Decoloration method of yellow zein

A zein, yellow technology, applied in the field of decolorization of yellow zein, to achieve the effect of high pigment adsorption rate, simple decolorization process and low cost

Active Publication Date: 2017-04-19
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the defects of the existing zein decolo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Zein solution preparation: use 95% ethanol solution to prepare a zein solution with a concentration of 5% (w / v) at 30°C;

[0020] (2) Adsorption decolorization: add a compound decolorant to the zein solution (the compound decolorant is obtained by compounding attapulgite clay and diatomite clay at a mass ratio of 1:0.1, and the compound decolorant and zein The mass ratio of the solution is 1:5), and the adsorption was oscillated for 120 min at a temperature of 50 °C and an oscillating frequency of 100 rpm. After the completion of adsorption decolorization, centrifuge at 3000rpm for 10min to separate the composite decolorizer and obtain zein extract;

[0021] (3) Precipitate wet powder: adjust the pH value of the zein extract solution to the isoelectric point of protein 6.2 with hydrochloric acid, and precipitate to obtain the zein wet powder;

[0022] (4) Vacuum freeze-drying: Vacuum freeze-dry the wet zein powder: the freezing temperature is -10°C, the drying temp...

Embodiment 2

[0024] (1) Zein solution preparation: use 90% ethanol solution to prepare a zein solution with a concentration of 10% (w / v) at 45°C;

[0025] (2) Adsorption decolorization: add a compound decolorizer to the zein solution (the compound decolorizer is obtained by compounding attapulgite clay and diatomite clay at a mass ratio of 1:10, and the compound decolorizer and zein solution The mass ratio was 1:10), and the adsorption was oscillated for 90 min at a temperature of 40 °C and an oscillating frequency of 150 rpm. After completion of adsorption and decolorization, centrifuge at 10,000 rpm for 30 minutes to separate the composite decolorizing agent and obtain zein extract;

[0026] (3) Precipitate wet powder: adjust the pH value of the zein extract solution to the isoelectric point of protein 6.2 with hydrochloric acid, and precipitate to obtain the zein wet powder;

[0027] (4) Vacuum freeze-drying: The wet powder of zein is vacuum freeze-dried. The freezing temperature was ...

Embodiment 3

[0029] (1) Zein solution preparation: use 85% ethanol solution to prepare a zein solution with a concentration of 8% (w / v) at a temperature of 50°C;

[0030] (2) Adsorption decolorization: Add a compound decolorizer to the zein solution (the compound decolorizer is obtained by compounding attapulgite clay and diatomite clay at a mass ratio of 1:1, and the compound decolorizer and zein The solution mass ratio is 1:15), at a temperature of 70°C and an oscillation frequency of 200 rpm, the adsorption was oscillated for 60 min. After the completion of adsorption and decolorization, centrifuge at 5000rpm for 20min to separate the composite decolorizer and obtain zein extract;

[0031] (3) Precipitate wet powder: adjust the pH value of the zein extract solution to the isoelectric point of protein 6.2 with hydrochloric acid, and precipitate to obtain the zein wet powder;

[0032] (4) Vacuum freeze-drying: Vacuum freeze-dry the wet zein powder: the freezing temperature is -18°C, the dr...

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Abstract

The invention discloses a decoloration method of yellow zein, and belongs to the technical field of deep processing of agricultural and sideline products. According to the decoloration method, an attapulgite clay and kieselguhr clay complex is adopted as a compound decolorising agent for vibrating adsorption decoloration, the compound decolorising agent is centrifugally separated out after adsorption decoloration is completed, and a zein extraction solution is obtained; and the pH value of the zein extraction solution is adjusted to the protein isoelectric point, precipitating is carried out, zein wet powder is obtained, vacuum freeze drying is carried out, and a white zein product is obtained. All the performance indexes of the product can reach the food and drug grade safety standard, the zein is widely applied to the food and medicine industry, the additional value of corn gluten meal is remarkably improved, and comprehensive development and utilization of the corn gluten meal are promoted. In addition, the decoloration method has the beneficial effects of being simple, efficient, environment-friendly, low in cost and the like, and is suitable for large-scale production.

Description

technical field [0001] The invention discloses a method for decolorizing yellow zein, in particular to a method for decolorizing yellow zein by using diatomite and attapulgite clay as a composite decolorizing agent, and belongs to the technical field of deep processing of agricultural and sideline products. Background technique [0002] Zein is a mixture of polypeptides bound by disulfide bonds. Using modern morphological methods to study zein, it is found that protein particles can combine together to form a fibrous structure, which may be the structural basis of zein's film-forming properties. After forming a film, zein has good hydrophobicity and oxygen barrier properties, and is widely used in food, textile, papermaking, and medicine fields, especially as fresh-keeping film for fruits and vegetables, edible packaging materials, biodegradable plastics, etc. etc., has a broad market prospect. [0003] However, the existing industrial zein production mainly uses corn glut...

Claims

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Application Information

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IPC IPC(8): C07K14/425C07K1/30C07K1/14
CPCC07K14/425
Inventor 刘红邵士俊徐健梁卿
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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