CN111995800A - Preparation method of cellulose-based antibacterial food packaging film - Google Patents
Preparation method of cellulose-based antibacterial food packaging film Download PDFInfo
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- CN111995800A CN111995800A CN202010914664.4A CN202010914664A CN111995800A CN 111995800 A CN111995800 A CN 111995800A CN 202010914664 A CN202010914664 A CN 202010914664A CN 111995800 A CN111995800 A CN 111995800A
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- cellulose
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- food packaging
- based antibacterial
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/20—Post-etherification treatments of chemical or physical type, e.g. mixed etherification in two steps, including purification
-
- 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
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/26—Cellulose ethers
- C08J2301/28—Alkyl ethers
-
- 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
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
-
- 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
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention provides a preparation method of a cellulose-based antibacterial food packaging film, which comprises the steps of grafting antibacterial substance tea polyphenol to modified cellulose, then adding chitosan, starch and glycerol to obtain a forming slurry, and finally performing tape casting to form a film to obtain the cellulose-based antibacterial food packaging film material. The packaging film has good tensile property and excellent antibacterial property, is beneficial to storage of food and has potential application value.
Description
Technical Field
The invention belongs to the technical field of packaging film material preparation, and particularly relates to a preparation method of a cellulose-based antibacterial food packaging film.
Background
The current plastic film material is widely applied to packaging and fresh-keeping due to low price and stable property. However, these plastic packaging films are difficult to degrade and easily cause "white pollution" after being discarded, which poses a serious threat to the environment. Wherein, the degradable packaging film prepared by taking the biodegradable material as the base material replaces a non-degradable or non-degradable plastic preservative film, and has important significance for building an environment-friendly society.
The biomass material has wide application prospect in the field of food due to the nature, safety and degradability of the biomass material and the fact that people pursue green and healthy concepts. Cellulose is most promising among natural polymers, cheap, abundant, renewable and biodegradable and biopolymer, making it the most important biopolymer for degradable films, but cellulose is sensitive to humidity and low mechanical. It is generally modified as degradable packaging material by various methods of biological polymerization (such as grafting, blending), nanotechnology and ionizing radiation. Meanwhile, because tea polyphenol is a phenolic compound extracted from tea leaves, the tea polyphenol is widely used in food because of natural safety and good antibacterial and antioxidant activity. Therefore, the research of developing the antibacterial and degradable composite packaging material which takes the natural biomass as the green raw material and is compounded with the natural antibacterial material tea polyphenol is very important.
Disclosure of Invention
The invention provides a preparation method of a cellulose-based antibacterial food packaging film, aiming at solving the problem that the existing packaging film is easy to cause environmental pollution. The packaging film is prepared from green biomass cellulose serving as a raw material through grafting modification of an antibacterial substance and blending of degradable material starch and chitosan, has good tensile property and antibacterial property, is beneficial to food preservation, and has potential application value.
The invention is realized by the following technical scheme:
a preparation method of a cellulose-based antibacterial degradable packaging film comprises the following steps:
(1) preparation of tea polyphenol grafted cellulose complex (TP/CMC)
Dissolving carboxymethyl cellulose in an acetic acid solution, and stirring and dissolving at room temperature; and then weighing tea polyphenol, dissolving in water, quickly adding into the solution, mechanically stirring at 80-90 ℃ for reaction for 10-12 h, and cooling to room temperature to obtain a tea polyphenol grafted cellulose (TP/CMC) solution.
The specific preparation route is as follows:
the mass ratio of the carboxymethyl cellulose to the tea polyphenol is 1 g: 1.4-2.8 g, wherein the mass fraction of the acetic acid solution is 2% -5%.
(2) Preparation of cellulose-based antibacterial food packaging film
Adding carboxylated chitosan, starch and glycerol into the tea polyphenol grafted cellulose compound (TP/CMC) solution obtained in the step (1), stirring and blending for 1-2 h, degassing and standing to obtain a molding slurry; and then carrying out tape casting, drying and film uncovering on the slurry to obtain the cellulose-based antibacterial food packaging film.
The mass ratio of the chitosan, the starch, the glycerol and the tea polyphenol grafted cellulose compound (TP/CMC) is (3-8) g: (5-7) g: 1 g: (5-10) g.
