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A kind of high-strength hordein-chitosan composite film and preparation method thereof

A technology of hordein and chitosan, which is applied in the field of food preservation, can solve problems such as cross-linking strength measurement, and achieve the effects of low production cost, easy promotion and use, and excellent mechanical strength

Active Publication Date: 2022-03-11
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific crosslink strength was not measured

Method used

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  • A kind of high-strength hordein-chitosan composite film and preparation method thereof
  • A kind of high-strength hordein-chitosan composite film and preparation method thereof
  • A kind of high-strength hordein-chitosan composite film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1, a kind of preparation method of high strength hordein chitosan composite film

[0048] The preparation method comprises the following steps:

[0049] S1. Extraction of hordein: barley seeds were ground into powder using a grinder, and then stirred continuously with n-hexane at a ratio of 5:1 (v / w) for 2 h at 25 °C. The homogenate was centrifuged in a high-speed refrigerated centrifuge at 25°C, 2000×g for 5 min. The precipitate obtained was washed once by centrifugation with ultrapure water and 0.1 M sodium chloride solution, respectively. The above precipitate was dispersed in 75% (v / v) ethanol aqueous solution according to the ratio of solvent to barley flour 10:1 (v / w), and stirred at 55 °C for 2 h at 500 rpm. The supernatant was collected by centrifugation, centrifuged at 4000×g for 5 min, and residual ethanol was removed using a rotary evaporator at 45°C. Samples were freeze-dried in a freeze dryer for 48 h, and the dry powder was stored in plastic ...

Embodiment 2

[0054] Embodiment 2, hordein chitosan composite film characterization

[0055] To further analyze the obtained composite film, the hordein-chitosan composite film was first fixed on the aluminum support with double-sided carbon tape, and coated with a layer of fine gold-palladium layer, using scanning electron microscope, at the acceleration of 3Kv Voltage, working distance of 10.9~11.7mm and magnification of 10,000 times were used to observe the surface morphology of the film, and it was found that the chitosan film ( figure 1 Middle A) The surface cracks are small, and the rice grains have more protrusions; the composite film obtained by mixing hordein and chitosan at a ratio of 1:3 ( figure 1 Middle B) The surface has large protrusions and small pores; a composite film obtained by mixing hordein and chitosan at a ratio of 1:5 ( figure 1 Middle C) There are slight streaks on the surface, and the overall smoothness; the composite film obtained by mixing hordein and chitosan ...

Embodiment 3

[0058] Embodiment 3, the measurement of the thickness of hordein chitosan composite film and mechanical property

[0059] The thickness of the sample was measured with a digital micrometer, and 6 points were randomly selected around the composite film to calculate the average thickness. The tensile strength (TS) and elongation at break (EAB) of the composite film were measured by a physical property analyzer with an initial distance of 60 mm and a probe speed of 0.5 mm / s. The composite film was cut into strips of 20×80 mm, and each group was repeated at least 3 times. The calculation formulas of TS and EAB are as follows:

[0060] TS(MPa)=P / (b×d)

[0061] EAB(%)=(L-L 0 ) / L 0 ×100%

[0062] In the formula, P is the maximum force (N), b is the thickness (mm), and d is the film width (mm);

[0063] L is the length (mm) when the film breaks, L 0 is the initial length of the film (mm).

[0064] The thickness of the hordein / chitosan-based composite film was reduced compared...

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Abstract

The invention discloses a high-strength hordein-chitosan composite film and a preparation method thereof. The composite film is prepared by dissolving and mixing hordein and chitosan as substrates, and finally adopting drop casting technology. The method of the invention has simple process, and the prepared composite film has uniform texture, has the highest mechanical strength compared with similar composite films, and can meet the requirements of food and medicine packaging.

Description

technical field [0001] The invention belongs to the technical field of food preservation, and in particular relates to a high-strength hordein-chitosan composite film and a preparation method thereof. Background technique [0002] Food packaging occupies an important position in the food industry, and its main function is to prevent biological, chemical and physical hazards in food circulation and transportation. However, with the development of science and technology, the harm of non-degradable packaging materials to the environment has attracted more and more attention from all over the world. Therefore, the development of renewable and environmentally friendly biopolymer materials is imminent. Natural polysaccharides, proteins, and lipids are biopolymers with the advantages of renewable, degradable, edible, and biocompatibility. Because they can be used as replicas of synthetic organic polymers (such as plastics), they are very promising. Alternative material for foregr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L5/08C08L89/00
CPCC08J5/18C08J2305/08C08J2489/00
Inventor 梅晓宏程思琪李非凡张晓云赵天瑜
Owner CHINA AGRI UNIV
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