Grafted antibacterial degradable fresh-keeping film, and preparation method and application thereof

A technology of film and branch type, which is applied in the field of grafted antibacterial and degradable fresh-keeping film and its preparation, and can solve problems such as food poisoning

Inactive Publication Date: 2020-02-04
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Some strains of Bacillus cereus are pathogenic and can cause food poisoning

Method used

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  • Grafted antibacterial degradable fresh-keeping film, and preparation method and application thereof
  • Grafted antibacterial degradable fresh-keeping film, and preparation method and application thereof
  • Grafted antibacterial degradable fresh-keeping film, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] PLA (2003D; Nature Works, USA), PHA (H2000; Samsung, South Korea) and PBS (1020MD; Japan Showa Denko Co., Ltd.) were thoroughly mixed according to the mass ratio of 4:3:3 and then extruded through twin-screws. The equipment is blended and extruded, cooled in a water tank, and cut to obtain composite masterbatches of uniform size. After drying in a blast drying oven at 60°C for 2 hours, the resin particles are cast into a film through a plastic extrusion device and a casting machine to obtain the described film. Among them, the temperatures in zone 1-7 of the twin-screw extrusion device are: 140°C, 160°C, 170°C, 175°C, 170°C, 170°C, 170°C, the screw speed is 50r / min, and the film thickness is controlled to be 45μm. The film is designated Film A.

Embodiment 2

[0048] Film surface modification: The film A was ultrasonically cleaned with propanol, ethanol, and deionized water for 10 minutes, and then placed in a constant temperature blast drying oven at 35°C for 12 hours, and then the dried film was surfaced by a plasma processor at a constant speed. Modification, the power of the plasma processor is 30W, 60W, 90W, 120W, and the plasma speed is controlled at 8cm 2 / s. Depend on image 3 It can be seen that the amount of carboxyl groups on the surface of the film treated with 60W power is the highest, which is 28.6nmol COOH / cm 2 Afterwards, the films were all treated with a plasma power of 60W, and the film treated with a 60W plasma power was designated as film B, and the conjugated solution was prepared immediately.

[0049] Conjugate solution preparation: 5 x 10 -2 mol 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and 1×10 -2 mol N-hydroxysuccinimide (NHS) was reacted in 1L 0.1mol / L buffer solution morpholineet...

Embodiment 3

[0052] Put film C into a beaker containing 1L nisin solution with a concentration of 5mg / mL, then place the beaker on a magnetic stirrer heated to 60°C and stir for 2h, and rinse the film with 1L deionized water after completion , then ultrasonically cleaned with deionized water for 10 minutes, and finally dried with clean air for 24 hours. Obtain the graft type antibacterial and degradable fresh-keeping film, which is denoted as food packaging film D. Nisin was purchased from Sinopharm Chemical Reagent Co., Ltd. Weigh 5g of nisin, dissolve it in 1L of distilled water at room temperature, stir to dissolve, and obtain a 5mg / L bacteriocin solution. The volume ratio of the single surface area of ​​the film to the conjugated solution is 10cm 2 / mL, the volume ratio of the single surface area of ​​the film to the nisin solution is 10cm 2 / mL.

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Abstract

The invention provides a grafted antibacterial degradable fresh-keeping film, and a preparation method and an application thereof. One or more of degradable materials which are polylactic acid (PLA),butenesuccinic acid (PBS) and polyhydroxyalkanoate (PHA) are used as a base film of a packaging material, the base film is subjected to surface modification by adopting plasma treatment to make activegroups such as a carboxyl group generated on the surface, bacteriocin is connected to the surface of the plasma-treated film through an EDC-NHS coupling technology, and an amino group on an active antibacterial agent and the carboxyl group, generated on the film subjected to plasma and coupling agent treatment, are stably combined in a mode of forming an amido bond. The grafted antibacterial degradable fresh-keeping film has a hydrophilic antibacterial activity, is an environmentally-friendly, safe and reliable novel antibacterial packaging material, and can be applied to food preservation.

Description

technical field [0001] The invention belongs to the technical field of fresh-keeping film materials, and in particular relates to a grafted antibacterial and degradable fresh-keeping film and its preparation method and application. Background technique [0002] According to a report released by the Organization for Economic Co-operation and Development (OECD), since 2015, the global plastic waste generation has continued to increase, with more than 300 million tons flowing into the environment every year, and it is predicted that it will reach about 12 billion tons by 2050. Europe, Asia and other regions are implementing increasingly strict "ban on plastics" to curb the spread of plastic waste. Bio-based materials known as "green, environmentally friendly, renewable, and easily degradable" are particularly important, ushering in a golden period of development. Biodegradable plastics refer to plastics that are degraded under the action of microorganisms in nature. They are i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/18C08L67/04C08L67/02B65D65/46
CPCC08J7/12C08J7/123C08J5/18B65D65/466C08J2367/04C08J2467/02Y02W90/10Y02A40/90
Inventor 李立黄泳斐唐海兵陈静雯李洋洋宋文龙
Owner SHANGHAI OCEAN UNIV
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