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

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...

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