The vacuum degree in the degassing process is not lower than-0.090 MPa.
The casting process comprises the following steps: and pouring the formed slurry onto a 20cm × 20cm dry and clean glass dish for casting to form a film, wherein the thickness of the slurry is controlled to be 0.1-0.2 cm.
The drying temperature is 40-60 ℃, and the drying time is 6-8 hours.
Compared with the prior art, the invention has the beneficial effects that:
1. the natural biomass cellulose is used as a substrate, and the tea polyphenol is introduced into the membrane material through graft modification, so that the membrane material has the advantages of simple and convenient operation, excellent antibacterial property, biodegradability, environmental protection and good development prospect in the aspect of food packaging.
2. The preparation method is simple, does not need any harmful reagent, and is easy for large-scale production and application.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following embodiments:
example 1:
a preparation method of a cellulose-based antibacterial food packaging film comprises the following steps:
(1) preparation of tea polyphenol grafted Shell cellulose Complex (TP/CMC)
Dissolving 5g of carboxymethyl cellulose in 2% 100mL of acetic acid solution, and stirring at room temperature to dissolve; weighing 10g of tea polyphenol, dissolving in water, quickly adding into the solution, mechanically stirring at 80 ℃ for reaction for 10h, and cooling to room temperature to obtain the tea polyphenol grafted cellulose solution.
(2) Preparation of cellulose-based antibacterial food packaging film
Adding 5g of chitosan, 5g of starch and 1g of glycerol into the tea polyphenol grafted chitosan solution obtained in the step (1), stirring and blending for 2 hours, degassing at-0.090 MPa, and standing for 4 hours to obtain a molding slurry; and pouring the formed slurry onto a 20 cm-by-20 cm dry and clean glass dish for casting to form a film, wherein the thickness of the slurry is controlled to be 0.1 cm. Drying at 60 ℃ for 6h, and uncovering the film to obtain the antibacterial degradable food packaging film.
Example 2:
a preparation method of a cellulose-based antibacterial food packaging film comprises the following steps:
(1) preparation of tea polyphenol grafted cellulose complex (TP/CMC)
Dissolving 5g of carboxymethyl cellulose in 2% 100mL of acetic acid solution, and stirring at room temperature to dissolve; weighing 10g of tea polyphenol, dissolving in water, quickly adding into the solution, mechanically stirring at 80 ℃ for reaction for 10h, and cooling to room temperature to obtain the tea polyphenol grafted cellulose solution.
(2) Preparation of cellulose-based antibacterial food packaging film
Adding 8g of chitosan, 5g of starch and 1g of glycerol into the tea polyphenol grafted chitosan solution obtained in the step (1), stirring and blending for 2 hours, degassing at-0.090 MPa, and standing for 4 hours to obtain a molding slurry; and pouring the formed slurry onto a 20 cm-by-20 cm dry and clean glass dish for casting to form a film, wherein the thickness of the slurry is controlled to be 0.1 cm. Drying at 60 ℃ for 6h, and uncovering the film to obtain the antibacterial degradable food packaging film.
Example 3:
(1) preparation of tea polyphenol grafted cellulose complex (TP/CMC)
Dissolving 5g of carboxymethyl cellulose in 2% 100mL of acetic acid solution, and stirring at room temperature to dissolve; weighing 10g of tea polyphenol, dissolving in water, quickly adding into the solution, mechanically stirring at 80 ℃ for reaction for 10h, and cooling to room temperature to obtain the tea polyphenol grafted cellulose solution.
(2) Preparation of cellulose-based antibacterial food packaging film
Adding 8g of chitosan, 8g of starch and 1g of glycerol into the tea polyphenol grafted chitosan solution obtained in the step (1), stirring and blending for 2 hours, degassing at-0.090 MPa, and standing for 4 hours to obtain a molding slurry; and pouring the formed slurry onto a 20 cm-by-20 cm dry and clean glass dish for casting to form a film, wherein the thickness of the slurry is controlled to be 0.1 cm. Drying at 60 ℃ for 6h, and uncovering the film to obtain the antibacterial degradable food packaging film.
