CN111387301A - Preparation method of plateau rapeseed oil suitable for children to eat - Google Patents
Preparation method of plateau rapeseed oil suitable for children to eat Download PDFInfo
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- CN111387301A CN111387301A CN202010319061.XA CN202010319061A CN111387301A CN 111387301 A CN111387301 A CN 111387301A CN 202010319061 A CN202010319061 A CN 202010319061A CN 111387301 A CN111387301 A CN 111387301A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 238000000199 molecular distillation Methods 0.000 claims abstract description 20
- 239000000944 linseed oil Substances 0.000 claims abstract description 16
- 235000021388 linseed oil Nutrition 0.000 claims abstract description 16
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- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 4
- ZIIUUSVHCHPIQD-UHFFFAOYSA-N 2,4,6-trimethyl-N-[3-(trifluoromethyl)phenyl]benzenesulfonamide Chemical compound CC1=CC(C)=CC(C)=C1S(=O)(=O)NC1=CC=CC(C(F)(F)F)=C1 ZIIUUSVHCHPIQD-UHFFFAOYSA-N 0.000 description 4
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- 235000021122 unsaturated fatty acids Nutrition 0.000 description 3
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 3
- YYGNTYWPHWGJRM-UHFFFAOYSA-N (6E,10E,14E,18E)-2,6,10,15,19,23-hexamethyltetracosa-2,6,10,14,18,22-hexaene Chemical compound CC(C)=CCCC(C)=CCCC(C)=CCCC=C(C)CCC=C(C)CCC=C(C)C YYGNTYWPHWGJRM-UHFFFAOYSA-N 0.000 description 2
- 229930182558 Sterol Natural products 0.000 description 2
- BHEOSNUKNHRBNM-UHFFFAOYSA-N Tetramethylsqualene Natural products CC(=C)C(C)CCC(=C)C(C)CCC(C)=CCCC=C(C)CCC(C)C(=C)CCC(C)C(C)=C BHEOSNUKNHRBNM-UHFFFAOYSA-N 0.000 description 2
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- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- PRAKJMSDJKAYCZ-UHFFFAOYSA-N dodecahydrosqualene Natural products CC(C)CCCC(C)CCCC(C)CCCCC(C)CCCC(C)CCCC(C)C PRAKJMSDJKAYCZ-UHFFFAOYSA-N 0.000 description 2
- 239000008157 edible vegetable oil Substances 0.000 description 2
- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 description 2
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- 229940031439 squalene Drugs 0.000 description 2
- TUHBEKDERLKLEC-UHFFFAOYSA-N squalene Natural products CC(=CCCC(=CCCC(=CCCC=C(/C)CCC=C(/C)CC=C(C)C)C)C)C TUHBEKDERLKLEC-UHFFFAOYSA-N 0.000 description 2
- 150000003432 sterols Chemical class 0.000 description 2
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- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 201000004624 Dermatitis Diseases 0.000 description 1
- 102100031415 Hepatic triacylglycerol lipase Human genes 0.000 description 1
- 108010013563 Lipoprotein Lipase Proteins 0.000 description 1
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- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 108010058864 Phospholipases A2 Proteins 0.000 description 1
- JAZBEHYOTPTENJ-JLNKQSITSA-N all-cis-5,8,11,14,17-icosapentaenoic acid Chemical compound CC\C=C/C\C=C/C\C=C/C\C=C/C\C=C/CCCC(O)=O JAZBEHYOTPTENJ-JLNKQSITSA-N 0.000 description 1
- 230000002917 arthritic effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000037208 balanced nutrition Effects 0.000 description 1
- 235000019046 balanced nutrition Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000975 bioactive effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 208000029078 coronary artery disease Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 230000002542 deteriorative effect Effects 0.000 description 1
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- 235000019621 digestibility Nutrition 0.000 description 1
- 229940090949 docosahexaenoic acid Drugs 0.000 description 1
- JAZBEHYOTPTENJ-UHFFFAOYSA-N eicosapentaenoic acid Natural products CCC=CCC=CCC=CCC=CCC=CCCCC(O)=O JAZBEHYOTPTENJ-UHFFFAOYSA-N 0.000 description 1
- 235000020673 eicosapentaenoic acid Nutrition 0.000 description 1
- 229960005135 eicosapentaenoic acid Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000004626 essential fatty acids Nutrition 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
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- 230000006698 induction Effects 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 235000020824 obesity Nutrition 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS, COOKING OILS
