CN111117125A - Composite antibacterial film and preparation method thereof - Google Patents
Composite antibacterial film and preparation method thereof Download PDFInfo
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- CN111117125A CN111117125A CN201911402580.6A CN201911402580A CN111117125A CN 111117125 A CN111117125 A CN 111117125A CN 201911402580 A CN201911402580 A CN 201911402580A CN 111117125 A CN111117125 A CN 111117125A
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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
- C08J5/18—Manufacture of films or sheets
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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
- 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
-
- 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
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/04—Polyamides derived from alpha-amino carboxylic acids
-
- 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
- C08J2429/00—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
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- 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
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/04—Polyamides derived from alpha-amino carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
Abstract
The invention discloses a composite antibacterial film and a preparation method thereof, and relates to the technical field of food preservation. The raw materials of the composite antibacterial film comprise polyvinyl alcohol, glycerol, water and epsilon-polylysine. The preparation method of the composite antibacterial film comprises the following steps: adding polyvinyl alcohol into water, and soaking until the polyvinyl alcohol absorbs water and swells to obtain a swelling body; heating and melting the swelling body, adding glycerol, and uniformly stirring to form a mixed solution; adding epsilon-polylysine into the mixed solution, stirring, and reacting to generate a film forming solution; and spreading the film liquid in a film forming device, and drying to form a film to obtain the composite antibacterial film. The invention aims to provide a composite antibacterial film with good antibacterial effect so as to prolong the shelf life of food.
Description
Technical Field
The invention relates to the technical field of food preservation, in particular to a composite antibacterial film and a preparation method thereof.
Background
With the improvement of living standard of people, fresh livestock and poultry meat becomes one of essential food on dining tables of people. The shelf life of the fresh meat is prolonged, the commercial value of the product can be improved, and the consumption market of the fresh meat can be expanded.
Polyvinyl alcohol is a degradable environment-friendly plastic material, is widely applied to various fields such as medicine, agriculture, chemical industry, food and the like, and has attracted more and more attention in recent years. However, the pure polyvinyl alcohol film has no bacteriostatic action, and has limited effect of prolonging the shelf life when being used for fresh-keeping of fresh meat.
Disclosure of Invention
The invention mainly aims to provide a composite antibacterial film and a preparation method thereof, and aims to provide the composite antibacterial film with good antibacterial effect.
In order to achieve the purpose, the invention provides a composite antibacterial film, and raw materials of the composite antibacterial film comprise polyvinyl alcohol, glycerol, water and epsilon-polylysine.
Optionally, the composite antibacterial film comprises the following raw materials in parts by weight: 100 parts of water, 1-3 parts of polyvinyl alcohol, 0.5-1.5 parts of glycerol and 1-4 parts of epsilon-polylysine.
Optionally, the composite antibacterial film is prepared from the following raw materials in parts by weight: 100 parts of water, 1-3 parts of polyvinyl alcohol, 0.5-1.5 parts of glycerol and 3-4 parts of epsilon-polylysine.
The invention also provides a preparation method of the composite antibacterial film, which is used for preparing the composite antibacterial film, and the preparation method of the composite antibacterial film comprises the following steps:
adding polyvinyl alcohol into water, and soaking until the polyvinyl alcohol absorbs water and swells to obtain a swelling body;
heating and melting the swelling body, adding glycerol, and uniformly stirring to form a mixed solution;
adding epsilon-polylysine into the mixed solution, stirring, and reacting to generate a film forming solution;
and spreading the film liquid in a film forming device, and drying to form a film to obtain the composite antibacterial film.
Optionally, after the swelling body is heated and melted, adding glycerol, and uniformly stirring to form a mixed solution, wherein the heating mode is water bath heating, and the heating temperature is 95-100 ℃.
Optionally, epsilon-polylysine is added into the mixed solution, and stirring is carried out for 20-40 min in the step of producing the membrane liquid through reaction.
