vegetable.
Specific embodiment
Technical solution of the present invention is illustrated to be clearer, below in conjunction with specific embodiment to the skill of the present invention
Art scheme is further elaborated：
One of technical solution provided by the invention is：
The present invention provides a kind of natural complex fresh-keeping film, oxidation prevention layer which stacks gradually, deoxygenation
Layer and fresh-keeping layer composition, oxidation prevention layer is formed a film to obtain by ethylene-vinyl alcohol copolymer hot pressing, except oxygen layer passes through the original of following mass parts
Material is made：90~100 parts of natural rubber breast, 1~3 part of natural essential oil, 0.1~2 part of cobalt salt, fresh-keeping layer is by chitosan masking liquid system
.
The present invention natural complex fresh-keeping film be combined by oxidation prevention layer, oxygen barrier layer, fresh-keeping layer, have excellent resistance oxygen, deoxygenation,
Antibacterial, fresh-keeping function.
The oxidation prevention layer is formed a film to obtain by ethylene-vinyl alcohol copolymer hot pressing, and ethylene-vinyl alcohol copolymer has excellent
Gas barrier property and other excellent performances (such as oil resistant, organic solvent resistance are good, and glossiness is good, and printing performance is good etc.),
It is made to have a wide range of applications in food packaging neighborhood.But ethylene-vinyl alcohol copolymer hydroxyl is easy to moisture absorption, it can be destroyed after moisture absorption
Intermolecular force makes its gas barrier property decrease, with oxygen barrier layer, fresh-keeping layer it is compound after well solved above-mentioned ask
Topic.
Comprising natural rubber breast in the raw material except oxygen layer, natural rubber breast is the aqua type colloid body of natural rubber
System has extremely strong tack and workability, good film-forming property.Natural rubber with gather cis Isosorbide-5-Nitrae-isoprene based on,
Containing a large amount of unsaturated double-bonds on strand, can react under certain catalytic condition with oxygen, so as to reach oxygen uptake
Purpose.
The fresh-keeping layer is chitosan film, and the sterilized water needed for packaging is not achieved in the limited antibacterial activity of pure chistosan film
Flat, addition natural essential oil can enhance its antibacterial activity in the present invention, expand application range.
Preferably, ethylene segment content is 25~45% in ethylene-vinyl alcohol copolymer, and alcoholysis degree is 96%~100%.
Above-mentioned ethylene-vinyl alcohol copolymer has oxygen good barrier property, can be cooperateed with after hot pressing film forming with oxygen barrier layer and fresh-keeping layer
Effect so that natural complex fresh-keeping film obtained has excellent oxygen resistance.
Preferably, the solid content of the natural rubber breast is 40~50%.Containing big on the strand of the natural rubber
Unsaturated double-bond is measured, can be reacted under certain catalytic condition with oxygen, generates macromolecule polyalcohol.
Preferably, the natural essential oil is tea tree ethereal oil, cinnamon essential oil, stays Lenzin oil, Herba Origani Vulgaris quintessence oil, clore basil essence
One or more in oil, galic essential oil, thyme essential oil.Above-mentioned natural essential oil has the growth for causing pythium spp, bacterium etc.
Inhibition and extinction effects.
Preferably, the fresh-keeping layer includes the raw material of following mass parts：1~3 part of chitosan, 2~6 parts of polyvinyl alcohol, second
90~100 parts of acid, 1~2 part of glycerine, 0.1~0.5 part of natural essential oil.Wherein, chitosan forms the film with some strength.
Preferably, the molecular weight of the polyvinyl alcohol is 10000~500000, and alcoholysis degree is 90~100%.The poly- second
Enol can promote chitosan to form a film well.
Preferably, the natural essential oil is tea tree ethereal oil, cinnamon essential oil, stays Lenzin oil, Herba Origani Vulgaris quintessence oil, clore basil essence
One or more in oil, galic essential oil, thyme essential oil.The natural essential oil is added, makes fresh-keeping layer that there is good antibacterial
Property.