- A23D9/00—Other edible oils or fats, e.g. shortenings, cooking oils
- A23D9/02—Other edible oils or fats, e.g. shortenings, cooking oils characterised by the production or working-up
- A23D9/04—Working-up
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B1/00—Production of fats or fatty oils from raw materials
- C11B1/02—Pretreatment
- C11B1/04—Pretreatment of vegetable raw material
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B1/00—Production of fats or fatty oils from raw materials
- C11B1/06—Production of fats or fatty oils from raw materials by pressing
- C11B1/08—Production of fats or fatty oils from raw materials by pressing by hot pressing
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention discloses a preparation method of plateau rapeseed oil suitable for children to eat, which comprises the following steps: taking plateau rapeseed oil as a raw material, and adding 10-40 wt% of linseed oil; adding the prepared oil into compound lipase and water, carrying out enzymolysis reaction, and then carrying out purification and separation by three-stage molecular distillation; then adding 0.5-5 wt% of lysophospholipid DHA and 0.01-1 wt% of rosemary serving as a natural antioxidant, and uniformly stirring to obtain the rosemary extract. The rapeseed oil prepared by the method has the advantages that the flaxseed oil is added to adjust the fat proportion, so that the fatty acid of the rapeseed oil is more balanced; the fat is partially hydrolyzed by lipase, so that partial triglyceride is converted into diglyceride, the accumulation in the body is not generated when children eat the fat excessively, the problem of child obesity caused by the fat problem is avoided, meanwhile, the added lysophospholipid DHA plays an intelligence-improving role, and the lysophospholipid DHA is easier to be absorbed and utilized by the human body than ethyl ester type and triglyceride type DHA.
Description
Technical Field
The invention belongs to the technical field of edible oil processing, and particularly relates to a preparation method of plateau rapeseed oil which is suitable for children to eat and has health-care functions of balancing fatty acid, strengthening brain development and the like for the children.
Background
Rapeseed oil, abbreviated as "rape oil", is mainly taken from the seeds of cabbage-type rape and cabbage-type rape. The rapeseed oil has the unsaturated fatty acid content of more than 85 percent, contains rich oleic acid, linoleic acid, linolenic acid and phospholipid, has the digestibility of 99 percent to human bodies, and is rich in bioactive components such as vitamin E, polyphenol, squalene, sterol and the like. The unsaturated fatty acid has effects in regulating blood lipid, clearing away thrombi, regulating immunity, maintaining retina, nourishing brain, improving arthritic condition, and relieving pain.
Trans-fatty acid is a general term of all unsaturated fatty acids containing trans-double bonds, and can prevent grease from deteriorating, prolong the shelf life and improve the stability of food taste, but nutritional experts consider that trans-fatty acid is harmful to human health and mainly shows the defects of thrombosis, influence on development and fertility, reduction in memory, easiness in fatness and induction of coronary heart disease, so that the edible quality of rapeseed oil can be improved by extracting trans-fatty acid from the rapeseed oil.
At present, with the improvement of economic level, the health care consciousness of people is higher and higher, the nutrition structure of the traditional rapeseed oil is not rich enough, and the rapeseed oil can not provide sufficient nutrients for people due to single nutrient components after being eaten for a long time, has single effect and is particularly not suitable for children to eat for a long time. In view of the fact that rape oil is also the main edible oil in part of China, the invention provides plateau rape oil which has balanced nutrition and is suitable for children to eat.
Disclosure of Invention
The invention provides a preparation method of plateau rapeseed oil suitable for children to eat in order to solve the technical problems.