Optionally, in the step of spreading the film liquid in a film forming device, baking the film to form the composite antibacterial film, the baking is performed in a two-stage baking manner: in the first stage of baking, the baking temperature is 20-40 ℃, and the baking time is 11-13 h; and in the second stage of baking, the baking temperature is 40-50 ℃, and the baking time is 4-6 h.
According to the technical scheme, the natural bacteriostatic agent epsilon-polylysine is added into the raw materials of the antibacterial film as a bacteriostatic component, on one hand, because the epsilon-polylysine does not influence the fragrance and the taste of food and is harmless to human bodies, the prepared antibacterial film can be used as a food packaging film; on the other hand, because the epsilon-polylysine has broad-spectrum bacteriostatic effect and good bacteriostatic effect, the antibacterial film prepared by adding the epsilon-polylysine into the raw materials also has good bacteriostatic effect, and the shelf life of the food can be prolonged. In addition, the interaction of the epsilon-polylysine and the polyvinyl alcohol leads molecules in the film to form a more compact reticular structure, and the bacteriostatic action of the epsilon-polylysine is further enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a method for preparing a composite antibacterial film according to the present invention;
FIG. 2 is a graph showing the change in the total number of colonies in the performance test;
FIG. 3 is a graph showing the variation of TVB-N values in performance tests.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
It should be noted that those whose specific conditions are not specified in the examples were performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Polyvinyl alcohol is a degradable environment-friendly plastic material, is widely applied to various fields such as medicine, agriculture, chemical industry, food and the like, and has attracted more and more attention in recent years. However, the pure polyvinyl alcohol film has no bacteriostatic action, and has limited effect of prolonging the shelf life when being used for fresh-keeping of fresh meat.
In view of the above, the invention provides a composite antibacterial film, which is prepared by using polyvinyl alcohol as a film forming substrate, adding a natural antibacterial agent epsilon-polylysine, using glycerol as a plasticizer and utilizing internalized epsilon-polylysine in polyvinyl alcohol. Specifically, the raw materials of the composite antibacterial film comprise polyvinyl alcohol, glycerol, water and epsilon-polylysine.
The epsilon-polylysine (epsilon-PL) is a natural bacteriostatic agent, has broad-spectrum bacteriostatic effect and good bacteriostatic effect, and after the epsilon-polylysine is added into the raw materials, the epsilon-polylysine reacts with an aqueous solution of polyvinyl alcohol (PVA) to form a net structure, so that an antibacterial film can be well formed under the action of a plasticizer glycerol, and the antibacterial film also has good bacteriostatic effect, can prolong the shelf life of foods, particularly meat foods, and has good fresh-keeping effect. NH contained in epsilon-polylysine3+Can interact with-OH in a free state in polyvinyl alcohol, so that a more compact network structure is formed among molecules in the film, and the bacteriostatic action of epsilon-polylysine is further enhanced. The epsilon-polylysine can not react with the components contained in the food to further influence the flavor and the taste of the food, is natural and nontoxic, has no harm to human bodies, and the antibacterial film prepared by taking the polyvinyl alcohol, the glycerol, the water and the epsilon-polylysine as raw materials can be used as a food packaging film.
In this embodiment, the composite antibacterial film comprises the following raw materials in parts by weight: 100 parts of water, 1-3 parts of polyvinyl alcohol, 0.5-1.5 parts of glycerol and 1-4 parts of epsilon-polylysine. Wherein, the quantization unit of water is volume number, and the quantization unit of other components is weight, for example, every 100mL of water is added with 1-3 g of polyvinyl alcohol, 0.5-1.5 g of glycerol and 1-4 g of epsilon-polylysine.
As a preferred embodiment, the composite antibacterial film can be prepared from the following raw materials in parts by weight: 100 parts of water, 1-3 parts of polyvinyl alcohol, 0.5-1.5 parts of glycerol and 3-4 parts of epsilon-polylysine. The antibacterial film prepared from the raw materials has an obvious antibacterial effect, and compared with a polyvinyl alcohol film without epsilon-polylysine, the shelf life of the antibacterial film can be prolonged by 6-8 days when the antibacterial film is used for preserving fresh duck meat.
