CN110214956B

CN110214956B - Method for preparing food-grade corn fiber by corn soaking process

Info

Publication number: CN110214956B
Application number: CN201910617268.2A
Authority: CN
Inventors: 李荣杰; 刘天友; 宋家林; 纪传侠; 王宁
Original assignee: Anhui BBCA Fermentation Technology Engineering Research Co Ltd
Current assignee: Anhui BBCA Fermentation Technology Engineering Research Co Ltd
Priority date: 2019-04-19
Filing date: 2019-07-09
Publication date: 2022-03-08
Anticipated expiration: 2039-07-09
Also published as: CN109907329A; CN110214956A

Abstract

The invention relates to a method for preparing food-grade corn fiber by a corn soaking process, which adopts the mass concentration of 0.0Soaking corn in 1-5.0% organic acid water solution, and processing the soaked corn into corn fiber. The invention uses organic acid to replace SO in the traditional process₂The corn is soaked to achieve the soaking effect equivalent to that of the traditional soaking process, and all obtained products have no SO₂Remains without removing SO₂The treatment process is saved, and the environment is protected. The soaked corn can be directly processed into edible corn fiber. The corn fiber obtained by the invention can be used for extracting corn fiber oil, and can also be used for preparing high-dietary fiber corn germ meal, high-fiber corn flakes, dietary fiber milk beverages, functional health foods, food auxiliary additives, dietary fiber health-care yoghourt, dietary fiber cold drinks and the like.

Description

Method for preparing food-grade corn fiber by corn soaking process

Technical Field

The invention relates to the field of agricultural product processing, in particular to a method for preparing food-grade corn fiber by a corn soaking process.

Background

China is the second largest corn producing country in the world and the second largest consuming country in the world, and corn once limited to food and feed as main consumption is now greatly changed, and besides steadily increasing feed consumption, the corn deep processing industry develops rapidly in these years. Corn is the most suitable variety as an industrial raw material among the three major food crops, and is also the food crop with the highest processing degree. The corn processing industry is characterized by large processing space, long industrial chain and extremely rich products, including eight series of starch, starch sugar, modified starch, alcohol, enzyme preparation, seasoning, medicine, chemical industry and the like, but mainly comprising starch and alcohol, other products are more deep processed products or produced byproducts of the two products, and the deep processed products or the byproducts have quite high value, namely have higher added value, and can bring high profit.

At present, corn deep processing generally comprises a dry method and a wet method, wherein the wet deep processing is the main method adopted in many countries and regions. However, in the wet deep processing process, sulfurous acid is added, and SO generated by decomposition of sulfurous acid is added₂The pollution to the environment is great, and the health of people is seriously harmed. Not only that, because of the SO in the products obtained by their production₂The residue is high, the international food standard requirements cannot be met, and the product cannot be directly eaten, so that the obtained product needs to be subjected to subsequent desulfurization treatment, the process is complicated and complex, and the production cost is increased.

Therefore, there is a need to develop a soaking method that can reduce the amount of sulfurous acid used in the soaking process or directly does not use sulfurous acid, so as to be used for the deep processing production of corn.

Disclosure of Invention

The invention provides a green and environment-friendly corn deep processing method, which utilizes organic acid to replace SO in the traditional process₂The corn is soaked to achieve the soaking effect equivalent to that of the traditional soaking process, and all obtained products have no SO₂Residue, process saving and environmental protection.

In order to achieve the purpose of the invention, the invention particularly provides a method for preparing food-grade corn fiber by a corn soaking process, wherein the corn is soaked by adopting an organic acid aqueous solution with the mass concentration of 0.01-5.0%, and then the corn obtained by soaking is processed into the corn fiber.

The method provided by the invention realizes the damage to the corn protein net by using the organic acid with proper concentration, thereby achieving the purposes of releasing starch, separating protein and the like for soaking separation.

Specifically, the organic acid may be selected from malic acid, succinic acid, lactic acid, citric acid, acetic acid or fumaric acid, preferably malic acid or citric acid.

In order to improve the soaking effect on the premise of ensuring the corn quality, particularly improve the yield of the corn germ, food-grade corn fiber and other final products, the mass concentration of the organic acid aqueous solution is preferably 0.2-2.0%, more preferably 0.5-1.0%, and further preferably 0.8-1.0%.

