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Method for treating starchy raw material and method for preparing citric acid

A technology of starchy raw materials and processing methods, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve problems such as difficult gelatinization, difficult liquefaction of starchy raw materials, and unfavorable effects of glucoamylase , to achieve the effect of facilitating saccharification, shortening the fermentation cycle, and reducing the content of residual starch

Inactive Publication Date: 2012-01-18
COFCO BIOTECHNOLOGY CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] (1) The gelatinization is not complete. After many starchy raw material particles with larger particle sizes absorb water and swell, only the surface is hydrolyzed by starch. The crystalline region swells, and the inner crystalline region is difficult to achieve gelatinization
[0006] (2) The liquefaction is not complete, and it is difficult for amylase to interact with the unswollen starch crystal area. Although more amylase is added, the starchy raw material is still difficult to liquefy. In order to pass the iodine test, more amylase must be added. , causing waste of amylase
Not conducive to the action of glucoamylase

Method used

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  • Method for treating starchy raw material and method for preparing citric acid

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preparation example Construction

[0037]The present invention also provides a method for preparing citric acid. The method includes treating the starchy raw material according to the above method to obtain an enzymatic hydrolysis product, and fermenting the enzymatic hydrolysis product in the presence of Aspergillus niger. Preferably, the enzymatic hydrolysis product is used as a fermentation broth, sterilized at 80-90°C for 15-30 minutes, and after cooling down to 36-38°C, Aspergillus niger is inoculated into the fermentation broth for fermentation.

[0038] Since the preparation method of citric acid provided by the present invention mainly involves the improvement of the processing method of starchy raw materials before fermentation, there is no special limitation on the fermentation process, which can be the same as the prior art. For example, the type and amount of Aspergillus niger and the conditions of fermentation can be carried out with reference to the prior art, and the present invention will not rep...

Embodiment 1

[0044] 100 parts by weight of corn are pulverized to obtain a pulverized product with an average particle diameter of 400 microns, and the pulverized product is mixed with 400 parts by weight of water at 45° C. to obtain a starch slurry, and the pH value of the starch slurry is adjusted to 5.5.

[0045] At 45°C, the starch slurry was mixed with the α-amylase of 6.4 enzyme activity units / g corn flour for 60 minutes to obtain a mixture, which was sprayed into contact with steam at 156°C in an injector (steam and mixture The weight ratio is 0.05:1), the contact time is 5 seconds, so that the temperature of the mixture after contacting with the steam is 95°C, and the laminar flow is maintained for 120 minutes to obtain a primary liquefied liquid.

[0046] The above-mentioned primary liquefied liquid is again sprayed and contacted with steam at 156°C in the injector (the weight ratio of steam to mixture is 0.05:1), and the contact time is 3 seconds, so that the temperature of the m...

Embodiment 2

[0051] 100 parts by weight of corn are pulverized to obtain a pulverized product with an average particle diameter of 400 microns, and the pulverized product is mixed with 180 parts by weight of water at 60° C. to obtain a starch slurry, and the pH value of the starch slurry is adjusted to 6.2.

[0052] At 60°C, the starch slurry was mixed with the α-amylase of 12 enzyme activity units / g corn flour for 60 minutes to obtain a mixture, which was sprayed into contact with steam at 160°C in an injector (steam and mixture The weight ratio is 0.1:1), the contact time is 1 second, so that the temperature of the mixture after contacting with steam is 98° C., and the laminar flow is maintained for 180 minutes to obtain a primary liquefied liquid.

[0053] The above-mentioned primary liquefied liquid is again sprayed and contacted with steam at 160°C in the injector (the weight ratio of steam to mixture is 0.1:1), and the contact time is 3 seconds, so that the temperature of the mixture...

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Abstract

The invention relates to a method for treating a starchy raw material and a method for preparing citric acid. The method for treating the starchy raw material comprises the following steps of: mixing powder of the starchy raw material and water to obtain farinaceous size, and mixing the farinaceous size and first part amylase to obtain a mixture; performing primary injection on the mixture by using first steam at the temperature of between 80 and 100 DEG C to obtain primary emulsion, and performing secondary injection on the primary emulsion by using second steam at the temperature of between120 and 150 DEG C to obtain secondary emulsion; performing flash evaporation and reducing the temperature; and mixing a product obtained through flash evaporation and temperature reduction and secondpart amylase, and performing enzymolysis. By the method, a dextrose equivalent (DE) value can be reduced, and the fermentation period of the citric acid can be shortened.

Description

technical field [0001] The invention relates to a method for processing starchy raw materials and a method for preparing citric acid. Background technique [0002] Citric acid is an organic acid widely used in industries such as beverage, food and medicine. At present, citric acid is mainly prepared by fermentation. Generally, the starchy raw material is first pulverized, and the pulverized product is mixed with water to obtain a starch slurry, and the starch slurry is mixed with an enzyme for enzymolysis to obtain an enzymatic hydrolysis product (enzymolysis liquefaction solution) , and inoculate Aspergillus niger into the fermentation broth containing the enzymatic hydrolysis product to ferment to produce citric acid. [0003] In the above process, the enzymatic hydrolysis (liquefaction) of starchy raw materials has a greater impact on the fermentation cycle of citric acid. The current enzymatic hydrolysis (liquefaction) process of starchy raw materials mostly adopts the...

Claims

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Application Information

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IPC IPC(8): C12P19/14C12P7/48C12R1/685
Inventor 周勇熊结青张夕红朱继成陈程
Owner COFCO BIOTECHNOLOGY CO LTD
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