Method for preparing corn starch

A technology for corn starch and starch milk, applied in the field of starch processing, can solve the problems of high energy consumption, high cost, low efficiency and the like, and achieve the effects of simple process and low cost

Active Publication Date: 2010-12-01
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The prior art discloses a variety of methods for preparing amylose starch. For example, Roger P directly heat-processes starch to separate amylose and amylopectin. This method consumes a lot of energy and has low efficiency; US Patent US2007022500 -A1 discloses a method for preparing amylose by using high-amylose starch, but high-amylose starch is obtained from transgenic plants, the yield is small, and there is controversy whether it can be used in the food industry; Japanese Patent JP76046817-B1 discloses a method for using Enzyme treatment of side chains of amylopectin to obtain low-molecular-weight amylose, but this method requires a large amount of enzyme preparations, and the cost is high

Method used

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preparation example Construction

[0024] The present invention provides a kind of preparation method of corn starch, comprising:

[0025] a) coarsely crushing the corn after soaking, and separating the germ to obtain coarse starch milk;

[0026] b) finely crushing the crude starch milk, separating protein and fiber to obtain starch milk;

[0027] c) adding an alkali solution to the starch milk to form a starch solution, and the temperature of the starch solution is 40°C to 60°C;

[0028] d) filtering the starch solution to obtain amylose and amylopectin.

[0029] The invention directly separates the amylose and the amylopectin during the preparation process of the corn starch without secondary processing of the corn starch, and has simple preparation technology and low cost.

[0030] Both amylose and amylopectin are high polymers of glucose, but they have different structures and properties: amylose is a glucose polymer linked only by α-1,4-glycosidic bonds, with a molecular weight of about 5 Ten thousand, ...

Embodiment 1

[0044] The late-maturing corn in the Northeast region with an amylose content of 29wt% was used as a raw material, and the harvested corn was air-dried with a moisture content of 12wt%.

[0045] Soak 10kg of corn in 20L of sulfurous acid with a mass concentration of 0.25%, soak for 50 hours at 50°C; put the soaked corn into a mixer for coarse grinding, and pass the slurry obtained after coarse grinding through a 40-mesh sieve to obtain coarse starch milk Throwing the coarse starch milk into a blender for fine grinding, and passing the slurry obtained after fine grinding through a 200-mesh sieve to obtain the starch milk;

[0046] Get 5kg starch milk, add 0.15kg mass concentration and be 5% sodium hydroxide solution, obtain starch solution, the temperature of starch solution is 45 ℃, and pH value is 10; Use the microporous membrane that pore diameter is 1.5 μm as filter membrane to carry out the first step. Once filtered, the filtrate is detected by a dual-wavelength method, wh...

Embodiment 2

[0050] The late-maturing corn in Northeast China with an amylose content of 29wt% was used as a raw material, and the harvested corn was air-dried with a moisture content of 14wt%.

[0051] Soak 10kg of corn in 20L of sulfurous acid with a mass concentration of 0.25%, soak for 50 hours at 50°C; put the soaked corn into a mixer for coarse grinding, and pass the slurry obtained after coarse grinding through a 40-mesh sieve to obtain coarse starch milk Throwing the coarse starch milk into a blender for fine grinding, and passing the slurry obtained after fine grinding through a 200-mesh sieve to obtain the starch milk;

[0052] Get 5kg starch milk, add 0.2kg mass concentration and be 5% sodium hydroxide solution, obtain starch solution, the temperature of starch solution is 50 ℃, and pH value is 12; Use the microporous membrane that pore diameter is 1.2 μm as filter membrane to carry out the first step. Once filtered, the filtrate is detected by a dual-wavelength method, wherein ...

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Abstract

The invention provides a method for preparing corn starch, which comprises the following steps of: a) soaking corn, coarsely crushing the corn, and separating germs to obtain coarse starch milk; b) finely crushing the coarse starch milk, and separating proteins and fibers to obtain starch milk; c) adding aqueous alkali into the starch milk to form starch solution with the temperature of between 40 and 60 DEG C; and d) filtering the starch solution to obtain amylose starch and amylopectin. In the method, after the corn starch milk is prepared by directly separating germs and proteins, the amylose starch and the amylopectin are filtered and separated by utilizing the different solution natures of the amylose starch and the amylopectin in hot water that the amylose starch is dissolved in the aqueous alkali and the amylopectin is insoluble. The amylose starch and the amylopectin are directly separated in the technological process of preparing the corn starch without secondary processing, so the method has the advantages of simple process and lower cost.

Description

technical field [0001] The invention relates to the technical field of starch processing, in particular to a method for preparing corn starch. Background technique [0002] Starch is a kind of natural macromolecule substance, which widely exists in crops such as corn, potato, and sweet potato. Corn starch has been widely used due to its rich fat, linoleic acid, vitamins and other nutrients. Among them, 90% of corn starch It is directly used in the field of food industry, and 10% of corn starch is used in other fields. [0003] Corn starch has good degradability and can be used as a degradable material directly or compounded with other substances to form a starch-based composite material. However, common corn starch contains 70wt%-90wt% amylopectin, which has low strength and poor film-forming performance, which seriously affects the performance of degradable materials formed directly or compounded with other substances. Amylose has the advantages of high strength, good mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B30/20C08B30/00C12S3/12
Inventor 侯哲生殷敬华
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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