CN111171951A - Preparation method of walnut oil for pregnant women and infants - Google Patents
Preparation method of walnut oil for pregnant women and infants Download PDFInfo
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- CN111171951A CN111171951A CN202010027226.6A CN202010027226A CN111171951A CN 111171951 A CN111171951 A CN 111171951A CN 202010027226 A CN202010027226 A CN 202010027226A CN 111171951 A CN111171951 A CN 111171951A
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Images
Classifications
-
- 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
-
- 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
- C11B3/001—Refining fats or fatty oils by a combination of two or more of the means hereafter
Abstract
A preparation method of walnut oil for pregnant women and infants comprises the steps of selecting materials, taking kernels, peeling, drying, cold pressing, hydrating, dewatering, storing or canning and the like. The invention has the beneficial effects that: the production process is simple, the investment cost is low, the energy consumption is low, the environment is protected, the produced walnut cake meal can be recycled, the oxidation degree of the grease in the prepared walnut oil is low, the loss of the functional components in the grease is low, no artificial additive is used, the residue of acid, alkali and heavy metal is effectively avoided, the national standard is met, and the walnut oil is suitable for pregnant women and infants.
Description
Technical Field
The invention relates to the field of walnut oil preparation, and particularly relates to a preparation method of walnut oil for pregnant women and infants.
Background
the linoleic acid belongs to omega-6 type polyunsaturated fatty acid, which can not be synthesized by human body and must be absorbed from food, and has the functions of promoting skin development, maintaining body nutrition and health and being beneficial to hair moistening.
In the metabolic process of a human body, if the intake of omega-6 polyunsaturated fatty acid is insufficient, breeding defects, growth retardation, scaly skin and the like can be caused; if the intake of omega-3 polyunsaturated fatty acids is insufficient, visual impairment, visual acuity deterioration and learning ability deterioration will result. Meanwhile, scientific research proves that the proper omega-6/omega-3 intake ratio has the effects of promoting the normal growth and development of infants, improving intelligence and vision and adjusting the immune system of the organism. At present, the intake ratio of omega-6/omega-3 of the oil and fat in countries and organizations in Europe and America is recommended to be 4-6: 1, and the recommended value of our country is also in the range. Researches find that in the naturally produced grease, only the proportion of linoleic acid and linolenic acid in the walnut oil meets the requirement. Therefore, the walnut oil which is safe, free of pollution, rich in nutrition and mellow in taste is provided, so that the fatty acid can be ingested by infants and pregnant and lying-in women in a reasonable proportion, the nutritional requirements of the growth and development of the infants are met, and the walnut oil is very important.
At present, various methods can be used for extracting walnut oil, and mainly comprise a squeezing method (cold pressing and hot pressing), an organic solvent extraction method, a water extraction method, an aqueous enzymatic method and a supercritical extraction method. The cold pressing method is to extract the oil from the un-roasted oil material at a pressing temperature of not higher than 65 ℃, the method can ensure the quality of the oil and retain natural functional components in the oil, but the obtained oil lacks the fragrance of walnut nuts. The hot pressing method is to extract grease after the materials are baked and fried, the walnut oil obtained by the method has enough fragrance, but has the defects of complicated refining process, serious grease oxidation, large loss of functional components and the like. The organic solvent leaching method is to extract oil by utilizing the principle of similarity and intermiscibility among substances, and the oil has residual solvent and is not good for human health when being eaten. The water substitution method is to separate grease by utilizing the characteristic that water and oil are not mutually soluble, and the method is easy to be polluted by microorganisms in the oil preparation process. The aqueous enzymatic method is implemented by mechanical crushing and enzymolysisThe method for extracting the oil has the defect that the enzyme preparation is expensive. Supercritical CO2The extraction method is carried out under supercritical state with CO2The method has the advantages of high oil yield, good oil quality and no need of refining for extracting the oil by the mobile phase, but the method is restricted by aspects of energy consumption cost, technical equipment, safety and the like, and cannot be applied to medium-sized and small-sized enterprises.
The existing walnut oil refining process comprises the working procedures of degumming, deacidification, decoloration, water washing, deodorization and the like, and has the following defects: 1. the process is complicated, the refining efficiency is low, and partial functional components are lost after refining; 2. in the refining process, a large amount of acid, alkali and water are consumed, so that not only is resource consumption and environmental pollution caused, but also acid, alkali and heavy metal residues are caused, and the edible flavor is not good for human health; 3. the deodorization needs high temperature of more than 200 ℃, and functional components in the oil are damaged, so that nutrients are lost.
