A kind of method for preparing gamma-polyglutamic acid powder by high-temperature spray drying

A technology of polyglutamic acid and spray drying tower is applied in the field of preparing powder of γ-polyglutamic acid extract by high temperature spray drying, which can solve the problem of reducing the production efficiency of γ-polyglutamic acid powder and the high production cost. , the problem of high equipment input cost, to achieve good purity and solubility, improve technical content and international competitiveness, and improve the effect of industrial production efficiency

Active Publication Date: 2019-09-27
GUANGDONG DIMEI NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after the purification of γ-polyglutamic acid fermentation liquid, freeze-vacuum drying method is generally used to make powder, and low-temperature dehydration is used to ensure the purity and solubility of γ-polyglutamic acid powder. It takes a long time (24-48h), and the material needs to be spread out to increase the drying area in order to dry better, and the material agglomerated after drying needs to be processed, ground and sieved before the finished powder is finished.
Various unfavorable factors of freeze-vacuum drying reduce the large-scale industrial production efficiency of γ-polyglutamic acid powder, high equipment investment cost, high energy consumption, and low output, which are the reasons for the high production cost of γ-polyglutamic acid powder main reason

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. The γ-polyglutamic acid fermentation broth is prepared according to the method disclosed in the patent number: ZL 200610122640.5, the invention name: γ-polyglutamic acid producing bacteria and the method for preparing γ-polyglutamic acid using the strain Fermentation broth containing γ-polyglutamic acid.

[0022] The preparation method of the fermentation broth containing γ-polyglutamic acid in this embodiment is as follows: inoculate Bacillus subtilis (Bacillus subtilis) PGA-7 into the fermentation medium of the fermentor, and after 60 hours of stirring and cultivating at 37° C., harvest the obtained Fermentation broth containing γ-polyglutamic acid, the composition of the fermentation medium is as follows: each liter contains 60g of glucose, NH 4 NO 3 20g, K 2 HPO 4 1g, MgSO 4 ·7H 2 O 0.01g, FeCl 3 ·6H 2 O 0.05g, CaCl 2 2H 2 O 0.2g, MnSO 4 ·H 2 O 0.104g, the balance is water. Its preparation method is to mix glucose 60g, NH 4 NO 3 20g, K 2 HPO 4 ...

Embodiment 2

[0026] The preparation steps of the fermentation broth containing γ-polyglutamic acid are the same as in Example 1.

[0027] Then the fermented liquid containing γ-polyglutamic acid is sterilized, decolorized, refined and concentrated to obtain γ-polyglutamic acid extract, the concentration of which contains γ-polyglutamic acid is 15% by mass fraction, pH is 3.0. The γ-polyglutamic acid extract is subjected to high-temperature spray drying, and the inlet air temperature is set to 220°C and the outlet air temperature is 110°C. The γ-polyglutamic acid extract is sprayed into very fine mist droplets through the atomizer After instantaneous high temperature vaporization in the tower to form a powdery solid, the powdery solid is collected by a 2-stage cyclone separator to obtain γ-polyglutamic acid powder. The γ-polyglutamic acid powder is light yellow homogeneous fine powder with a purity of 91% as measured by an ultraviolet spectrophotometer. The powder is completely soluble in ...

Embodiment 3

[0029]The preparation steps of the fermentation broth containing γ-polyglutamic acid are the same as in Example 1.

[0030] Then the fermented liquid containing γ-polyglutamic acid is sterilized, decolorized, refined and concentrated to obtain a γ-polyglutamic acid extract, the concentration of which contains γ-polyglutamic acid is 8% by mass fraction, pH is 7.0. The γ-polyglutamic acid extract is subjected to high-temperature spray drying, and the inlet air temperature is set to 200°C and the outlet air temperature is 90°C. The γ-polyglutamic acid extract is sprayed into very fine mist droplets through the atomizer After instantaneous high temperature vaporization in the tower to form a powdery solid, the powdery solid is collected by a 2-stage cyclone separator to obtain γ-polyglutamic acid powder. The γ-polyglutamic acid powder is light yellow homogeneous fine powder with a purity of 95.1% as measured by an ultraviolet spectrophotometer. The powder is completely soluble in...

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Abstract

The invention discloses a method for preparing gamma-polyglutamic acid powder in a high-temperature spray drying method. The method comprises the following steps: extracting gamma-polyglutamic acid extract liquid, enabling the gamma-polyglutamic acid extract liquid to enter a spray drying tower, setting an air inlet temperature of the drying tower at 180 to 250 DEG C and an air outlet temperature at 90 to 120 DEG C, and spray drying the gamma-polyglutamic acid extract liquid to obtain the gamma-polyglutamic acid powder, wherein the concentration of the gamma-polyglutamic acid in the gamma-polyglutamic acid extract liquid is 5 to 20 percent, and the pH is 3 to 8. The high-temperature spray drying method is used for drying the gamma-polyglutamic acid extract liquid to prepare the gamma-polyglutamic acid powder, so that not only is the production cost reduced and the industrialized production efficiency increased, but also the method has the advantages of energy conservation, emission reduction, and environmental protection. The production process for preparing the gamma-polyglutamic acid powder in the high-temperature spray drying method has significance on increasing the economic benefit and promoting the industrial development, can play a role in positively promoting the application, popularization and industrialization of a biological polymer material in China and improves the technical content and international competitiveness of the product.

Description

technical field [0001] The invention belongs to the technical field of drying, and in particular relates to a method for preparing gamma-polyglutamic acid extract produced by microbial fermentation into powder through high-temperature spray drying. Background technique: [0002] γ-polyglutamic acid is a glutamic acid polymer produced by microbial fermentation. It has the functions of moisturizing, maintaining skin elasticity, increasing the content of natural moisturizing factors, whitening skin color, and promoting the absorption of nutrients. It can be industrially produced through microbial fermentation , Widely used in industries such as cosmetics, food, medicine and agriculture. γ-polyglutamic acid is a polypeptide made of amino acid polymerization, which is a heat-sensitive substance. The protein polypeptide is easily denatured and inactivated at high temperature, resulting in the destruction of its spatial structure. After denaturation, the polypeptide is insoluble in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08L77/04
Inventor 林万泉陈爱美温灼斌冯劲黄小茉邱晓颖施庆珊
Owner GUANGDONG DIMEI NEW MATERIAL TECH CO LTD
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