In order to improve the soaking efficiency on the premise of ensuring the corn quality, the soaking is preferably carried out under the constant temperature condition of 30-75 ℃, more preferably under the constant temperature condition of 40-55 ℃, and further preferably under the constant temperature condition of 50 ℃. In the invention, the soaking is preferably carried out for 36-100 h in a closed environment, more preferably for 45-60 h in a closed environment, and further preferably for 48h in a closed environment.

As a preferred scheme of the present invention, the soaking specifically comprises: immersing the corn in a malic acid or citric acid aqueous solution with the mass concentration of 0.8-1.0%, and soaking for 45-55 h at the constant temperature of 45-55 ℃ in a closed environment.

In order to improve the quality of the final product, before said steeping, the corn may be subjected to a pre-treatment comprising the following steps: screening out the corns which do not go mouldy, removing impurities and then cleaning.

The corn fiber obtained by crushing and separating the soaked corn can be obtained by the method conventionally used in the field. The invention can adopt the following specific implementation modes: pouring the soaked corns into a wall breaking machine, adding about 225mL of water, and crushing to obtain corn slurry; placing the corn pulp into a 500mL beaker, taking out corn germs on the upper part of the corn pulp by using a strainer, stirring the corn pulp until the germs are suspended, fishing out the germs by using the strainer, repeating the operation until no germs exist in the pulp, obtaining crude fiber by using the degermed corn pulp through a fiber separation curved sieve, further crushing the crude fiber, washing the crude fiber for multiple times by using water, centrifugally separating, dehydrating and drying to obtain a corn fiber finished product.

The corn fiber prepared by the method can be used for extracting corn fiber oil, and can also be used for preparing high-dietary fiber corn germ meal, (instant) high-fiber corn flakes, dietary fiber milk beverage, functional health food, food auxiliary additives, dietary fiber health yogurt, dietary fiber cold drink and the like.

As a specific scheme of the invention, the method for preparing the food-grade corn fiber by the corn soaking process comprises the following specific steps:

(1) screening out corns which do not go mouldy, removing impurities and then cleaning;

(2) immersing the cleaned corn in an organic acid aqueous solution with the mass concentration of 0.05-5.0%, soaking for 36-100 h at the constant temperature of 30-75 ℃ in a closed environment, and separating to obtain the corn and a soaking solution;

(3) mixing the soaked corn with water, breaking the wall to obtain corn slurry, and removing corn germ from the corn slurry; separating the corn pulp from which the corn germs are removed to obtain crude fiber, and further crushing, separating and drying to obtain a corn fiber finished product.

(2) immersing the cleaned corn in a malic acid or citric acid aqueous solution with the mass concentration of 0.8-1.0%, and soaking for 45-55 h at the constant temperature of 45-55 ℃ in a sealed environment;

(2) immersing the cleaned corns in a malic acid or citric acid aqueous solution with the mass concentration of 1.0%, and soaking for 48 hours at the constant temperature of 50 ℃ in a sealed environment;

The method provided by the invention utilizes organic acid to replace SO in the traditional process₂The corn is soaked to achieve the soaking effect equivalent to that of the traditional soaking process, and the obtained products have no SO₂And residual corn, and the soaked corn can be directly processed to obtain food-grade corn fiber. The corn fiber obtained by the invention can be used for extracting corn fiber oil, and can also be used for preparing high-dietary fiber corn germ meal, high-fiber corn flakes, dietary fiber milk beverages, functional health foods, food auxiliary additives, dietary fiber health-care yoghourt, dietary fiber cold drinks and the like.

