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Edible rapeseed protein composite film

A technology of rapeseed protein and composite film, which is applied in the field of food packaging and can solve problems such as preparing edible packaging films

Inactive Publication Date: 2018-01-23
NANJING UNIV OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no method to prepare edible packaging film with rapeseed protein as raw material

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1 Preparation of rapeseed protein hydrolyzate

[0018] The preparation of rapeseed protein hydrolyzate comprises the following steps:

[0019] (1) Obtain rapeseed meal. Dry the rapeseed in an oven at 35-40°C for 24 hours at a constant temperature, use a sheller to dehull the rapeseed, and use a blower to screen out the rapeseed husk. The husked rapeseed is crushed to a particle size of 100-800 μm using a high-speed universal grinder to obtain rapeseed meal.

[0020] (2) Degreasing of rapeseed meal. Degreasing the rapeseed meal by Soxhlet extraction method for 6-8 hours, and then crushing to a particle size of 100-600 μm to obtain the defatted rapeseed meal. The defatted rapeseed meal was packed in a sealed bag and refrigerated at 4°C for later use.

[0021] (3) Rapeseed protein was extracted from defatted rapeseed meal by alkali dissolution and acid precipitation. Weigh defatted rapeseed meal, dissolve it in deionized water (the mass ratio of defatted rapes...

Embodiment 2

[0028] Embodiment two prepares edible rapeseed protein composite film

[0029] Take the rapeseed protein hydrolyzate with a degree of hydrolysis of 10%, and use water as a solvent to prepare a 40 g / L rapeseed protein hydrolyzate solution. With the acetic acid aqueous solution of 20g / L as solvent, the chitosan solution of preparation 40g / L, as solution B. The rapeseed protein hydrolyzate solution and solution B were fully stirred with a magnetic stirrer respectively, and then mixed in equal volumes to obtain solution A. Add 8 g of glycerin to each liter of solution A, and fully stir with a magnetic stirrer (rotating speed: 500 r / min) at 60° C. for 2 hours to obtain a film-forming solution. Pour the film-forming solution into the groove (10cm×10cm×1mm) of the polytetrafluoropropylene mold to form it, dry it in a constant humidity and constant temperature drying oven at 27°C and a relative humidity of 50%-55% for 24 hours, and peel off the film to obtain Rapeseed protein compos...

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Abstract

The invention provides an edible rapeseed protein composite film, belongs to the technical field of food package, and particularly relates to an edible rapeseed protein composite film. The edible rapeseed protein composite film is prepared by a method with the following steps of hydrolyzing rapeseed protein extracted from rapeseed meal by alkaline protease, with hydrolysis degree of 10 to 20%; adjusting the pH (potential of hydrogen) value of hydrolysis liquid to acidity, obtaining supernatant, and freeze-drying, so as to obtain rapeseed protein hydrolysate; preparing a filming solution containing the rapeseed protein hydrolysate, chitosan and glycerin, and adopting a calendering method, so as to prepare the edible rapeseed protein composite film. An inventor accidentally finds that afterthe rapeseed protein is hydrolyzed and mixed with the chitosan to form the composite film, the certain antibacterial characteristic is realized, and the higher tensile strength, higher elongation rateat break and lower water vapor permeation coefficient are realized, namely better mechanical property and water blocking property; because the rapeseed protein is supplied from the rapeseed meal after oil pressing, the cost is lower, the safety of consumers is ensured, and the environment-friendly effect is realized.

Description

technical field [0001] The invention relates to the technical field of food packaging, in particular to an edible rapeseed protein composite film. Background technique [0002] In recent years, research on edible packaging films has become more and more popular. Edible packaging film Compared with industrial synthetic packaging materials, this bio-based packaging film can reduce the impact on the environment, and will likely replace petroleum-based packaging films. The use of rapeseed protein isolated from rapeseed to prepare edible composite films has many advantages. First, rapeseed protein has high nutritional value, no limiting amino acids, and the composition of amino acids is also very reasonable, especially containing enough basic amino acids (lysine) and sulfur-containing amino acids (methionine), which basically meet the requirements of FAO and WTO recommended model. Second, the output of rapeseed in China is extremely high, and rapeseed is mostly used for the ex...

Claims

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Application Information

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IPC IPC(8): C08L89/00C08L5/08C08K5/053C08J5/18
Inventor 何荣汪玉娇章铖殷涛鞠兴荣袁建李扬
Owner NANJING UNIV OF FINANCE & ECONOMICS
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