Catechin graft modified starch, degradable preservative film and preparation method thereof

A technology of grafting modification and catechin, which is applied in sustainable manufacturing/processing, flexible coverings, transportation and packaging, etc., can solve the problems of limited research on phenolic compound grafted starch, and achieve high-efficiency broad-spectrum antibacterial Antioxidant properties, avoiding the decline of antimicrobial agent concentration, eliminating the effect of potential harm

Active Publication Date: 2020-03-17
蚌埠天成包装科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, research on grafted starches with phenolic compounds is very limited

Method used

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  • Catechin graft modified starch, degradable preservative film and preparation method thereof
  • Catechin graft modified starch, degradable preservative film and preparation method thereof
  • Catechin graft modified starch, degradable preservative film and preparation method thereof

Examples

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Embodiment 1

[0028] A preparation method of catechin grafted modified starch, the specific implementation steps are as follows:

[0029] (1) In a 2L three-necked round-bottom flask, dissolve 6g of starch in 600ml of 1% acetic acid solution, then add 1.08g of ascorbic acid and 5.31g of catechin into the flask, and slowly pass in oxygen-free nitrogen while stirring After flowing for 40 minutes, add 15ml of 1mol / L H 2 o 2 solution to initiate the reaction, and reacted at 25°C for 18h in a nitrogen atmosphere;

[0030] (2) After the reaction, the reaction mixture was added to a cut-off membrane with a molecular weight of 14,000 Da, and dialyzed in distilled water for 65 hours to remove unreacted antioxidants; finally, the dialysate was freeze-dried at -50°C for 48 hours to obtain catechin Vegetable grafted modified starch, named C-g-S.

[0031] A method for preparing a degradable plastic wrap by grafting modified starch with catechin, the specific implementation steps are as follows:

[00...

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Abstract

The invention relates to catechin graft modified starch, a degradable preservative film and a preparation method thereof. The catechin graft modified starch is characterized in that: an ascorbic acidand hydrogen peroxide redox initiation system is utilized to graft antioxidant molecule chlorogenic acid to the positions 2, 3 and 5 on a glucose unit ring in a starch molecule. The preparation methodincludes: (1) dissolving starch in an acetic acid solution in a closed container, then adding catechin and ascorbic acid, controlling the mass ratio of the catechin, ascorbic acid and starch at 5.225:1.08:6, adding an initiator H2O2 in a nitrogen atmosphere, and carrying out reaction at room temperature for 15-20h; and (2) adding the reaction mixture into a cut-off membrane with a molecular weight of 8000-14000Da, conducting dialysis in distilled water for 60-72h, and freeze-drying dialysate at a temperature ranging from -45DEG C to -50DEG C for 36-48h to obtain C-g-S; and making the C-g-S, PLA and PBST according to a mass ratio of 1-2:6-8:1-2 into the preservative film. The invention has the advantages that: a free radical induced grafting method is employed to prepare the catechin graftmodified starch, the initiator has good environmental affinity, is free of pollution and is low in price; the degradable preservative film has efficient and broad-spectrum antibacterial and antioxidant properties, is safe and harmless to human health, and can effectively prolong the shelf life of food.

Description

technical field [0001] The invention belongs to the technical field of new polymer materials, and in particular relates to a catechin grafted modified starch, a degradable fresh-keeping film and a preparation method thereof. Background technique [0002] With the increasing global environmental pollution, the environmental problems brought by traditional petroleum-based materials to the earth have become increasingly prominent, and the advent of fully biodegradable materials can effectively alleviate oil consumption and solve environmental pollution problems. With the enhancement of people's awareness of environmental protection, fully biodegradable materials are constantly favored by people. [0003] Polylactic acid (PLA) has attracted much attention due to its high mechanical strength, good processability and outstanding biocompatibility. However, PLA has limited its application in many fields due to its high brittleness, and adipic acid-terephthalic acid-butylene glycol ...

Claims

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Application Information

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IPC IPC(8): C08B31/00C08L3/04C08L67/04C08L67/02C08J5/18B65D65/46
CPCC08B31/00C08J5/18B65D65/466C08J2367/04C08J2467/02C08J2403/04Y02W90/10Y02A40/90
Inventor 任鹏黄泳斐李立
Owner 蚌埠天成包装科技股份有限公司
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