Detailed Description

The examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Example 1

The invention provides a method for preparing food-grade corn fiber by a corn soaking process, which comprises the following specific steps:

(1) screening out corns which do not mildew, removing impurities, weighing 100g of corns, placing the corns in a beaker, adding 100mL of tap water, shaking for about 2min, removing washing water after washing is finished, and repeatedly washing for 3 times according to the same method;

(2) transferring the cleaned corn into a 500mL ground bottle, immersing the corn into a 1.0% citric acid aqueous solution, soaking the corn for 48 hours in a sealed environment at a constant temperature of 50 ℃, filtering the corn by using filter paper, and separating the corn and the soak solution;

(3) pouring the corns obtained in the step (2) into a wall breaking machine, adding about 225mL of tap water, and crushing to obtain corn slurry; putting the corn slurry into a 500mL beaker, taking out corn germs on the upper part of the corn slurry by using a strainer, then stirring the corn slurry by using a glass rod until the germs are suspended, fishing out the germs by using the strainer, and repeating the operation until no germs exist in the slurry; and (3) subjecting the corn slurry without the germs to a fiber separation curved sieve to obtain crude fibers, further crushing, washing with water for multiple times, centrifugally separating, dehydrating and drying to obtain a corn fiber finished product.

The germ taken out in the step (3) is screened into a clean glass ware and baked in an oven at 105 ℃ for 5 hours, and the yield of the dried germ in the embodiment is calculated to be 3.91%.

The yield of corn fiber obtained in this example was calculated to be 16.14%.

The corn germ obtained by the invention is rich in unsaturated fatty acid, and can be directly eaten or sold as a nutritional food. The corn germ can also be used for squeezing corn germ oil, producing low-fat food, processing and producing corn germ chewable tablets, or extracting albumin thereof to prepare bionic beef, or being used as food auxiliary additives such as cakes, bread, desserts and the like, or being ground into germ powder, being used for preparing a preparation, or producing corn germ milk fermentation juice and various cereal beverages, or being used for producing bioactive corn peptide and gamma-aminobutyric acid food, or being used for producing corn germ antioxidant titanium tortoise jelly, corn antioxidant titanium oral liquid and the like.

The corn fiber obtained by the invention can be used for extracting corn fiber oil, and can also be used for preparing high-dietary fiber corn germ meal, (instant) high-fiber corn flakes, dietary fiber milk beverages, functional health foods, food auxiliary additives, dietary fiber health-care yoghourt, dietary fiber cold drinks and the like.

Example 2

Compared with example 1, the difference is only that: and replacing the citric acid aqueous solution with a malic acid aqueous solution with the mass concentration of 1.0%.

The yield of dried germ in this example was calculated to be 3.85%.

Example 3

Compared with example 1, the difference is only that: the citric acid aqueous solution was replaced with a lactic acid aqueous solution having a mass concentration of 1.0%.

The yield of dried germ in this example was calculated to be 3.77%.

Example 4

Compared with example 1, the difference is only that: the 1.0% citric acid aqueous solution was replaced with a 0.5% citric acid aqueous solution by mass.

The yield of dried germ in this example was calculated to be 3.28%.

Comparative example

Compared with example 1, the difference is only that: with 0.2% SO₂Instead of the aqueous citric acid solution.

The yield of dry germ in this comparative example was calculated to be 3.93% and the yield of corn fiber was calculated to be 10.54%.

The results show that the corn germ product yield obtained by soaking in the example 1 and the comparative example is not obviously different, but the yield of the corn fiber in the example 1 is obviously higher than that in the comparative example, and the product obtained in the example 1 is directly obtained into the food-grade corn fiber without a subsequent desulfurization step, so that the process is saved, and the product is safe.

Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A method for preparing food-grade corn fiber by a corn soaking process is characterized by soaking corn in a citric acid aqueous solution with the mass concentration of 0.8-1.0%, soaking for 45-55 hours at a constant temperature of 45-55 ℃ in a closed environment, and processing the soaked corn into corn fiber.

2. The method of claim 1, wherein prior to steeping, the corn is subjected to a pretreatment comprising the steps of: screening out the corns which do not go mouldy, removing impurities and then cleaning.

3. The method according to claim 1, wherein the processing is in particular: mixing the soaked corn with water, breaking the wall to obtain corn slurry, and removing corn germ from the corn slurry; separating the corn pulp from which the corn germs are removed to obtain crude fiber, and further crushing, separating and drying to obtain a corn fiber finished product.

4. The method of claim 1, comprising the steps of:

(2) immersing the cleaned corn in a citric acid aqueous solution with the mass concentration of 0.8-1.0%, soaking for 45-55 h at the constant temperature of 45-55 ℃ in a closed environment, and separating to obtain the corn and a soaking solution;