The invention also provides a preparation method of the composite antibacterial film, which is used for preparing the composite antibacterial film. Fig. 1 shows an embodiment of a method for preparing a composite antibacterial film according to the present invention.
Referring to fig. 1, the method for preparing the composite antibacterial film includes the following steps:
and step S10, adding polyvinyl alcohol into water, and soaking until the polyvinyl alcohol absorbs water and swells to obtain a swelling body.
In this example, polyvinyl alcohol and water were mixed in the following ratio of g: 1-3 parts by mL: 100, and then soaking until the polyvinyl alcohol fully absorbs water and swells. Specifically, the soaking time is 1-3 h.
And step S20, heating and melting the swelling body, adding glycerol, and uniformly stirring to form a mixed solution.
In specific implementation, the water bath heating mode at 95-100 ℃ can be adopted to heat the water-absorbing swelling polyvinyl alcohol particles until the water-absorbing swelling polyvinyl alcohol particles are completely melted to form a glue solution, wherein the heating time is preferably 30-40 min. And then adding glycerol and stirring for 20-40 min, wherein the weight ratio of the added glycerol to the water is 0.5-1.5: 100.
wherein, the stirring mode has a plurality of modes, and the stirring mode can be mechanical stirring or magnetic stirring.
And step S30, adding epsilon-polylysine into the mixed solution, stirring, and reacting to generate a film forming solution.
Wherein the proportion of the addition amount of the epsilon-polylysine to the weight of the water is 1-4: 100.
when step S30 is implemented, the following steps may be performed: the method comprises the following steps:
and step S31, adding epsilon-polylysine into the mixed solution, stirring for 20-40 min, and standing for 12-24 h to eliminate bubbles to obtain a membrane solution.
And step S40, spreading the film liquid in a film forming device, and drying to form a film, thereby obtaining the composite antibacterial film.
The film forming apparatus may be a 15 × 15cm plastic dish, or a circular disk, a square disk, etc., and the amount of the casting solution is determined by the thickness of the film, for example, 30-50ml of the casting solution may be poured into the 15 × 15cm plastic dish.
The baking film of the embodiment adopts a two-section baking mode: in the first stage of baking, the baking temperature is 20-40 ℃, and the baking time is 11-13 h; and in the second stage of baking, the baking temperature is 40-50 ℃, and the baking time is 4-6 h. In specific implementation, step S40 includes:
and S41, spreading the film liquid in a film forming device, baking for the first time at 20-40 ℃ for 11-13 h, then heating to 40-50 ℃ for baking for the second time for 4-6 h to obtain the composite antibacterial film.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
Example 1
Weighing 3g of polyvinyl alcohol, adding the polyvinyl alcohol into 100mL of distilled water, soaking for 1.7h, then placing the polyvinyl alcohol particles which are swelled by water absorption into a boiling water bath, heating for 30min until the polyvinyl alcohol particles are completely melted, adding 0.5g of glycerol, magnetically stirring for 20min, adding 1g of epsilon-polylysine, magnetically stirring for 20min, placing into an ultrasonic instrument, and defoaming for 40min to obtain a membrane liquid. And spreading the film liquid in a film forming device, baking for 11h at the temperature of 30 ℃, then heating to 50 ℃, baking for 4h, and uncovering the film to obtain the polyvinyl alcohol/epsilon-polylysine composite antibacterial film.
Example 2
Weighing 1g of polyvinyl alcohol, adding the polyvinyl alcohol into 100mL of distilled water, soaking for 2h, then placing the polyvinyl alcohol particles which are swelled by water absorption into a boiling water bath, heating for 35min until the polyvinyl alcohol particles are completely melted, adding 1g of glycerol, magnetically stirring for 40min, adding 2g of epsilon-polylysine, magnetically stirring for 40min, and placing the mixture into an ultrasonic instrument for defoaming for 33min to obtain the casting solution. And spreading the film liquid in a film forming device, baking for 13 hours at the temperature of 20 ℃, then heating to 40 ℃, baking for 4.2 hours, and uncovering the film to obtain the polyvinyl alcohol/epsilon-polylysine composite antibacterial film.
