Composite algal polysaccharide-based double-layer packaging film as well as preparation method and application thereof

A technology of seaweed polysaccharide and packaging film, which is applied in the direction of biological packaging, transportation and packaging, sustainable packaging, etc., can solve the problems of reducing the release/volatility rate of essential oils, and achieve obvious inner and outer layer structure, good sealing performance, and good antibacterial effect of effect

Active Publication Date: 2020-07-24
SHANTOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to reduce the release / volatility rate of essential oils in the film, the blending of different polysaccharide raw materials is currently used for film preparation; however, there is still room for improvement in the barrier properties of films produced in this way, and other issues such as mechanical properties waiting to be improved place

Method used

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  • Composite algal polysaccharide-based double-layer packaging film as well as preparation method and application thereof
  • Composite algal polysaccharide-based double-layer packaging film as well as preparation method and application thereof
  • Composite algal polysaccharide-based double-layer packaging film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of sodium alginate-agar-ginger essential oil composite double-layer antibacterial film

[0038] Process flow chart such as figure 1 As shown, it mainly includes the following steps:

[0039](1) Preparation of agar: select fresh, impurity-free asparagus, dry it, grind it into powder and pass through an 80-mesh sieve, take the powder and add absolute ethanol at a ratio of 1:10 (w / v) to soak overnight, remove the ethanol and dry it. After natural air-drying, extract by hot water reflux method (material-to-liquid ratio 1:60, water temperature 100°C, extraction time 120min, repeat extraction twice); the extract was frozen at -50°C for 12 hours, then redissolved at room temperature, centrifuged (4000rpm, 15 min) to remove the jelly in the lower layer; quickly freeze the jelly at -50°C for 24 hours, and then vacuum freeze-dry to obtain agar;

[0040] (2) Preparation of compound seaweed polysaccharide film-forming solution: weigh a certain quality of ra...

Embodiment 2

[0045] Example 2: Structural characterization and determination of sodium alginate-agar-ginger essential oil composite double-layer antibacterial film

[0046] The sodium alginate-agar-ginger essential oil composite double-layer antibacterial film (a kind of composite seaweed polysaccharide-based double-layer packaging film) prepared in Example 1 is placed in a temperature of 25 ° C and a relative humidity of 50%. Set 48h.

[0047] (1) Scanning electron microscope detection: Take the sodium alginate-agar-ginger essential oil composite double-layer antibacterial film sample that has been balanced, stick it on the conductive adhesive and install it on the sample holder; the cross-section of the film sample is passed through the film in liquid nitrogen Brittle fractures were obtained, which were also pasted on the conductive adhesive and mounted on the sample holder. Spray gold for 15 minutes in a vacuum environment with a sputter coater. Then its surface and cross-sectional mi...

Embodiment 3

[0056] Example 3: Detection of antibacterial properties of sodium alginate-agar-ginger essential oil composite double-layer antibacterial film

[0057] Bacteriostatic activity assay index evaluation: according to "GB 4789.2-2016" to evaluate the growth of antibacterial film on foodborne pathogenic Gram-positive bacteria (Staphylococcus aureus, Bacillus subtilis) and Gram-negative bacteria (Escherichia coli) Inhibitory effect:

[0058] (1) Strain activation: thaw the medium of Escherichia coli, Staphylococcus aureus, and Bacillus subtilis fused and stored in BHI broth, transfer the medium (0.1mL) to 10mL of BHI broth, and store at 37°C Cultivate in shake flask incubator for 24h;

[0059] (2) Determination of bacterial liquid concentration: the bacterial liquid concentration was determined by the plate dilution method, and the above culture (0.1 mL) was transferred to 10 mL of BHI broth for the second time, and cultured at 37 ° C for 24 h until the end of the growth index stage...

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Abstract

The invention discloses a composite algal polysaccharide-based double-layer packaging film as well as a preparation method and application thereof. The preparation process mainly comprises the following steps: firstly, dissolving agar, sodium alginate and glycerol in water to form a film forming solution, preparing a film forming emulsion from a part of the film forming solution, essential oil andTween 80, and preparing a crosslinking solution from a part of the film forming solution and a calcium chloride solution; and drying the film-forming emulsion at low temperature to obtain an inner-layer film, paving the crosslinking solution on the surface of the dried inner-layer film, and drying at low temperature again to obtain the double-layer antibacterial film. The preparation method is simple and low in cost, and raw materials are easy to obtain; the prepared sodium alginate-agar-ginger essential oil composite antibacterial film is mainly formed through non-covalent bond physical crosslinking, a film matrix has an obvious porous structure, and a compact and continuous outer layer film can effectively slow down volatilization and release of essential oil, so that the preservative and fresh-keeping effects of the antibacterial film are better improved.

Description

technical field [0001] The invention belongs to the technical field of food packaging and preservation, and in particular relates to a composite seaweed polysaccharide-based double-layer packaging film and its preparation method and application. Background technique [0002] At present, the global plastic consumption exceeds 200 million tons, with an annual growth rate of about 5%. It is one of the fields with the largest application of crude oil; these petrochemical-based plastics have good mechanical properties, barrier properties, heat sealing properties, etc., and are often used as packaging Materials such as polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), etc. However, since petrochemical-based plastic packaging materials are not fully recyclable and are almost or completely non-biodegradable, they pose serious environmental and ecological problems. Therefore, consumers and markets in various countrie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J5/18C08J3/24C08L5/12C08L5/04C08L91/00C08K3/16B65D81/24C08B37/12
CPCC08J5/18C08J3/246B65D81/24C08B37/0039C08J2305/12C08J2405/04C08J2405/12C08J2491/00C08K2003/162Y02W90/10Y02A40/90
Inventor 刘杨章斌王欢欢滕博张杰良钟名其伦镜盛
Owner SHANTOU UNIV
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