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An oxygen-absorbing film based on tea polyphenol-β-cyclodextrin inclusion compound and its preparation method

A technology of cyclodextrin inclusion compound and tea polyphenols, which is applied in the field of food packaging materials, can solve the problems of low oxygen absorption capacity, decreased mechanical strength of packaging materials, insufficient oxygen absorption performance, etc., and achieve the effect of ensuring oxygen absorption performance

Active Publication Date: 2019-10-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oxygen-absorbing resins usually composed of olefinic unsaturated compounds and their mixtures or copolymers and transition metal salts have the following problems: the added transition metal salts, as the oxygen absorption reaction progresses, the polymer ages, and the mechanical strength of the packaging material may appear. decline, coloring, and even the dissolution of transition metal salts
In addition, the oxygen-absorbing performance is insufficient, and the unique odor that is believed to be produced by the by-product of the oxygen-absorbing reaction remains in the packaging container, so it is difficult for the prepared oxygen-absorbing film to directly contact food
[0006] Commonly used natural organic oxygen-absorbing substances mainly include ascorbic acid-based oxygen-absorbing agents and α-tocopherol. On the one hand, their oxygen-absorbing capacity is low, and transition metal catalysts still need to be added to catalyze their oxidation process to meet the requirements of commercial applications. On the other hand, On the one hand, natural organic oxygen-absorbing substances generally have the problem of poor thermal stability, which cannot meet the requirements of mass production through co-extrusion casting

Method used

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  • An oxygen-absorbing film based on tea polyphenol-β-cyclodextrin inclusion compound and its preparation method
  • An oxygen-absorbing film based on tea polyphenol-β-cyclodextrin inclusion compound and its preparation method
  • An oxygen-absorbing film based on tea polyphenol-β-cyclodextrin inclusion compound and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Dissolve 10.6g of β-cyclodextrin in water, then dissolve 8.5g of tea polyphenols and 3.2g of citric acid in absolute ethanol, and add dropwise to the aqueous solution of β-cyclodextrin under constant stirring.

[0035] (2) The mixed solution was stirred at 50° C. for 4 hours, cooled to room temperature after the end, and placed in a refrigerator until the white powder precipitated at the bottom of the Erlenmeyer flask no longer increased. Vacuum filtration was carried out with a circulating vacuum pump. During the suction filtration, it was quickly washed with water and absolute ethanol successively to obtain a white powder, which was placed in a vacuum drying dish to dry and stored for future use.

[0036] (3) Weigh 40g of oxygen absorbing agent and 460g of LDPE masterbatch, mix them uniformly in a mixer, add them into the hopper of an extruder, melt, extrude and cut to obtain pellets of suitable size and uniform thickness.

[0037] (4) Add the obtained pellets to ...

Embodiment 2

[0039] (1) Dissolve 6.8g of β-cyclodextrin in water and heat to dissolve. Then 9.4g of tea polyphenols and 1.3g of citric acid were dissolved in absolute ethanol, and were added dropwise into the aqueous solution of β-cyclodextrin under continuous stirring.

[0040](2) The mixed solution was stirred at 50° C. for 4 hours, cooled to room temperature after the end, and placed in a refrigerator until the white powder precipitated at the bottom of the Erlenmeyer flask no longer increased. Vacuum filtration was carried out with a circulating vacuum pump. During the suction filtration, it was quickly washed with water and absolute ethanol successively to obtain a white powder, which was placed in a vacuum drying dish to dry and stored for future use.

[0041] (3) Weigh 10g of oxygen absorbing agent and 490g of LDPE masterbatch, mix them uniformly in a mixer, add them into the hopper of an extruder, melt, extrude and cut to obtain pellets of suitable size and uniform thickness.

[0...

Embodiment 3

[0044] (1) Dissolve 8.2g of β-cyclodextrin in water and heat to dissolve. Then 12.6g of tea polyphenols and 0.36g of citric acid were dissolved in absolute ethanol, and were added dropwise into the aqueous solution of β-cyclodextrin under continuous stirring.

[0045] (2) The mixed solution was stirred at 50° C. for 4 hours, cooled to room temperature after the end, and placed in a refrigerator until the white powder precipitated at the bottom of the Erlenmeyer flask no longer increased. Vacuum filtration was carried out with a circulating vacuum pump. During the suction filtration, it was quickly washed with water and absolute ethanol successively to obtain a white powder, which was placed in a vacuum drying dish to dry and stored for future use.

[0046] (3) Weigh 25g of oxygen absorbing agent and 475g of LDPE masterbatch, mix them uniformly in a mixer, add them into the hopper of an extruder, melt, extrude and cut to obtain pellets of suitable size and uniform thickness.

...

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Abstract

The invention relates to an oxygen-absorbing thin film based on a tea polyphenol-beta-cyclodextrin inclusion complex and a preparation method of the oxygen-absorbing thin film. The tea polyphenol-beta-cyclodextrin inclusion complex comprises 30-66% of tea polyphenol, 45-80% of beta-cyclodextrin and 2-6% of citric acid, wherein the tea polyphenol is an active oxygen-absorbing substance, the beta-cyclodextrin is a wall material, and the citric acid is an oxygen-absorbing auxiliary. An oxygen-absorbing thin film base material is low-density polyethylene (LDPE) resin. The oxygen-absorbing thin film is prepared by a coextrusion tape casting method. The prepared oxygen-absorbing thin film can have excellent oxygen absorbing performance without a transition metal catalyst and can be used for prolonging the shelf life of oxygen-sensitive food.

Description

technical field [0001] The invention relates to a food oxygen-absorbing packaging material, in particular to an oxygen-absorbing film based on a tea polyphenol-β-cyclodextrin inclusion compound and a preparation method thereof, belonging to the technical field of food packaging materials. Background technique [0002] The residual oxygen in the headspace of the packaging will cause oxidative deterioration of the food and the growth of aerobic bacteria or mold reproduction, so the oxygen in the food packaging must be lower than its allowable value. The traditional methods to reduce the oxygen content in the packaging include modified atmosphere packaging and vacuum packaging. There are several methods, but these methods cannot completely remove the oxygen in the package, and there will still be 2% to 3% oxygen remaining. Oxygen-absorbing packaging can not only block the outside oxygen from entering the packaging, but also actively remove the oxygen in the packaging. Compared ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L5/16C08B37/16
Inventor 卢立新蔡莹
Owner JIANGNAN UNIV
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