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A preparation method of modified zein composite slow-release antibacterial liquid film

A zein and zein soluble technology, which is applied in plant protein processing, edible seed preservation, meat/fish preservation with chemicals, etc., can solve the problem of poor mechanical properties of zein, affecting the mechanical properties of antibacterial films, and Conducive to industrial production and other issues, to achieve the effect of increasing gloss and water resistance, prolonging the freshness preservation effect, and better slow-release performance

Inactive Publication Date: 2017-05-10
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When configuring the antibacterial film, it is necessary to configure the film A separately and then add the solution C to compound. The operation process is complicated, and the compound needs to use ultrasonic dispersion, which increases the production cost and is not conducive to industrial production. The mechanical properties of zein are compared with Poor, directly affects the mechanical properties of the antibacterial film, thus limiting the application of antibacterial film

Method used

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  • A preparation method of modified zein composite slow-release antibacterial liquid film

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Effect test

Embodiment 1

[0024] (1) Preliminary modification of zein

[0025] Dissolve 50g of ascorbic acid in 1L of 70% ethanol aqueous solution and mix evenly, add 90g of zein to prepare a mixed solution I, stir at room temperature for 30min to modify the zein; then add the modified mixed solution Ⅰ The mass concentration of equal volume is 1% sodium chloride solution, the modified zein is settled, the sediment is centrifuged, dried and pulverized to obtain the preliminary modified zein powder;

[0026] (2) Secondary modification of zein

[0027] Dissolve 50g of malic acid in 1L of 70% ethanol aqueous solution and mix evenly, add 90g of the preliminary modified zein powder prepared in step (1) to prepare mixed solution II, stir at room temperature for 30min, then add The mass concentration of the modified mixed solution II is 1% sodium chloride solution, and the secondary modified zein protein is settled, the sediment is separated by centrifugation, dried and crushed to obtain the secondary modifie...

Embodiment 2

[0034] (1) Preliminary modification of zein

[0035] Dissolve 70g of ascorbic acid in 1L of 80% ethanol aqueous solution and mix evenly, add 100g of zein to prepare mixed solution I, stir the mixed solution I at room temperature for 35min to modify zein, then add and modify The final mixed solution I is an equal volume of sodium chloride solution with a mass concentration of 0.5%, the modified zein is sedimented, the sediment is centrifuged, dried and pulverized to obtain a preliminary modified zein powder;

[0036] (2) Secondary modification of zein

[0037] Dissolve 70g of malic acid in 1L of ethanol aqueous solution with a volume fraction of 80% and mix evenly, add 110g of the preliminary modified zein powder prepared in step (1) to prepare the mixed solution II, stir the mixed solution II at room temperature for 45min for zein alcohol soluble protein for secondary modification, and then add a 0.5% sodium chloride solution with a mass concentration equal to that of the sec...

Embodiment 3

[0044] (1) Preliminary modification of zein

[0045] Dissolve 60g of ascorbic acid in 1L of ethanol aqueous solution with a volume fraction of 75% and mix evenly, add 95g of zein to prepare a mixed solution I, stir the mixed solution I at room temperature for 40min to modify the zein, then add and modify The final mixed solution I is an equal volume of sodium chloride solution with a mass concentration of 2%, the modified zein is sedimented, the sediment is centrifuged, dried and pulverized to obtain a preliminary modified zein powder;

[0046] (2) Secondary modification of zein

[0047] Dissolve 60g of malic acid in 1L of ethanol aqueous solution with a volume fraction of 75% and mix evenly, add 100g of the preliminary modified zein powder prepared in step (1) to prepare mixed solution II, and stir the mixed solution II at room temperature for 40 minutes to treat zein alcohol soluble protein for secondary modification, then add a sodium chloride solution with a mass concentr...

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Abstract

A method for preparing a modified zein composite slow-release antibacterial liquid film. First, the zein is initially modified with ascorbic acid, then the zein is secondary modified with malic acid, and finally the zein is modified with citric acid. For the final modification of zein, add powdered sodium hydroxide to adjust the pH value, and keep warm to obtain the final modified zein film liquid; melt the beeswax and mix it with oleic acid, and add it to the final modified corn Stir evenly in the prolamin film liquid, cool to room temperature, then add nisin and emulsifier lecithin, homogenize, and obtain the modified zein compound slow-release antibacterial liquid film. The advantages are: good film-forming mechanical strength, safe and edible, and better slow-release performance, long-lasting antibacterial effect, can form a protective film on the surface of objects, and can be used for food preservation of fruits, vegetables, meat, seafood and nuts.

Description

technical field [0001] The invention belongs to the technical field of food antibacterial and fresh-keeping, and in particular relates to a preparation method of a modified zein composite slow-release antibacterial liquid film. Background technique [0002] Due to the hazards of synthetic plastics to the environment and human health, finding new materials that can replace their packaging and fresh-keeping functions has become a research hotspot in recent years. Zein is a water-insoluble storage protein in corn. It has good film-forming properties, biodegradability and biocompatibility, and is an excellent substitute for synthetic plastics. However, zein film-forming has the same problem of poor mechanical properties as other plant proteins, and its antibacterial property as a fresh-keeping material is poor, which limits its application range. [0003] CN201110303780 discloses "a method for coating fresh-keeping mutton". A solution with a ratio of 1:9 of zein:80% ethanol is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L3/3526
CPCA23B4/20A23B7/154A23B9/26A23J3/14A23L3/3526Y02A40/90
Inventor 何余堂朱力杰徐永霞解玉梅尹天罡刘贺朱丹实马涛王勃
Owner BOHAI UNIV
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