Technical solution provided by the invention second is that：
The present invention also provides a kind of preparation method of the natural complex fresh-keeping film, this method comprises the following steps：
(1) ethylene-vinyl alcohol copolymer hot pressing is formed a film to obtain oxidation prevention layer；
(2) it will be poured into after chitosan masking liquid mixing in mold, take film after drying off, obtain fresh-keeping layer；
(3) by natural rubber breast, natural essential oil and the cobalt salt of the mass parts after mixing, coating fluid is obtained；
(4) coating fluid is coated onto oxidation prevention layer upper surface, after hanging 1~2h at 25~35 DEG C, composite fresh-keeping layer, makes on it
The natural complex fresh-keeping film is obtained after being rolled with laminating machine.
The preparation method of the present invention is simple, and the tensile strength of natural complex fresh-keeping film obtained is big, has excellent mechanical property.
Wherein, in step (1), the temperature of hot pressing is 180~200 DEG C, and pressure is 2~4MPa, and the time is 3~5min.Step
Suddenly in (2), after coating fluid is poured into mold, mold is placed in vacuum drying chamber, dries 18-24h at 25-35 DEG C.
Embodiment 1
A kind of natural complex fresh-keeping film ecto-entad is sequentially laminated with oxidation prevention layer, except oxygen layer and fresh-keeping layer, and the oxidation prevention layer is by second
Alkene-ethenol copolymer (ethylene segment content is 25%, alcoholysis degree 100%) hot pressing forms a film to obtain, described except oxygen layer passes through
The raw material of following mass parts is made：Natural rubber breast 90 parts (solid contents 40%), 2 parts of tea tree ethereal oil, 2 parts of cobalt salt, the guarantor
Fresh layer is made by chitosan masking liquid, and the fresh-keeping layer includes the raw material of following mass parts：3 parts of chitosan, 4 parts of polyvinyl alcohol, second
90 parts of acid, 1 part of glycerine, 0.1 part of cinnamon essential oil.
The preparation method of the natural complex fresh-keeping film comprises the following steps：
(1) by 4g ethylene-vinyl alcohol copolymers hot pressing 3min in a mold, oxidation prevention layer is obtained, the temperature of hot pressing is 180
DEG C, pressure 4MPa；
(2) 3g chitosans are weighed respectively and 4g polyvinyl alcohol is added in 90g acetic acid solutions (volume fraction 2%), side
Stirring side adds in 0.1g cinnamon essential oils in the solution, and mechanical agitation 30min obtains homogeneous solution；Then 1g glycerine, machinery are added in
Film liquid is obtained into after stirring 1h, 4h will be stood at room temperature into film liquid to bubble-free, then mixed liquor is poured into mold, is placed in
20h is dried in vacuum drying chamber, at 30 DEG C to complete drying, film is taken off, obtains fresh-keeping layer；
(3) by 90g natural rubbers breast, 2g tea tree ethereal oils and 2g cobalt salts after mixing, coating fluid is obtained；
(4) coating fluid is coated onto oxidation prevention layer upper surface, after hanging 2h at 25 DEG C, composite fresh-keeping layer, uses overlay film on it
Machine obtains the natural complex fresh-keeping film after rolling 3 times.
The tensile strength of natural complex fresh-keeping film made from embodiment 1 is 112.38MPa, has compared with comparative example and significantly carries
Height shows that the mechanical property of the natural complex fresh-keeping film of the present invention is significantly improved.
The natural complex fresh-keeping film is used for the packaging of cherry tomato, the rotting rate of cherry tomato to be 5% after storing 10 days, vitamin
C conservation rates are 72%, use it for the packaging of grape, and the rotting rate of grape is 12% after storing 10 days, and vitamin C conservation rate is
93%；The packaging of spinach is used it for, the rotting rate of spinach is 12% after storing 10 days, and vitamin C conservation rate is 94%；By its
For the packaging of fresh kidney beans, the rotting rate of fresh kidney beans is 7% after storing 10 days, and vitamin C conservation rate is 95%.Show answering for the present invention
Food Shelf-life can effectively be extended by closing preservative film.
Embodiment 2
A kind of natural complex fresh-keeping film ecto-entad is sequentially laminated with oxidation prevention layer, except oxygen layer and fresh-keeping layer, and the oxidation prevention layer is by second
Alkene-ethenol copolymer (ethylene segment content be 35%, alcoholysis degree 98%) hot pressing forms a film to obtain, it is described except oxygen layer by with
The raw material of lower mass parts is made：Natural rubber breast 95 parts (solid contents 45%), 1 part of galic essential oil, 2 parts of thyme essential oil, cobalt
0.5 part of salt, the fresh-keeping layer is made by chitosan masking liquid, and the fresh-keeping layer includes the raw material of following mass parts：2 parts of chitosan,
6 parts of polyvinyl alcohol, 95 parts of acetic acid, 1.5 parts of glycerine, 0.4 part of tea tree ethereal oil.