In order to solve the technical problem, the invention is realized by the following modes:
a preparation method of plateau rapeseed oil suitable for children comprises the following steps:
1) selecting plateau rapeseed oil in a weight percentage of 40-80% as base oil, adding linseed oil in a weight percentage of 10-40% into the plateau rapeseed oil, and mixing to ensure that the proportion of linoleic acid and α -linolenic acid in the mixed oil is less than 3: 1;
2) pumping the mixed oil prepared in the step 1) into an enzyme reaction tank, sequentially adding composite lipase and water, heating to 40-80 ℃ under normal pressure, reacting for 2-8 hours, and performing centrifugal dehydration and composite lipase after the reaction is finished;
3) distilling the substance subjected to centrifugal dehydration in the step 2) by using molecular distillation equipment, and further removing low-component substances such as glycerol, fatty acid and monoglyceride by using three-stage molecular distillation:
4) adding the substance purified by distillation in the step 3) into a storage tank, sequentially adding 0.5-5% by weight of lysophospholipid DHA and 0.01-1% by weight of rosemary serving as a natural antioxidant, and uniformly stirring in the storage tank to obtain the plateau rapeseed oil suitable for children.
Further, the specific preparation method of the plateau rapeseed oil in the step 1) comprises the following steps:
11) selecting raw materials: selecting original ecological plateau rapeseeds of a pasturing ecological circle with the size of more than 2600 meters from Sichuan sea;
12) removing impurities from raw materials: cleaning and impurity removing are carried out on the raw materials through a vibrating screen for later use;
13) drying raw materials: drying the rapeseed raw material cleaned and subjected to impurity removal in the step 12) by using continuous microwave drying equipment, wherein the drying temperature is controlled to be 100-105 ℃, and the rapeseed raw material is dried until the moisture content of the rapeseed raw material is lower than 6%;
14) peeling and separating: conveying the dried rapeseed raw material into a huller, and respectively adjusting the gap between a fast compression roller and a slow compression roller, the inclination angle of a separation screen and the height of each air door to ensure that the hull content in the rapeseed kernels is not more than 5 percent and the hull content in the kernels is not more than 4 percent;
15) low-temperature squeezing: pressing the peeled rapeseed raw material at normal temperature, wherein the pressing temperature is not more than 90 ℃, and the water content is 6%;
16) nitrogen sealing and sedimentation: pumping the squeezed plateau rapeseed oil into a settling tank, filling nitrogen with the pressure of 0.3MPa from the bottom of the settling tank, deoxidizing within 20-30 minutes, then keeping the nitrogen pressure in the settling tank at 0.05MPa, sealing with nitrogen, settling in the settling tank at natural temperature for 20-30 days, and separating oil residues at the lower layer to obtain the plateau rapeseed oil at the upper layer.
Preferably, the linseed oil produced in the step 1) is produced by a low-temperature mechanical pressing process, and the addition weight percentage is 10-40%, so that the ratio of linoleic acid to α -linolenic acid reaches 3:1, which is superior to 4:1 required by the nutritional science specified by the world health organization.
The weight percentage of the composite lipase added in the step 2) is 0.05-2%, and the weight percentage of the water added is 1-30%.
Compared with the prior art, the invention has the following beneficial effects:
the plateau rapeseed oil uses rapeseeds planted in a western Sichuan plateau area as a raw material, and is subjected to husking, mechanical low-temperature pressing and natural sedimentation filtering, so that the whole processing does not use high temperature, the degradation of the material due to high temperature is avoided to the greatest extent, the total sterol amount, vitamin E, squalene and polyphenol functional components in the rapeseed raw material are protected, and the functional components are not required to be refined by adopting low-temperature pressing, so that the loss of the functional components in the refining process is avoided.
The linseed oil contains α -linolenic acid 53%, α -linolenic acid is essential fatty acid for human body and can be converted into eicosapentaenoic acid and docosahexaenoic acid in human body, α -linolenic acid has the functions of resisting tumor, resisting thrombus, reducing blood fat, regulating vegetative nerve and the like, and the rosemary as a natural antioxidant has the functions of preventing oxidative rancidity of grease, resisting oxidation to human body, and preventing and treating xerophthalmia, nyctalopia, dermatitis and the like.
