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Method for preparing corn oil from corn kernels

A corn oil and corn kernel technology, which is applied in the production of fat oil/fat, refining of fat oil/fat, and fat production, can solve the problem of increasing equipment investment cost, production cost and energy consumption, and the mastery of production technology affects the quality of corn oil and cannot be obtained. High-quality corn oil and other problems, to achieve the effect of omitting the embryo extraction process, solving the loss of oil content, and solving the problem of excessive storage time

Pending Publication Date: 2019-10-08
GUANGXI FORESTRY RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The freshness of corn germ is poor, and high-quality corn oil cannot be obtained
The main reason is that corn germ is a by-product of corn processing. The extracted germ needs to be accumulated for a period of time to reach a certain amount before it can be squeezed to make oil. If the corn germ is stored for too long, it will not only cause oil loss, but also be hydrolyzed by lipolytic enzymes. As a result, the lipids in the corn germ undergo hydrolysis and rancidity, resulting in a low oil yield. Therefore, the quality of the crude oil obtained is poor, the color of the corn oil becomes darker, the acid value increases, and it produces spicy and peculiar smells. It must be further refined before it can be eaten. , resulting in the loss of a lot of nutrients in corn oil, and the nutritional value is greatly reduced
In addition, when the moisture content of corn germ is high, mildew is easy to occur, and the moldy corn germ may contain aflatoxin, and the safety of the corn oil obtained from it is not guaranteed.
(2) The process route is long and the process is complicated. The quality of the production technology of each process link also directly affects the quality of corn oil, and at the same time increases the investment cost, production cost and energy consumption of equipment

Method used

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  • Method for preparing corn oil from corn kernels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The impurity-removed and screened plump whole corn kernels were roasted at a temperature of 75°C and a vacuum of -0.07MPa for 0.3h, then the temperature was controlled at 75°C and kept for 0.5h, and the moisture content of the whole corn kernels was 6%; vacuum roasting The fried whole corn kernels are squeezed under the conditions of the temperature of 75°C and the pressure of 30MPa; the squeezed oil juice is separated from the oil residue with a 200-mesh stainless steel screen, and the separated corn grits and corn kernels are separated by 1 : 10 mixed and then squeezed, the separated oil is heated to 70°C at a stirring speed of 60r / min, the vacuum degree is kept at -0.07MPa, and the heat is kept for 0.2h; the corn oil after vacuum heat treatment is cooled to 3°C, kept 2h, then carry out precision filtration with a 600-mesh filter cloth to obtain a corn oil product. The main technical indicators of the corn oil obtained are as follows:

[0032] Color: Y=28, R=4.7; aci...

Embodiment 2

[0034] The impurity-removed and screened plump whole corn kernels were roasted at a temperature of 70°C and a vacuum of -0.09MPa for 0.8h, then controlled at 75°C for 0.5h, and the moisture content of the whole corn kernels was 4%; vacuum roasting The fried whole corn kernels are squeezed under the conditions of the temperature of 65°C and the pressure of 50MPa; the squeezed oil juice is separated from the oil residue with a 100-mesh stainless steel screen, and the separated corn grits and corn kernels are separated by 1 : 5 and then squeezed, the separated oil was heated to 60°C at a stirring speed of 30r / min, the vacuum degree was kept at -0.09MPa, and kept for 0.4h; the corn oil after vacuum heat treatment was cooled to 2°C, kept 3h, and then finely filtered with a 600-mesh filter cloth to obtain a corn oil product. The main technical indicators of the corn oil obtained are as follows:

[0035] Color: Y=28, R=4.7; acid value (KOH, mg / g): 2.3; peroxide value (mg / kg): 4.2; a...

Embodiment 3

[0037] The impurity-removed and screened plump whole corn kernels were roasted at a temperature of 65°C and a vacuum of -0.07MPa for 0.3h, and then the temperature was controlled at 75°C and kept for 0.5h. The moisture content of the whole corn kernels was 7%; vacuum roasting The fried whole corn kernels are squeezed under the conditions of the temperature of 75°C and the pressure of 30MPa; the squeezed oil juice is separated from the oil residue with a 200-mesh stainless steel screen, and the separated corn grits and corn kernels are separated by 1 : 10 mixed and then squeezed, the separated oil was heated to 64°C at a stirring speed of 60r / min, the vacuum degree was kept at -0.07MPa, and kept for 0.2h; the corn oil after vacuum heat treatment was cooled to 3°C, kept 2h, then carry out precision filtration with a 600-mesh filter cloth to obtain a corn oil product. The main technical indicators of the corn oil obtained are as follows:

[0038] Color: Y=28, R=4.7; acid value (...

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Abstract

The invention discloses a method for preparing corn oil from corn kernels. The method comprises cleaning corn kernels as a raw material, screening and grading the raw material, roasting in vacuum, pressing, carrying out primary filtering, carrying out thermal treatment in vacuum, removing wax, carrying out fine filtration, and packaging to obtain corn oil. The process of roasting in vacuum is utilized herein, so that corn kernels with high quality can be attained; the corn kernels are subjected directly as a raw material to production of corn oil; the germ extraction process is omitted, so that investment and production cost are reduced; the corn oil is further dewatered and subjected to enzyme inactivation through the thermal treatment in vacuum, so that quality of the finished corn oil is improved.

Description

technical field [0001] The invention relates to the field of oil processing, in particular to a method for preparing corn oil from whole corn kernels. Background technique [0002] Corn oil is corn germ oil. It is an oil made from corn germ. It has a golden color and an aromatic smell. Corn oil is rich in unsaturated fatty acids necessary for the human body. The content of unsaturated fatty acids is more than 80%, mainly linoleic acid and oleic acid. Among them, linoleic acid accounts for more than 50% of the total amount of oil, and the content of oleic acid is about 30%. Corn oil is also rich in physiologically active substances such as phytosterols (content up to 1.1%) and vitamin E (content up to 0.99%), It has high nutritional value, and its absorption rate is as high as 97%. It is a recognized healthy edible oil at home and abroad. Its main functions are to lower human cholesterol, lower blood pressure, soften blood vessels, increase human muscle, heart, and cardiovasc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/04C11B1/06C11B3/00
CPCC11B1/04C11B1/06C11B3/001
Inventor 吴建文陆顺忠宋钢秦绪雄陈文瑶李秋庭黎贵卿关继华邱米杨素华韦宜宾汤星月党中广陆建坚唐宾
Owner GUANGXI FORESTRY RES INST
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