Test example 1:
and testing the tensile property of the cellulose-based antibacterial food packaging film.
Test samples: the cellulose-based antibacterial food packaging films prepared in the step (2) of examples 1 to 3 were tested for elongation at break using the cellulose-based antibacterial food packaging films prepared in the step (2) of examples 1, 2 and 3, and the specific test results are shown in table 1.
Table 1 elongation at break test data table
Comparing the elongation at break of the cellulose-based antibacterial food packaging films prepared in examples 1 to 3, the result shows that the elongation at break of the cellulose-based antibacterial food packaging film prepared in example 3 is higher, and the increase of the proportion of the chitosan and the starch contents can enhance the tensile property of the packaging film.
Test example 2:
and (3) testing the antibacterial performance of the cellulose-based antibacterial food packaging film.
Test samples: cellulose-based antibacterial food packaging films prepared in step (2) of examples 1-3. The cellulose-based antibacterial food packaging films prepared in examples 1-3 were tested for antibacterial performance, and tested according to GB/T21510-2008 for detection of Escherichia coli ATYCC25922 and Staphylococcus aureus ATCC 6538. The specific test results are shown in table 2.
TABLE 2 antibacterial Property test data sheet
| Sample (I) | The bactericidal activity of Escherichia coli/%) | Staphylococcus aureus bactericidal rate/%) |
| Example 1 | 97.8 | 96.4 |
| Example 2 | 97.7 | 96.8 |
| Example 3 | 96.8 | 96.7 |
As seen from the data in Table 2, the cellulose-based antibacterial food packaging films prepared in examples 1 to 3 have excellent antibacterial properties; the overall result shows that the cellulose-based antibacterial food packaging film obtained by the preparation method has excellent antibacterial performance, and the highest sterilization rate to escherichia coli can reach 97.8%; the highest sterilization rate to staphylococcus aureus can reach 96.8%.
Claims (7)
1. The preparation method of the cellulose-based antibacterial food packaging film is characterized by comprising the following steps:
(1) preparation of tea polyphenol grafted cellulose complex (TP/CMC)
Dissolving carboxymethyl cellulose in an acetic acid solution, and stirring and dissolving at room temperature; then weighing tea polyphenol, dissolving in water, quickly adding into the solution, mechanically stirring at 80-90 ℃ for reaction for 10-12 h, and cooling to room temperature to obtain a tea polyphenol grafted cellulose compound solution;
(2) preparation of cellulose-based antibacterial food packaging film
Adding carboxylated chitosan, starch and glycerol into the tea polyphenol grafted cellulose compound solution obtained in the step (1), stirring and blending for 1-2 h, degassing and standing to obtain a formed slurry; and then carrying out tape casting, drying and film uncovering on the slurry to obtain the cellulose-based antibacterial food packaging film.
2. The method for preparing a cellulose-based antibacterial food packaging film according to claim 1, wherein the mass ratio of the carboxymethyl cellulose to the tea polyphenol in step (1) is 1 g: 1.4-2.8 g.
3. The method for preparing a cellulose-based antibacterial food packaging film according to claim 1, wherein the mass fraction of the acetic acid solution in step (1) is 2% to 5%.
4. The preparation method of the cellulose-based antibacterial food packaging film according to claim 1, wherein the mass ratio of the chitosan, the starch, the glycerol and the tea polyphenol grafted cellulose compound in the step (1) is (3-8) g: (5-7) g: 1 g: (5-10) g.
5. The method for preparing a cellulose-based antibacterial food packaging film according to claim 1, wherein the degree of vacuum during the degassing in step (2) is not lower than-0.090 MPa.
6. The method for preparing a cellulose-based antibacterial food packaging film according to claim 1, wherein the casting process in the step (2) is: and pouring the formed slurry onto a 20cm × 20cm dry and clean glass dish for casting to form a film, wherein the thickness of the slurry is controlled to be 0.1-0.2 cm.
7. The method for preparing a cellulose-based antibacterial food packaging film according to claim 1, wherein the drying temperature in the step (3) is 40-60 ℃ and the drying time is 6-8 h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112795042A (en) * | 2021-01-29 | 2021-05-14 | 赵春富 | Preparation method of corn straw cellulose antibacterial film |
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