The preparation method of the natural complex fresh-keeping film comprises the following steps：
(1) by 5g ethylene-vinyl alcohol copolymers hot pressing 4min in a mold, oxidation prevention layer is obtained, the temperature of hot pressing is 190
DEG C, pressure 3MPa；
(2) 2g chitosans are weighed respectively and 6g polyvinyl alcohol is added in 95g acetic acid solutions (volume fraction 2%), side
Stirring side adds in 0.4g tea tree ethereal oils in the solution, and mechanical agitation 30min obtains homogeneous solution；Then 1.5g glycerine, machine are added in
Film liquid is obtained into after tool stirring 1h, 4h will be stood at room temperature into film liquid to bubble-free, then mixed liquor is poured into mold, is put
In vacuum drying chamber, dried at 25 DEG C for 24 hours to complete drying, take film off, obtain fresh-keeping layer；
(3) by 95g natural rubbers breast, 1g galic essential oils, 2g thyme essential oils and 0.5g cobalt salts after mixing, applied
Cloth liquid；
(4) coating fluid is coated onto oxidation prevention layer upper surface, after hanging 1.5h at 30 DEG C, composite fresh-keeping layer on it, using covering
Film machine obtains the natural complex fresh-keeping film after rolling 2 times.
The tensile strength of natural complex fresh-keeping film made from embodiment 2 is 108.26MPa, has compared with comparative example and significantly carries
Height shows that the mechanical property of the natural complex fresh-keeping film of the present invention is significantly improved.
The natural complex fresh-keeping film is used for the packaging of cherry tomato, the rotting rate of cherry tomato to be 5% after storing 10 days, vitamin
C conservation rates are 74%；The packaging of grape is used it for, the rotting rate of grape is 10% after storing 10 days, and vitamin C conservation rate is
94%；The packaging of spinach is used it for, the rotting rate of spinach is 10% after storing 10 days, and vitamin C conservation rate is 95%；By its
For the packaging of fresh kidney beans, the rotting rate of fresh kidney beans is 6% after storing 10 days, and vitamin C conservation rate is 96%.Show answering for the present invention
Food Shelf-life can effectively be extended by closing preservative film.
Embodiment 3
A kind of natural complex fresh-keeping film ecto-entad is sequentially laminated with oxidation prevention layer, except oxygen layer and fresh-keeping layer, and the oxidation prevention layer is by second
Alkene-ethenol copolymer (ethylene segment content be 45%, alcoholysis degree 96%) hot pressing forms a film to obtain, it is described except oxygen layer by with
The raw material of lower mass parts is made：Natural rubber breast 100 parts (solid contents 40%), 1 part of tea tree ethereal oil, 0.1 part of cobalt salt, the guarantor
Fresh layer is made by chitosan masking liquid, and the fresh-keeping layer includes the raw material of following mass parts：1 part of chitosan, 2 parts of polyvinyl alcohol, second
100 parts of acid, 2 parts of glycerine, 0.2 part of cinnamon essential oil, 0.3 part of galic essential oil.
The preparation method of the natural complex fresh-keeping film comprises the following steps：
(1) by 6g ethylene-vinyl alcohol copolymers hot pressing 5min in a mold, oxidation prevention layer is obtained, the temperature of hot pressing is 220
DEG C, pressure 2MPa；
(2) 1g chitosans are weighed respectively and 2g polyvinyl alcohol is added in 100g acetic acid solutions (volume fraction 2%), side
Stirring side adds in 0.2g cinnamon essential oils and 0.3g galic essential oils in the solution, and mechanical agitation 30min obtains homogeneous solution；Then
2g glycerine is added in, film liquid is obtained into after mechanical agitation 1h, 4h will be stood at room temperature into film liquid to bubble-free, then by mixed liquor
It pours into mold, is placed in vacuum drying chamber, 18h is dried at 35 DEG C to complete drying, film is taken off, obtains fresh-keeping layer；
(3) by 100g natural rubbers breast, 1g tea tree ethereal oils and 0.1g cobalt salts after mixing, coating fluid is obtained；
(4) coating fluid is coated onto oxidation prevention layer upper surface, after hanging 1h at 35 DEG C, composite fresh-keeping layer, uses overlay film on it
Machine obtains the natural complex fresh-keeping film after rolling 4 times.