Example 3
Weighing 2.6g of polyvinyl alcohol, adding the polyvinyl alcohol into 100mL of distilled water, soaking for 1h, then placing the polyvinyl alcohol particles which absorb water and swell in a boiling water bath, heating for 40min until the polyvinyl alcohol particles are completely melted, adding 1.2g of glycerol, magnetically stirring for 35min, adding 3g of epsilon-polylysine, magnetically stirring for 35min, placing in an ultrasonic instrument, and soaking for 30min to obtain a casting solution. And spreading the film liquid in a film forming device, baking for 12.5 hours at 40 ℃, then heating to 42 ℃, baking for 6 hours, and uncovering the film to obtain the polyvinyl alcohol/epsilon-polylysine composite antibacterial film.
Example 4
Weighing 2.5g of polyvinyl alcohol, adding the polyvinyl alcohol into 100mL of distilled water, soaking for 3h, then placing the polyvinyl alcohol particles which are swelled by water absorption into a boiling water bath, heating for 36min until the polyvinyl alcohol particles are completely melted, adding 1.5g of glycerol, magnetically stirring for 30min, adding 4g of epsilon-polylysine, magnetically stirring for 30min, placing into an ultrasonic instrument, and soaking for 20min to obtain the casting solution. And spreading the film liquid in a film forming device, baking for 12 hours at the temperature of 35 ℃, then heating to 45 ℃, baking for 5 hours, and uncovering the film to obtain the polyvinyl alcohol/epsilon-polylysine composite antibacterial film.
And (3) performance testing: peeling fresh duck meat purchased in supermarket, cutting into pieces 40-60g each, and placing in sterile tray. The sterilized trays were wrapped with the antibacterial films prepared in examples 1 to 4 to serve as experimental groups; the composite antibacterial film is not used for wrapping as a blank group; the sterile trays were wrapped with an antibacterial film without epsilon-polylysine added to serve as a control group. Then, the samples were placed in a storage environment at 10 ℃ and sampled at 0, 2, 4, 6 and 8 days to determine the total number of colonies and the TVB-N value (volatile basic nitrogen), respectively, and the results are shown in FIGS. 2 and 3. The preparation method of the control group antibacterial membrane comprises the following steps: the procedure was as in example 1 except that epsilon-polylysine was not added.
The total number of colonies and the TVB-N value refer to GB 16869-2005 fresh frozen poultry products, and concretely, the total number of colonies does not exceed 1 × 106CFU/g, TVB-N value is not more than 15mg/100 g.
And (4) analyzing results: (1) as can be seen from FIG. 2, the total number of colonies in the duck meat is 3.85lg CFU/g at 0d, and the total number of colonies in the blank group reaches 5.89lg CFU/g at 4d along with the extension of the storage time, so that the duck meat becomes deteriorated meat; at the 4d of the control group, the total number of colonies reaches 5.89lg CFU/g, and the deteriorated meat is basically formed; the experimental groups 1 and 2 exceeded 6lg CFU/g at 6d and met the spoiled meat standard, and the experimental groups 3 and 4 met the spoiled meat standard at 8 d.
(2) As can be seen from FIG. 3, the TVB-N value at 0d was 4.2mg/100g, and as the storage time increased, the TVB-N reached 15.4mg/100g at 4d, exceeding the deteriorated meat standard of 15mg/100g in the blank group; when the pure polyvinyl alcohol film control group is at the 4 th day, the TVB-N reaches 15.4mg/100g and exceeds the deteriorated meat standard of 15mg/100 g; the test group 1 exceeded the deteriorated meat standard of 15mg/100g at 6d, the test groups 2 and 3 exceeded the deteriorated meat standard of 15mg/100g at 8d, and the test group 4 had a TVB-N of 12.6mg/100g at 8d, which still did not meet the deteriorated meat standard.