Disclosure of Invention
The invention aims to provide a preparation method of walnut oil for pregnant women and infants, which has the advantages of simple production process, low investment cost, low energy consumption, environmental protection, low oxidation degree of the prepared walnut oil, low loss of oil-soluble functional components, mellow taste, no artificial additive, effective avoidance of acid, alkali and heavy metal residues, accordance with the national standard and suitability for pregnant women and infants.
The object of the invention is achieved by a solution,
a preparation method of walnut oil for pregnant women and infants comprises the following steps:
s1, selecting: selecting wild walnuts without impurities, mildew, peculiar smell and clean shell surfaces as raw walnuts, and inspecting the water content, acid value and peroxide value of the raw walnuts, wherein the standard of reaching standards is as follows: the water content is less than or equal to 8.0 percent, the acid value (mgKOH/g) is less than or equal to 0.5, and the peroxide value (mmol/kg) is less than or equal to 0.5;
s2, taking kernels: using a special shell breaking machine to break shells of wild walnuts, and selecting walnut kernels which are not mildewed, full in particles and normal in color for later use;
s3, peeling: using 2-3 times of NaCO by weight3After walnut kernels are soaked in the solution for 8-10 min, washing the walnut kernels for 2-3 times by using clear water with the weight being 3-4 times that of the walnut kernels, and thus obtaining peeled walnut kernels;
s4, drying: drying the peeled walnut kernels by using an oven until the water content is 5-15 percent;
s5, cold pressing: the dried walnut kernels are uniformly and continuously sent into a hydraulic cold squeezer to be squeezed twice, and squeezed crude oil is centrifuged by a centrifuge to obtain initial walnut oil;
s6, hydration: immediately placing the virgin walnut oil into a hydration tank, keeping the oil temperature at 18-25 ℃, slowly adding salt water with the weight of 5% -6% of that of the oil, stirring for 10-20 min at the speed of 40-60 r/min, stirring for 5-15 min at the speed of 15-25 r/min after the salt water is added, standing for 24-48 h, sequentially adding walnut oil, colloid and water into the solution from top to bottom, removing the colloid and the water, and repeating the step for 1-2 times to obtain the degummed walnut oil;
s7, water removal: and (3) putting the degummed walnut oil into a water removal tank, heating to ensure that the temperature of the oil is raised to 50-60 ℃, maintaining the pressure at 0.01-0.03 MPa, and removing water for 24-48 hours to obtain the finished walnut oil.
Further, after step S7, the method further includes the following steps:
s8, storage: filling a storage barrel with food-grade nitrogen, adding the finished walnut oil into the storage barrel, and maintaining the oil temperature at 10-16 ℃ for filling; the finished walnut oil is pumped into a storage barrel, and the use of nitrogen ensures the purity and the nutrient content of the walnut oil and prolongs the shelf life of the walnut oil.
S9, canning: filtering the walnut oil by using a 300-400-mesh sieve, filling the walnut oil into a low-air-permeability glass bottle, and filling nitrogen for sealing; after the walnut oil is sieved, the walnut oil is further screened and purified, the low-permeability glass bottle can reduce the permeation of air outside the bottle, and the components of the walnut oil are further preserved by nitrogen-filled sealing. The label can be labeled after early sealing for recording date or filling corresponding parameters, so that later searching and use are facilitated.
The invention has simple production process, low heating temperature, less heating times and less required energy consumption in the whole oil preparation process; the vacuum low-temperature hydration method is adopted, so that the oxidation of the grease and the damage degree of functional components in the grease can be reduced; compared with the prior refining technology, the processes of phosphoric acid degumming, alkali refining deacidification, decoloration deodorization and the like are not needed, the residues of acid, alkali and heavy metal are effectively avoided, the nature of the grease is ensured, and meanwhile, the environment-friendly effect is achieved; compared with the prior storage technology, the method prolongs the shelf life and avoids adding artificial antioxidant, thus being more suitable for pregnant and lying-in women to eat.