The tensile strength of natural complex fresh-keeping film made from embodiment 3 is 110.5MPa, has compared with comparative example and significantly carries
Height shows that the mechanical property of the natural complex fresh-keeping film of the present invention is significantly improved.
The natural complex fresh-keeping film is used for the packaging of cherry tomato, the rotting rate of cherry tomato to be 6% after storing 10 days, vitamin
C conservation rates are 80%；The packaging of grape is used it for, the rotting rate of grape is 12% after storing 10 days, and vitamin C conservation rate is
94%；The packaging of spinach is used it for, the rotting rate of spinach is 14% after storing 10 days, and vitamin C conservation rate is 95%；By its
For the packaging of fresh kidney beans, the rotting rate of fresh kidney beans is 8% after storing 10 days, and vitamin C conservation rate is 95%.Show answering for the present invention
Food Shelf-life can effectively be extended by closing preservative film.
Comparative example 1
A kind of Chitosan Film in Food Preservation includes the raw material of following mass parts：3 parts of chitosan, 4 parts of polyvinyl alcohol, 90 parts of acetic acid,
1 part of glycerine, 0.1 part of cinnamon essential oil.
The preparation method of the Chitosan Film in Food Preservation is：3g chitosans are weighed respectively and 4g polyvinyl alcohol is added to 90g acetic acid
In solution (volume fraction 2%), 0.1g cinnamon essential oils are added in the solution while stirring, mechanical agitation 30min obtains homogeneous
Solution；Then 1g glycerine is added in, obtains into film liquid after mechanical agitation 1h, 4h will be stood at room temperature into film liquid to bubble-free, so
Mixed liquor is poured into mold afterwards, is placed in vacuum drying chamber, 20h is dried at 30 DEG C to complete drying, film is taken off, obtains described
Chitosan Film in Food Preservation.
The tensile strength of Chitosan Film in Food Preservation made from comparative example 1 is 60.77MPa.
The Chitosan Film in Food Preservation is used for the packaging of cherry tomato, the rotting rate of cherry tomato to be 10% after storing 10 days, dimension
Raw element C conservation rates are 65%；The packaging of grape is used it for, the rotting rate of grape is 30% after storing 10 days, and vitamin C is kept
Rate is 90%, uses it for the packaging of spinach, and the rotting rate of spinach is 42% after storing 10 days, and vitamin C conservation rate is 70%；
The packaging of fresh kidney beans is used it for, the rotting rate of fresh kidney beans is 25% after storing 10 days, and vitamin C conservation rate is 83%.
Comparative example 2
A kind of Chitosan Film in Food Preservation includes the raw material of following mass parts：3 parts of chitosan, 4 parts of polyvinyl alcohol, 90 parts of acetic acid,
1 part of glycerine, 0.1 part of tea tree ethereal oil.
The preparation method of the Chitosan Film in Food Preservation is：3g chitosans are weighed respectively and 4g polyvinyl alcohol is added to 90g acetic acid
In solution (volume fraction 2%), 0.1g tea tree ethereal oils are added in the solution while stirring, mechanical agitation 30min obtains homogeneous
Solution；Then 1g glycerine is added in, obtains into film liquid after mechanical agitation 1h, 4h will be stood at room temperature into film liquid to bubble-free, so
Mixed liquor is poured into mold afterwards, is placed in vacuum drying chamber, 20h is dried at 30 DEG C to complete drying, film is taken off, obtains described
Chitosan Film in Food Preservation.
The tensile strength of Chitosan Film in Food Preservation made from comparative example 2 is 81.25MPa.
The Chitosan Film in Food Preservation is used for the packaging of cherry tomato, the rotting rate of cherry tomato to be 10% after storing 10 days, dimension
Raw element C conservation rates are 62%；The packaging of grape is used it for, the rotting rate of grape is 30% after storing 10 days, and vitamin C is kept
Rate is 86%；The packaging of grape is used it for, the rotting rate of grape is 30% after storing 10 days, and vitamin C conservation rate is 86%；
The packaging of spinach is used it for, the rotting rate of spinach is 40% after storing 10 days, and vitamin C conservation rate is 80%；It uses it for
The packaging of fresh kidney beans, the rotting rate of fresh kidney beans is 20% after storing 10 days, and vitamin C conservation rate is 85%.
