Method for Preparing Rapeseed Oil by Semi-solid Aqueous Enzymatic Treatment

• US 20180258369A1
• Filed: 05/15/2018
• Published: 09/13/2018
• Est. Priority Date: 11/25/2015
• Status: Active Grant

• Current Assignee: Jiangnan University
• Original Assignee: Jiangnan University
• Inventors: Liu, Yuanfa, Cao, Peirang, Li, Jinwei, Zhang, Liang
• Granted Patent: US 10,640,728 B2
• Time in Patent Office: Days
• CPC Class Codes: A23D 9/04 Working-up
• CPC Class Codes: A23K 20/158 Fatty acids; Fats; Products containing oils or fats
• CPC Class Codes: A23K 50/50 for rodents
• CPC Class Codes: A23L 33/115 Fatty acids or derivatives thereof; Fats or oils
• CPC Class Codes: A23V 2002/00 Food compositions, function of food ingredients or processes for food or foodstuffs
• CPC Class Codes: A61K 2236/00 Isolation or extraction methods of medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicine
• CPC Class Codes: A61K 36/31 Brassicaceae or Cruciferae (Mustard family), e.g. broccoli, cabbage or kohlrabi
• CPC Class Codes: C11B 1/025 by enzymes or microorganisms, living or dead
• CPC Class Codes: C11B 1/04 of vegetable raw material C11B1/025 takes precedence
• CPC Class Codes: C11B 1/06 by pressing
• CPC Class Codes: C12Y 302/01004 Cellulase (3.2.1.4), i.e. endo-1,4-beta-glucanase
• CPC Class Codes: C12Y 302/01015 Polygalacturonase (3.2.1.15)
• CPC Class Codes: C12Y 304/25001 Proteasome endopeptidase complex (3.4.25.1)

Abstract

The invention discloses a method for preparing rapeseed oil by a semi-solid aqueous enzymatic process, belonging to the field of functional foods and health care products. The present invention first prepares a semi-solid rapeseed paste with 3.5-4.5% moisture content, which is hydrolyzed by a mixture of pectinase, cellulase and alkaline protease to extract rapeseed oil. The resulting rapeseed oil contains high levels of active ingredients including totaxin, sterol, phenols and beta-carotene. The rapeseed oil of the invention can be added into animal feeds, which helps to reduce animal blood lipid levels and body weight. It can significantly reduce the contents of total triglyceride, total cholesterol and LDC-C in the blood, and, at the same time, increases the level of HDL-C in the blood. In addition, the rapeseed oil prepared by the present invention can relieve hepatic steatosis in hyperlipemia rats.

Claims

1. A method for producing rapeseed oil by a semi-solid aqueous enzymatic process, comprising the steps of:

1) cleaning rapeseeds to remove the debris, shriveled seeds, and impurities;

2) adjusting the moisture content of the rapeseeds to 8-10 wt %;

3) pressing the rapeseeds obtained in step

     2) to obtain rapeseed embryo flakes which are treated at 50°

C.-70°

C. to adjust the moisture content to be 3.5-4.5 wt %, and mature rapeseed flakes are thus obtained;

4) crushing the mature rapeseed flakes and sieve the crushed rapeseeds to obtain an oil-producing powder;

5) mixing the oil-producing powder and water at a mass ratio of 1;

1 to make a semi-solid rapeseed paste;

6) adding 0.5% to 2% (w/w) of the total enzyme (pectinase;

cellulase;

alkaline protease=1;

1;

1, by weight) to the semi-solid rapeseed paste, and stirring and mixing at 40-60°

C. for 1-2 hr;

7) centrifuging the rapeseed paste of step

     6) to separate crude oil from solid residues;

8) adding water to the crude oil at 0.2-0.4 L/kg oil, and centrifuging the oil-water mixture at 40-60°

C. to obtain a clear rapeseed oil; and

9) drying the clear rapeseed oil under vacuum to obtain final rapeseed oil product.

2. The method of claim 1, wherein, in the step 6), the mixing temperature is under gradient control by the following steps:

keeping the temperature at 40°

C. for 20-40 min, raising it to 60°

C. within 20-40 min, and maintaining it at 60°

C. for 20-40 min.

3. The method of claim 1, wherein the mature rapeseed flakes were sieved through 40˜

80 mesh sieve in step

     4).

4. The method of claim 1, wherein the stirring speed in step 6) is 10˜

20 rpm.

5. The method of claim 1, wherein, in step 6), the centrifugation speed used to separate the crude oil and the solid residues is 3500 rpm.

6. The method of claim 1, wherein, in step 7), the centrifugation speed used to separate the clear oil from water is 6500 rpm.

7. The method of claim 1, wherein the mature rapeseed flakes were sieved through a 40˜

80 mesh sieve in step

     4);

wherein the stirring speed in step

     6) is 10˜

20 rpm and the centrifugation speed used to separate the crude oil and the solid residues is 3500 rpm; and

wherein the centrifugation speed used to separate the clear oil from water is 6500 rpm in step

     7).

8. A rapeseed oil that is produced by the method of claim 1.