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Demulsification method of emulsion formed by extracting rice oil with aqueous enzymatic method

A technology of emulsion and rice oil, which is applied in the direction of fat oil/fat production and fat production, can solve the problems of limited free oil, reduce the oil yield of oil, limit the development of oil extraction by aqueous enzymatic method, etc., and achieve the purpose of improving the demulsification rate, The effect of low energy consumption and simple operation

Pending Publication Date: 2019-06-21
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the free oil obtained by the initial separation is very limited, and most of the oil exists in the emulsified layer. Although mild enzymatic hydrolysis conditions are beneficial to preserve the natural active ingredients in the oil, a large amount of emulsion will be produced during oil extraction. Significantly reduces the oil yield of oil, thus limiting the development of aqueous enzymatic oil extraction

Method used

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  • Demulsification method of emulsion formed by extracting rice oil with aqueous enzymatic method
  • Demulsification method of emulsion formed by extracting rice oil with aqueous enzymatic method
  • Demulsification method of emulsion formed by extracting rice oil with aqueous enzymatic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Rice bran sample processing: crush the puffed rice bran and pass through a 40-mesh sieve to obtain rice bran powder;

[0034] (2) Enzymatic treatment: add deionized water to the rice bran powder obtained in step (1), adjust the ratio of material to liquid at 1:6 (weight of rice bran: weight of deionized water) to form a mixed solution, and raise the temperature of the mixed solution to 90°C Inactivate the enzyme for 15 min, then cool to room temperature. Use 2 mol / L HCL solution to adjust the pH of the rice bran mixture to 5.0, add 3% rice bran weight β-glucanase and plant extract enzyme, the ratio of the two is 1:2, and enzymatically hydrolyze for 2 hours at 50°C to obtain Primary rice bran hydrolyzate. Adjust the pH of the primary rice bran hydrolyzate to 9.0 with 2mol / L NaOH solution, and carry out alkaline extraction at 60°C for 10 minutes. Then use 2mol / L NaOH solution to continue to adjust the pH to 9.0, add Acalase 2.4L alkaline protease with 3% rice bran w...

Embodiment 2

[0037] (1) Rice bran sample processing: crush the puffed rice bran and pass through a 40-mesh sieve to obtain rice bran powder;

[0038] (2) Enzymatic treatment: add deionized water to the rice bran powder obtained in step (1), adjust the ratio of material to liquid at 1:8 (weight of rice bran: weight of deionized water) to form a mixed solution, and heat the mixed solution to 90°C Inactivate the enzyme for 15 min, then cool to room temperature. Use 2 mol / L HCL solution to adjust the pH of the rice bran mixture to 5.0, add 4% rice bran weight β-glucanase and plant extract enzyme, the ratio of the two is 1:3, and enzymatically hydrolyze for 3 hours at 50°C to obtain Primary rice bran hydrolyzate. The pH of the primary rice bran hydrolyzate was adjusted to 9.0 with 2mol / L NaOH solution, and the alkaline extraction was carried out at 60°C for 30min. Then use 2mol / L NaOH solution to continue to adjust the pH to 9.0, add Acalase 2.4L alkaline protease with 5% rice bran weight, an...

Embodiment 3

[0041] (1) Rice bran sample processing: crush the puffed rice bran and pass through a 40-mesh sieve to obtain rice bran powder;

[0042] (2) Enzymatic treatment: add deionized water to the rice bran powder obtained in step (1), adjust the ratio of material to liquid at 1:5 (weight of rice bran: weight of deionized water) to form a mixed solution, and heat the mixed solution to 90°C Inactivate the enzyme for 15 min, then cool to room temperature. Use 2mol / L HCL solution to adjust the pH of the rice bran mixture to 5.0, add 2% rice bran weight β-glucanase and plant extract enzyme, the ratio of the two is 1:1, and enzymatically hydrolyze for 1 hour at 50°C to obtain Primary rice bran hydrolyzate. The pH of the primary rice bran hydrolyzate was adjusted to 9.0 with 2mol / L NaOH solution, and the alkaline extraction was carried out at 60°C for 60min. Then use 2mol / L NaOH solution to continue to adjust the pH to 9.0, add Acalase2.4L alkaline protease with 2% rice bran weight, and e...

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Abstract

The invention discloses a demulsification method of an emulsion formed by extracting rice oil with an aqueous enzymatic method. After centrifugation of rice bran enzymolysate obtained after biologicalenzyme treatment, an emulsion layer, a hydrolysate layer and a residue layer can be obtained. The emulsion layer is taken, the pH is adjusted, and after centrifugation, free oil and a stubborn emulsion are obtained; a certain amount of calcium chloride solution is added into the stubborn emulsion, and after centrifugation, upper-layer oil is obtained; a mixture of the free oil obtained by twice demulsification is total crude rice bran oil. A pH adjusting method is carried out by changing the pH environment of an emulsion system to achieve the purposes of changing the structure and the chargeability of an interfacial film and further achieve effective demulsification. After initial demulsification and centrifugation, a part of stubborn emulsion still exists, and through addition of the calcium chloride solution destruction of a double-electric layer structure of protein, aggregation between oil droplets takes place to cause demulsification. When the demulsification method provided by the invention is used for performing demulsification treatment to the emulsion produced by extracting the rice oil with the aqueous enzymatic method, the demulsification rate can be effectively increased, and meanwhile, the content of oryzanol in the obtained crude rice bran oil is also significantly increased; the demulsification method has the advantages of low energy consumption, no pollution, environment friendliness, health, simple operation and the like.

Description

technical field [0001] The invention relates to a processing method for extracting rice oil by an aqueous enzymatic method, in particular to a process for extracting rice oil by an aqueous enzymatic method, by combining the pH adjustment method and the electrostatic shielding method to demulsify the emulsion, thereby improving the demulsification rate The method belongs to the field of food industry. Background technique [0002] my country is the largest rice producing country in the world. As an important by-product in rice processing, rice bran is mainly composed of exocarp, mesocarp, cross-linked layer, seed coat and aleurone layer. Rice bran is used as a raw material for rice oil extraction, and the mass fraction of oil is as high as 12-22%. Rice oil is an important new type of edible vegetable oil with high nutritional value. The mass fraction of oleic acid, linoleic acid and linolenic acid contained in it is as high as 80%, and the ratio of oleic acid to linoleic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/00C11B1/02
Inventor 张敏许朵霞王振华
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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