Starch/polylactic acid antibacterial activity packaging material as well as preparation method and application thereof

An antibacterial activity, packaging material technology, applied in packaging, wrapping paper, transportation and packaging, etc., to achieve both antibacterial timeliness and long-term effects

Active Publication Date: 2012-10-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The research work on the preparation of food antibacterial active packaging materials with antibacterial activity and controlled release function with both antibacterial timeliness and long-term effect using starch / polylactic acid blend materials as the base material has not been reported at home and abroad.

Method used

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  • Starch/polylactic acid antibacterial activity packaging material as well as preparation method and application thereof
  • Starch/polylactic acid antibacterial activity packaging material as well as preparation method and application thereof
  • Starch/polylactic acid antibacterial activity packaging material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Polylactic acid (REVODE101, Zhejiang Hisun Biomaterials Co., Ltd.): 60kg

[0039] Corn starch (food grade, Huanglong Food Industry Co., Ltd.): 30kg, dried to a moisture content of 0.5%

[0040] Diphenylmethane-4,4-diisoate (chemically pure, Xiamen Lufa Trade Development Co., Ltd.): 0.01kg

[0041] Chitosan (food grade, deacetylation degree 90%, Jinan Haidebei Marine Biological Engineering Co., Ltd.): 9.99kg.

[0042] The preparation method is as follows:

[0043] (1) starch plasticization

[0044] Dry the starch until the moisture content is 0.5%, add 1-2% glycerin (glycerin / starch, w / w), mix evenly, feed from the first feeding port of the twin-screw extruder, and convey through the screw conveying section, Pre-plasticized under the condition of external heating of the screw, the pre-plasticized temperature is 140°C, the pre-plasticized starch is further plasticized under the action of the kneading screw block, the plasticized temperature is 170°C, the outer diameter...

Embodiment 2

[0057] Each component in the blended material is adjusted to:

[0058] Polylactic acid (REVODE101, Zhejiang Hisun Biomaterials Co., Ltd.): 45kg

[0059] Potato starch (food grade, Qinghai Sanjiang Group Co., Ltd.): 44kg, dried to a moisture content of 1.0%

[0060] Diphenylmethane-4,4-diisoate (chemically pure, Xiamen Lufa Trade Development Co., Ltd.): 1kg Nisin (food grade, Xiamen Abio Biotechnology Co., Ltd.): 10kg.

[0061] The preparation method is the same as in Example 1.

[0062] (1) The prepared antibacterial material was used for the packaging of fresh pork (Guangzhou China Resources Wanjia Supermarket, the same below), stored at 4°C for one week, according to the national standard GB / T4789.17-2003 "Food Hygiene Microbiology The method specified in "Inspection of Meat and Meat Products Inspection" tests the number of Escherichia coli and Staphylococcus aureus, and the results are shown in Table 2.

[0063] (2) The prepared antibacterial material was used for the pa...

Embodiment 3

[0067] Each component in the blended material is adjusted to:

[0068] Polylactic acid (REVODE101, Zhejiang Hisun Biomaterials Co., Ltd.): 60kg

[0069] High-chain starch (Hylon V, food grade, American National Starch Company): 35kg, dried to a moisture content of 0.5%

[0070] Diphenylmethane-4,4-diisoate (chemically pure, Xiamen Lufa Trade Development Co., Ltd.): 0.05kg

[0071] Lysozyme (lysozyme, food grade, Jinan Xuyunchuang Biotechnology Co., Ltd.): 4.95kg.

[0072] The preparation method is the same as in Example 1.

[0073] The mechanical properties, thermal properties and barrier properties of the prepared antibacterial active packaging materials were tested, and the results are shown in Table 2. The material is used for the packaging of fresh pork, fresh chicken and homemade ham sausage (without preservatives), the total number of colonies and the number of Escherichia coli and Staphylococcus aureus in the food are tested before packaging, and they are stored at 4...

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Abstract

The invention discloses a starch / polylactic acid blending antibacterial activity packaging material with the antibacterial activity control release function, as well as a preparation method and application thereof. The proper hydrophilic and hydrophobic property of the starch / polylactic acid blending material is utilized to regulate the migration dissolution rate of an antibacterial agent, and therefore, the antibacterial material combines the antibacterial timeliness and the antibacterial long effectiveness and prolongs the food shelf life. The antibacterial packaging material comprises the following compositions in percentage by weight: 30-40 percent of starch, 2-10 percent of antibacterial agent, 45-60 percent of polylactic acid and 0.01-1 percent of compatibilizer. The compositions are sequentially added into a twin-screw extruder from different feeding holes, the blended materials are treated by plasticization, kneading and reaction blending to prepare the starch / polylactic acid blending antibacterial activity packaging material. On the one hand, the material fulfills the function of antibacterial activity control release and combines the antibacterial timeliness and the antibacterial long effectiveness, and on the other hand, the material has the advantages of excellent mechanical property and wider application range and can be used for high water activity food corrosionand bacteria prevention.

Description

technical field [0001] The invention relates to the field of food active packaging materials, in particular to a starch / polylactic acid antibacterial active packaging with antibacterial activity controlled release function, complete biodegradation, which can be used for high water activity foods and has antibacterial timeliness and long-term effect materials, and related to the preparation methods and applications of the materials. Background technique [0002] Antibacterial active packaging is a new packaging concept proposed in the 1990s. It is to add antibacterial agents to polymer packaging materials to generate antibacterial activity through antibacterial agents to reduce or replace the method of directly adding antiseptic substances to food. Maintain a stable concentration of antibacterial agents inside the package to achieve the purpose of antibacterial and antiseptic, so that the food can be preserved for a long time. Antibacterial active packaging materials have in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L3/02B29C47/92B65D65/46B29C48/92
CPCB29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 李晓玺陈玲刘佳刘鹏李琳苏健裕
Owner SOUTH CHINA UNIV OF TECH
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