The plateau rapeseed oil prepared by the method has the advantages that the flaxseed oil is added to adjust the fat proportion, so that the fatty acid is more balanced; the fat is partially hydrolyzed by lipase, so that partial triglyceride is converted into diglyceride, and the fat is prevented from being accumulated in the body when children eat the fat excessively, thereby avoiding the problem of obesity of the children caused by the fat problem. Meanwhile, the added lysophospholipid DHA has the effect of improving intelligence, and the lysophospholipid DHA is easier to be absorbed and utilized by human bodies than ethyl ester DHA and triglyceride DHA.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to specific examples.
A preparation method of plateau rapeseed oil suitable for children comprises the following steps:
1) selecting plateau rapeseed oil in a weight percentage of 40-80% as base oil, adding linseed oil in a weight percentage of 10-40% into the plateau rapeseed oil, and mixing to ensure that the proportion of linoleic acid and α -linolenic acid in the mixed oil is less than 3: 1;
2) pumping the mixed oil prepared in the step 1) into an enzyme reaction tank, sequentially adding lipase, phospholipase and water, wherein the lipase is L ipozyme RM liquid enzyme, the phospholipase is phospholipase A1 and phospholipase A2, heating to 40-80 ℃ under normal pressure, reacting for 2-8 hours, and performing centrifugal dehydration and enzyme after the reaction is finished;
3) distilling the substance after centrifugal dehydration in the step 2) by molecular distillation equipment, removing low-component substances such as glycerol, fatty acid, monoglyceride and the like by utilizing three-stage molecular distillation, and obtaining the rest of needed diglyceride and triglyceride;
in the step, after the mixed oil prepared from the plateau rapeseed oil and the linseed oil is added into an enzyme reaction tank, substances obtained by reaction comprise low-component substances such as glycerol, fatty acid, monoglyceride and the like, and diglyceride and triglyceride, wherein the glycerol, the fatty acid and the monoglyceride are reaction byproducts, and the byproducts such as the glycerol, the fatty acid and the monoglyceride are removed by utilizing a molecular distillation technology to obtain the diglyceride and the triglyceride.
4) Adding the distilled and purified substance obtained in the step 3) into a storage tank, sequentially adding 0.5-5 wt% of lysophospholipid DHA and 0.01-1 wt% of rosemary serving as a natural antioxidant, and uniformly stirring in the storage tank to obtain the plateau rapeseed oil suitable for children to eat, wherein the lysophospholipid DHA is prepared by inoculating polyunsaturated fatty acid into phospholipid through reactions such as ester exchange and acidolysis of DHA and the phospholipid, and the phospholipid polyunsaturated fatty acid is easier to absorb and utilize by a human body compared with an ethyl ester type and a triglyceride type.
Further, the specific preparation method of the plateau rapeseed oil in the step 1) comprises the following steps:
11) selecting raw materials: selecting original ecological plateau rapeseeds of a pasturing ecological circle with the size of more than 2600 meters from Sichuan sea;
12) removing impurities from raw materials: cleaning and impurity removing are carried out on the raw materials through a vibrating screen for later use;
13) drying raw materials: drying the rapeseed raw material cleaned and subjected to impurity removal in the step 12) by using continuous microwave drying equipment, wherein the drying temperature is controlled to be 100-105 ℃, and the rapeseed raw material is dried until the moisture content of the rapeseed raw material is lower than 6%;
14) peeling and separating: conveying the dried rapeseed raw material into a huller, and respectively adjusting the gap between a fast compression roller and a slow compression roller, the inclination angle of a separation screen and the height of each air door to ensure that the hull content in the rapeseed kernels is not more than 5 percent and the hull content in the kernels is not more than 4 percent;
wherein the adjusting range of the press roll gap is 0-4 mm, and the adjusting range of the inclination angle of the separating screen is 5-10 degrees.