Comparative example 3
The tensile strength of common PE preservative films is 18.20MPa.
Common PE preservative films are used for the packaging of cherry tomato, the rotting rate of cherry tomato to be 40% after storing 10 days, dimension life
Plain C conservation rates are 48%；Common PE preservative films are used for the packaging of grape, the rotting rate of grape is 50% after storing 10 days,
Vitamin C conservation rate is 75%, uses it for the packaging of spinach, and the rotting rate of spinach is 58% after storing 10 days, and vitamin C is protected
Holdup is 63%；The packaging of fresh kidney beans is used it for, the rotting rate of fresh kidney beans is 42% after storing 10 days, and vitamin C conservation rate is
45%.
The above is presently preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the present invention
Any modification, equivalent substitution and simple modifications for being made in appearance etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of natural complex fresh-keeping film, which is characterized in that oxidation prevention layer that the natural complex fresh-keeping film ecto-entad stacks gradually, except oxygen layer and
Fresh-keeping layer forms, and oxidation prevention layer is formed a film to obtain by ethylene-vinyl alcohol copolymer hot pressing, except oxygen layer passes through the raw material system of following mass parts
：90~100 parts of natural rubber breast, 1~3 part of natural essential oil, 0.1~2 part of cobalt salt, fresh-keeping layer is made by chitosan masking liquid.
2. natural complex fresh-keeping film according to claim 1, which is characterized in that ethylene segment contains in ethylene-vinyl alcohol copolymer
It measures as 25~45%, alcoholysis degree is 96%~100%.
3. natural complex fresh-keeping film according to claim 1, which is characterized in that the solid content of the natural rubber breast for 40~
50%.
4. natural complex fresh-keeping film according to claim 1, which is characterized in that the natural essential oil is tea tree ethereal oil, cinnamon spirit
Oil stays one or more in Lenzin oil, Herba Origani Vulgaris quintessence oil, clore basil essential oil, galic essential oil, thyme essential oil.
5. natural complex fresh-keeping film according to claim 1, which is characterized in that the fresh-keeping layer includes the original of following mass parts
Material：1~3 part of chitosan, 2~6 parts of polyvinyl alcohol, 90~100 parts of acetic acid, 1~2 part of glycerine, 0.1~0.5 part of natural essential oil.
6. natural complex fresh-keeping film according to claim 5, which is characterized in that the molecular weight of the polyvinyl alcohol for 10000~
500000, alcoholysis degree is 90~100%.
7. natural complex fresh-keeping film according to claim 5, which is characterized in that the natural essential oil is tea tree ethereal oil, cinnamon spirit
Oil stays one or more in Lenzin oil, Herba Origani Vulgaris quintessence oil, clore basil essential oil, galic essential oil, thyme essential oil.
A kind of 8. method for preparing claim 1-7 any one of them natural complex fresh-keeping films, which is characterized in that this method include with
Lower step：
(1) ethylene-vinyl alcohol copolymer hot pressing is formed a film to obtain oxidation prevention layer；
(2) it will be poured into after chitosan masking liquid mixing in mold, take film after drying off, obtain fresh-keeping layer；
(3) by natural rubber breast, natural essential oil and the cobalt salt of the mass parts after mixing, coating fluid is obtained；
(4) coating fluid is coated onto oxidation prevention layer upper surface, after hanging 1~2h at 25~35 DEG C, composite fresh-keeping layer on it, using covering
Film machine obtains the natural complex fresh-keeping film after rolling.
9. the preparation method of natural complex fresh-keeping film according to claim 8, which is characterized in that in step (1), the temperature of hot pressing
For 180~200 DEG C, pressure is 2~4MPa, and the time is 3~5min.
10. the preparation method of natural complex fresh-keeping film according to claim 8, which is characterized in that in step (2), by coating fluid
After pouring into mold, mold is placed in vacuum drying chamber, dries 18-24h at 25-35 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114145335A (en) * | 2021-11-25 | 2022-03-08 | 山东农业大学 | Origanum oil chitosan coating liquid and preparation method thereof |
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