As described above, the changes in the total number of colonies and TVB-N in the experimental groups of each example were significantly suppressed compared to the blank group and the control group. Compared with the duck meat preserved by pure polyvinyl alcohol, the shelf life of the duck meat preserved by the composite antibacterial films of the embodiments is prolonged.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (7)
1. The composite antibacterial film is characterized in that raw materials of the composite antibacterial film comprise polyvinyl alcohol, glycerol, water and epsilon-polylysine.
2. The composite antibacterial film of claim 1, wherein the composite antibacterial film comprises the following raw materials in parts by weight: 100 parts of water, 1-3 parts of polyvinyl alcohol, 0.5-1.5 parts of glycerol and 1-4 parts of epsilon-polylysine.
3. The composite antibacterial film according to claim 2, wherein the composite antibacterial film is prepared from the following raw materials in parts by weight: 100 parts of water, 1-3 parts of polyvinyl alcohol, 0.5-1.5 parts of glycerol and 3-4 parts of epsilon-polylysine.
4. A method for preparing a composite antibacterial film according to any one of claims 1 to 3, comprising the steps of:
adding polyvinyl alcohol into water, and soaking until the polyvinyl alcohol absorbs water and swells to obtain a swelling body;
heating and melting the swelling body, adding glycerol, and uniformly stirring to form a mixed solution;
adding epsilon-polylysine into the mixed solution, stirring, and reacting to generate a film forming solution;
and spreading the film liquid in a film forming device, and drying to form a film to obtain the composite antibacterial film.
5. The method for preparing a composite antibacterial film according to claim 4, wherein the swelling body is heated to melt, then glycerin is added, and the mixture is stirred and mixed uniformly to form a mixed solution, wherein the heating mode is water bath heating, and the heating temperature is 95-100 ℃.
6. The method for preparing a composite antibacterial film according to claim 4, wherein epsilon-polylysine is added into the mixed solution, and the stirring is carried out for 20-40 min in the step of producing the film-forming solution through reaction.
7. The method for preparing a composite antibacterial film according to claim 4, wherein in the step of spreading the film liquid in a film forming device and baking the film to form the composite antibacterial film, the baking adopts a two-stage baking mode: in the first stage of baking, the baking temperature is 20-40 ℃, and the baking time is 11-13 h; and in the second stage of baking, the baking temperature is 40-50 ℃, and the baking time is 4-6 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112848439A (en) * | 2021-01-04 | 2021-05-28 | 许胜强 | Production process of antibacterial medical gloves |
| CN113462107A (en) * | 2021-07-07 | 2021-10-01 | 天津天狮学院 | Biological antibacterial fresh-keeping packaging film for fresh agricultural products and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102492162A (en) * | 2011-11-15 | 2012-06-13 | 天津科技大学 | Epsilon-polylysine and polyvinyl alcohol composite biological antibacterial film and its preparation method |
| US20170252300A1 (en) * | 2016-03-03 | 2017-09-07 | Pankaj Modi | Orally administrable composition |
| CN109400968A (en) * | 2017-08-15 | 2019-03-01 | 天津科技大学 | A kind of edible polysaccharide antimicrobial compound film and preparation method thereof |
-
2019
- 2019-12-30 CN CN201911402580.6A patent/CN111117125A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102492162A (en) * | 2011-11-15 | 2012-06-13 | 天津科技大学 | Epsilon-polylysine and polyvinyl alcohol composite biological antibacterial film and its preparation method |
| US20170252300A1 (en) * | 2016-03-03 | 2017-09-07 | Pankaj Modi | Orally administrable composition |
| CN109400968A (en) * | 2017-08-15 | 2019-03-01 | 天津科技大学 | A kind of edible polysaccharide antimicrobial compound film and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112848439A (en) * | 2021-01-04 | 2021-05-28 | 许胜强 | Production process of antibacterial medical gloves |
| CN113462107A (en) * | 2021-07-07 | 2021-10-01 | 天津天狮学院 | Biological antibacterial fresh-keeping packaging film for fresh agricultural products and preparation method thereof |
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