A kind of method that utilizes high-concentration starch milk to continuously produce starch saccharification product

Abstract

The present invention provides a method for continuously producing starch saccharification products by utilizing high-concentration starch milk. The method uses a combination of medium-temperature amylase, high-temperature amylase, lipase and protease in a pre-liquefaction step, and implements a two-step pre-liquefaction step. Then, continuous spray liquefaction is carried out, which effectively reduces the viscosity of starch in the process of heating and gelatinization, so that high-concentration starch milk can be better liquefied by spray liquefaction. In addition, the method uses an efficient complex saccharification enzyme that removes glucosidase as an enzyme preparation in the saccharification step, which effectively inhibits the occurrence of complex reactions in the saccharification stage, ensures the yield of glucose in the starch saccharification product, and thus achieves starch saccharification. Balance of energy reduction, viscosity control and glucose yield in the production of saccharified products.

Description

technical field [0001] The invention belongs to the technical field of starch sugar processing, and in particular relates to a method for continuously producing starch saccharification products using high-concentration starch milk. Background technique [0002] Starch sugar is a general term for sugar products obtained from starch as raw material by enzymatic hydrolysis sugar production process or acid sugar production process. Starch sugar is an important raw material of my country's food industry and a beneficial supplement for people's daily consumption of sugar. Therefore, it is particularly important to improve the quality of starch sugar products and reduce production costs. In recent years, the enzymatic hydrolysis sugar production process has gradually replaced the acid sugar production process. Generally speaking, the enzymatic hydrolysis sugar production process is generally divided into two stages: liquefaction and saccharification: firstly, the starch milk is li...

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Problems solved by technology

However, at the above temperature, the gelatinization of starch is still very serious, and the limitation of viscosity on the process is still very obvious, so it is usually difficult to increase the initial concentration of starch milk to more than 35%.

On the other hand, when indirect heating is used, the starch is heated for too long, resulting in a high viscosity of the liquefied liquid, which complicates pumping and subsequent processing

[0004] In the enzymatic hydrolysis sugar production process, the increase of the initial concentration of starch milk will lead to the following two technical problems: 1) In the liquefaction stage, the viscosity of high-concentration starch will increase sharply during the heating and gelatinization process, making liquefaction control become difficult. 2) During the saccharification stage, the increase of the substrate concentration will cause the compound reaction of glucose to generate a large amount of disaccharides and trisaccharides, thereby reducing the yield of glucose

[0005] However, in the late sugar solution evaporation process of starch sugar production, the concentration of the saccharification solution needs to be concentrated (for example, to 45%), and the lower initial concentration range of starch milk cannot overcome the disadvantages caused by the evaporation of the sugar solution in the later stage of starch sugar production. Problems such as high energy consumption and high water consumption

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