Glutamic acid fermentation method and monosodium glutamate production method

Abstract

The invention belongs to the technical field of glutamic acid fermentation, and discloses a glutamic acid fermentation method and a monosodium glutamate production method. Corn steep liquor is concentrated and is subjected to enzymolysis at proper temperature, pH value and time; and activated carbon is added for adsorption decoloration, and a decolorizing liquid is used for glutamic acid fermentation to provide a nitrogen source and inorganic phosphorus so as to replace the nitrogen source and phosphate in an original culture medium. The baume degree of the concentrated corn steep liquor is 20-25. The hydrolase comprises phytic acid complex enzyme and protease. The corn steep liquor is subjected to enzymolysis, so that the content of available free phosphorus and amino acid is increased, inorganic phosphorus and part of protein hydrolysate in glutamic acid fermentation ingredients are completely replaced, the resource utilization rate is increased, the production cost is reduced, dipotassium phosphate is saved by 9.09 kg/ton in unit glutamic acid, and 1.5 kg/ton defoaming agent is saved. Resin decoloration replaces decoloration of granular activated carbon in the original process,the light transmittance of a neutralization solution can be improved to 93%-98%, and 75% of washing sewage can be reduced compared with the original process.

Description

technical field [0001] The invention belongs to the technical field of glutamic acid fermentation, and in particular relates to a glutamic acid fermentation method and a method for producing monosodium glutamate. Background technique [0002] At present, glutamic acid is the main precursor material for the production of sodium glutamate (monosodium glutamate). After neutralization of glutamic acid and sodium hydroxide or sodium carbonate, glutamic acid with umami can be obtained through processes such as separation, decolorization, and crystallization. Sodium Acid (MSG). Among them, the glutamic acid fermentation process needs to consume a large amount of nutrients such as carbon sources, nitrogen sources, and inorganic salts. In order to save production costs, enterprises usually produce starch by themselves, and then enzymatically saccharify it into glucose for fermentation. At the same time, the corn steep liquor (corn soaking water) produced in the production of corn st...

AI Technical Summary

Problems solved by technology

[0008] The composition of corn steep liquor is complex but nutritious. Although a single enzymatic hydrolysis or decolorization process can improve the utilization rate and fermentation stability to a certain extent, it cannot systematically solve the problem of corn steep liquor utilization.

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