15) Low-temperature squeezing: pressing the peeled rapeseed raw material at normal temperature, wherein the pressing temperature is not more than 90 ℃, and the water content is 6%;
16) nitrogen sealing and sedimentation: pumping the squeezed plateau rapeseed oil into a settling tank, filling nitrogen with the pressure of 0.3MPa from the bottom of the settling tank, deoxidizing within 20-30 minutes, further ensuring that the blown nitrogen extrudes oxygen in air to protect grease, then keeping the nitrogen pressure in the settling tank at 0.05MPa for nitrogen sealing, settling in the settling tank for 20-30 days at natural temperature, and separating oil residues on the lower layer to obtain the plateau rapeseed oil on the upper layer.
Preferably, the linseed oil produced in the step 1) is produced by a low-temperature mechanical pressing process, and the addition weight percentage is 10-40%, so that the ratio of linoleic acid to α -linolenic acid reaches 3:1, which is superior to 4:1 required by the nutritional science specified by the world health organization.
The weight percentage of the added compound lipase (lipase, phospholipase) in the step 2) is 0.05-2%, and the weight percentage of the added water is 1-30%.
The conditions of the three-stage molecular distillation in the step 3) are respectively as follows: the primary molecular distillation temperature is 150-165 ℃, and the vacuum degree is 1.6-2.2 kPa; the temperature of the secondary molecular distillation is 185-195 ℃, and the vacuum degree is 75-85 Pa; the temperature of the three-stage molecular distillation is 215-220 ℃, and the vacuum degree is 10-15 Pa.
The first embodiment is as follows: the method comprises the steps of taking rapeseeds in plateau areas in western Sichuan as raw materials, cleaning and removing impurities through a vibrating screen, drying for 30 minutes at 100 ℃, cooling, then passing through a peeling machine, ensuring that the peel content of rapeseed kernels is not more than 5% and the peel content of the rapeseed kernels is not more than 4%, conveying the peeled rapeseeds to a screw press for oil pressing, controlling the temperature of a pressing frame to be 85-88 ℃ by controlling the feeding amount, blowing nitrogen gas with the pressure of 0.3MPa into a standing settling tank of the plateau rapeseeds for 25 minutes, and then standing for 20 days under the condition of nitrogen gas sealing.
According to the detection result of fatty acid of the plateau rapeseed oil and the linseed oil, the weight ratio of the plateau rapeseed oil to the linseed oil is measured according to the proportion of linoleic acid to α -linolenic acid 3:1, the weight ratio of the plateau rapeseed oil to the linseed oil is 64 percent and 36 percent, and the plateau rapeseed oil and the linseed oil are prepared according to the proportion and are conveyed to an enzyme reaction tank.
Simultaneously adding 0.1 percent by weight of lipase L ipozyme RM and phospholipase and 2 percent by weight of water, heating to 60 ℃ under normal pressure, stirring at 85r/min, reacting for 6.5 hours, and removing water and enzyme by a disk centrifuge after the reaction is finished.
Removing glycerin, fatty acid and monoglyceride by three-stage molecular distillation purification, wherein the first-stage molecular distillation conditions are respectively 160 ℃ and 2 kPa; the temperature of the secondary molecular distillation is 190 ℃, and the vacuum degree is 80 Pa; the temperature of the three-stage molecular distillation is 220 ℃, and the vacuum degree is 10 Pa.
Adding 4 weight percent of lysophospholipid DHA and 0.2 weight percent of rosemary serving as a natural antioxidant into the distilled and purified substance, and uniformly stirring the mixture in a storage tank to obtain the plateau rapeseed oil suitable for children to eat, wherein the ratio of linoleic acid to α -linolenic acid is detected to reach 2.8:1, and the content of diglyceride is 23.9%.
The foregoing is illustrative of embodiments of the present invention and it will be further appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention and that such modifications are intended to be included within the scope of the appended claims.
