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Photooxidation-resistant composite packaging film as well as preparation method and application thereof

A composite packaging film, anti-photooxidation technology, applied in chemical instruments and methods, food ingredients as antioxidants, packaging, etc., can solve the problem of no phytosterol photooxidation packaging film, etc., achieve excellent light shielding properties, simple raw materials Easy to obtain, the effect of improving oxidation stability

Active Publication Date: 2022-05-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, different natural pigments only have a photoblocking effect on light in a specific range, and there is no report on a packaging film that can specifically block the photooxidation of phytosterols.

Method used

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  • Photooxidation-resistant composite packaging film as well as preparation method and application thereof
  • Photooxidation-resistant composite packaging film as well as preparation method and application thereof
  • Photooxidation-resistant composite packaging film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Membrane making

[0042] 1. Use a plastic blown film machine to make a film, and add a film-forming material to the feed port of the blown film machine: take a certain amount of ethylene-vinyl alcohol copolymer (EVOH), add 0.5%, 1%, 2%, 3% , 4%, 5% (w / w) TiO 2 , The processing temperature of the film blowing machine is: extruder 180°C, head 220°C.

[0043] 2. Regarding the determination of the light transmittance of the packaging film, use a UV-VIS scanning spectrophotometer to test the light transmittance percentage of the film treatment, set the 2nm slit width, scan from 280 to 700nm, and the sampling interval is 1nm. Light transmittance measurements were recorded for each packaging film at 300, 370, 400, 470, 535, 580, 650 nm. The results are shown in Table 1.

[0044] Table 1

[0045]

[0046] As shown in Table 1, adding TiO 2 Can effectively shield visible light from 280 to 470nm, when TiO 2 The content is 4%, and it has the best blocking effect on spec...

Embodiment 2

[0054] 1. Film making: use a plastic blown film machine to make a film, and add film-forming materials to the feed port of the blown film machine according to the formula in Table 3: take a certain amount of high-density polyethylene (HDPE), add red commercial pigments, TiO 2 , The processing temperature of the film blowing machine is: extruder 180°C, head 220°C.

[0055] 2. Measure the light transmittance of the packaging film, and the results are shown in Table 3.

[0056] table 3

[0057]

[0058] It can be seen from Table 3 that the red dye can effectively shield visible light above 620nm, and the red dye is 4%, which has the best blocking effect on specific visible light.

[0059] 3. Detect the impact of the packaging film on the photooxidation of phytosterols, the operation steps are the same as in Example 1. The results are shown in Table 4.

[0060] Table 4

[0061]

Embodiment 3

[0063] 1. Film making: use a plastic co-extrusion casting machine for film making: add a mixture of polyethylene 75% (w / w) and acrylic acid 25% (w / w) to the outer layer, or add a certain amount of light barrier Material TiO 2 ; Add a certain amount of pigment / dye, a mixture of deoxidizer and polyethylene to the inner layer to make a film; the inner and outer layers are extruded to form a film at the same time, and the thickness of the film provided is 110 μm. The processing temperature of the casting machine is: extruder 200 ° C, The temperature of the head is 220°C, and the temperature of the cooling roll is 25°C.

[0064] 2. Measure the light transmittance of the packaging film, and the results are shown in Table 5.

[0065] table 5

[0066]

[0067] It can be seen from Table 5 that adding TiO 2 The packaging film formed with red pigment and dye can effectively shield visible light above 280-470nm and 620nm, and effectively improve the photooxidative stability of phyto...

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Abstract

The invention discloses an anti-photooxidation composite packaging film as well as a preparation method and application thereof, and belongs to the technical field of food packaging. The composite packaging film comprises an outer layer film and an inner layer film, wherein the outer layer film comprises a base material and a light barrier material; and the inner layer film comprises a base material, a pigment and a color fixative. A light blocking material is added into the outer layer film, visible light of 280-470 nm is effectively shielded, red pigment is added into the inner layer film, visible light of 620 nm or above is effectively shielded, meanwhile, oxygen in the packaging internal environment is removed, and the film can be applied to food, cosmetics, health care products and biological products which are prone to being affected by photooxidation and are rich in sterol. Aiming at the development path of sterol photooxidation, the invention provides the method for improving the photooxidation stability of phytosterol, the composite antioxidant is used in cooperation on the basis of the composite packaging film, the chain reaction of sterol photooxidation is blocked, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of food packaging, in particular to a method for improving the photooxidation stability of phytosterols by using a photooxidation-resistant composite packaging film. Background technique [0002] Phytosterol (PS) is a functional component that exists in a free state or in a state combined with fatty acids and sugars, and is widely present in the cell membranes of various plants such as vegetables and fruits. Sterol compounds have a variety of beneficial physiological functions to the human body. Studies have found that plant sterols can lower blood cholesterol, prevent and treat prostate hypertrophy, inhibit tumors, inhibit breast hyperplasia, and regulate immunity. Since animals cannot synthesize PS endogenously, the human body can only obtain it by ingesting food from plant sources. [0003] Phytosterols are easily affected by environmental factors such as radiation, heat, oxygen, and metal ions to genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32
CPCB32B27/32B32B27/306B32B27/08B32B27/18B32B27/20A23L3/349A23L3/3463A23L3/3508A23L3/3499B65D65/40C08J5/18B32B2250/246B32B2307/412B32B2307/7244B32B2553/00A23V2002/00C08J2323/08C08K2003/2241C08J2323/06C08J2433/02C08J2423/06A23V2200/02A23V2250/21A23V2250/213A23V2250/708
Inventor 陆柏益杨博文赵添黄伟素杨暄柳岩
Owner ZHEJIANG UNIV
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