Claims (6)
1. A preparation method of plateau rapeseed oil suitable for children to eat is characterized by comprising the following steps: the method comprises the following steps:
1) selecting plateau rapeseed oil in a weight percentage of 40-80% as base oil, adding linseed oil in a weight percentage of 10-40% into the plateau rapeseed oil, and mixing to ensure that the proportion of linoleic acid and α -linolenic acid in the mixed oil is less than 3: 1;
2) pumping the mixed oil prepared in the step 1) into an enzyme reaction tank, sequentially adding composite lipase and water, heating to 40-80 ℃ under normal pressure, reacting for 2-8 hours, and performing centrifugal dehydration and composite lipase after the reaction is finished;
3) distilling the substance after centrifugal dehydration in the step 2) by molecular distillation equipment, and removing low-component substances such as glycerol, fatty acid and monoglyceride by utilizing three-stage molecular distillation;
4) adding the substance purified by distillation in the step 3) into a storage tank, sequentially adding 0.5-5% by weight of lysophospholipid DHA and 0.01-1% by weight of rosemary serving as a natural antioxidant, and uniformly stirring in the storage tank to obtain the plateau rapeseed oil suitable for children.
2. The preparation method of plateau rapeseed oil suitable for children to eat as claimed in claim 1, characterized by comprising: the specific preparation method of the plateau rapeseed oil in the step 1) comprises the following steps:
11) selecting raw materials: selecting original ecological plateau rapeseeds more than 2600 meters of Sichuan-West sea;
12) removing impurities from raw materials: cleaning and impurity removing are carried out on the raw materials through a vibrating screen for later use;
13) drying raw materials: drying the rapeseed raw material cleaned and subjected to impurity removal in the step 12) by using continuous microwave drying equipment, wherein the drying temperature is controlled to be 100-105 ℃, and the rapeseed raw material is dried until the moisture content of the rapeseed raw material is lower than 5%;
14) peeling and separating: conveying the dried rapeseed raw material into a huller, and respectively adjusting the gap between a fast compression roller and a slow compression roller, the inclination angle of a separation screen and the height of each air door to ensure that the hull content in the rapeseed kernels is not more than 5 percent and the hull content in the kernels is not more than 4 percent;
15) low-temperature squeezing: pressing the peeled rapeseed raw material at normal temperature, wherein the pressing temperature is not more than 90 ℃, and the water content is 6%;
16) nitrogen sealing and sedimentation: pumping the squeezed plateau rapeseed oil into a settling tank, filling nitrogen with the pressure of 0.3MPa from the bottom of the settling tank, deoxidizing within 20-30 minutes, then keeping the nitrogen pressure in the settling tank at 0.05MPa, sealing with nitrogen, settling in the settling tank at natural temperature for 20-30 days, and separating oil residues at the lower layer to obtain the plateau rapeseed oil at the upper layer.
3. The method for preparing plateau rapeseed oil suitable for children to eat as claimed in claim 1, wherein the linseed oil produced in step 1) is produced by a low-temperature mechanical pressing process, and the weight percentage of the added linseed oil is 10-40%, so that the ratio of linoleic acid to α -linolenic acid is 3: 1.
4. The preparation method of plateau rapeseed oil suitable for children to eat as claimed in claim 1, characterized by comprising: the weight percentage of the composite lipase added in the step 2) is 0.05-2%, and the weight percentage of the water added is 1-30%.
5. The preparation method of plateau rapeseed oil suitable for children to eat as claimed in claim 2, characterized by comprising: the adjusting range of the press roll gap in the step 14) is 0-4 mm, and the adjusting range of the inclination angle of the separating screen is 5-10 degrees.
6. The preparation method of plateau rapeseed oil suitable for children to eat as claimed in claim 1, characterized by comprising: the conditions of the three-stage molecular distillation in the step 3) are respectively as follows: the primary molecular distillation temperature is 150-165 ℃, and the vacuum degree is 1.6-2.2 kPa; the temperature of the secondary molecular distillation is 185-195 ℃, and the vacuum degree is 75-85 Pa; the temperature of the three-stage molecular distillation is 215-220 ℃, and the vacuum degree is 10-15 Pa.
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