In the preparation method of the walnut oil for pregnant women and infants, the wild walnuts are selected, are natural fruits growing in mountain forests, and have fragrant and delicious taste and lingering aftertaste; the oil produced by the wild walnut kernel is more exquisite, purely natural, pollution-free and rich in nutrition. The Chinese herbal medicine has very high medicinal functions of clearing hair, nourishing face, and preventing liver cancer by being matched with the honey; it can be used for relieving headache, hyperlipidemia, and thrombosis. In step S1, the limitation that the water content is less than or equal to 8.0% is beneficial to the storage of walnuts, the limitation that the acid value (mgKOH/g) is less than or equal to 0.5 and the peroxide value (mmol/kg) is less than or equal to 0.5 can ensure the freshness of the raw materials and the content of nutrient substances in the oil, and improve the quality of the obtained oil. In the step S2, the special shell breaking machine can ensure that the shell breaking efficiency is improved, simultaneously avoid the mixing of other substances and ensure the purity of the walnut oil, and the shell breaking machine preferably adopts a patent application number ZL201610540485.2 and is named as a crusher used in a method for breaking natural wild walnut and separating kernel and shell. The walnut kernel is coated with a thin skin with different colors, contains a large amount of phenolic substances, and can cause the walnut kernel oil to have a deepened color and luster, and unpleasant bitter and astringent feeling and astringency feeling and the like. Therefore, in order to ensure the quality and flavor of walnut products, peeling is needed, and a plurality of peeling methods are adopted, wherein in the step S3, an alkaline method with good effect and high efficiency is used for peeling, the time for soaking walnut kernels is specifically limited to 8-10 min, when the time for soaking walnut kernels in alkaline liquor exceeds 10min, the quality loss of peach kernels can be caused, and when the time for soaking in alkaline liquor is less than 8min, the peeling effect is poor. The step S6 uses hydration degumming, the salt water degumming has low cost, good degumming effect and no harm to human body, and in addition, the salt water can lead fine particles in the oil to absorb water and gather, so that the filtered oil can be clearer. In step S7, the oil temperature is raised to 50-60 ℃, the pressure is maintained at 0.01-0.03 MPa, the water is removed for 24-48 hours, and the selection of the proper temperature, vacuum degree and water removal duration can reduce the oxidation of the oil, protect the functional components in the oil from being damaged to the maximum extent, and ensure the water removal effect.
Further, NaCO in step S33The mass fraction of the solution is 1-3%, and the temperature is 50-60 ℃. When the mass fraction of the alkali liquor is higher than 3%, the peach kernel mass loss can be caused, and when the mass fraction of the alkali liquor is lower than 1%, the peeling effect can be deteriorated; similarly, when the soaking temperature is low, the peeling time is long, the peeling effect is poor, the soaking temperature is too high, the residual quantity of alkali liquor is increased, and the water consumption for cleaning is increased. In the present invention, only NaCO is used3When the mass fraction of the solution is 1-3%, the temperature is 50-60 ℃ and the soaking time is 8-10 min, the best peeling effect is realized in a short time, and the up-and-down floating of the three parameters is convenient for an operator to adjust the parameters during peeling. In step S5, the solid impurities in the cold pressed oil can be removed by centrifugation in a centrifuge. The cold-pressed walnut oil is immediately hydrated after centrifugal impurity removal, so that the nutritional ingredients in the walnut oil are protected to the maximum extent.
Further, the drying temperature in step S4 is 50 ℃ to 60 ℃. The drying temperature is lower than 50 ℃, so that the lipase activity is enhanced, the acid value of the oil is increased, and the quality is poorer; and the drying temperature is higher than 60 ℃, so that the loss of functional components in oil is serious, and the drying causes that the over-low and over-high water content is not beneficial to cake formation and oil production in the oil pressing process. The preferred drying temperature is 52 ℃ to 58 ℃, the more preferred drying temperature is 54 ℃ to 56 ℃, and the most preferred drying temperature is 55 ℃.
Further, in the step S5, the squeezing temperature is 50-60 ℃, and the pressure is 45-55 MPa. The temperature is selected as the drying temperature, and the corresponding pressure capable of better realizing the squeezing effect in the range is selected to be 45-55 MPa, the two have a synergistic effect, the more preferable pressure is selected to be 48-52 MPa, and the most preferable pressure is selected to be 50 MPa.
Further, in the step S6, the mass fraction of the saline is 5-10%, the temperature of the saline is 5-15 ℃ higher than that of the walnut oil, and the pressure of the hydration tank is 0.01-0.03 MPa. The mass fraction of the brine is preferably 6-9%, more preferably 7-8%, and most preferably 7.5%; the temperature of the brine is 5-15 ℃ higher than that of the walnut oil, so that the hydration process can be accelerated, the hydration effect is ensured, and the brine is preferably 8-12 ℃ higher than that of the walnut oil, more preferably 9-11 ℃, and most preferably 10 ℃; the pressure of the hydration tank is 0.01-0.03 Mpa, and the oxygen content is very low in the state, so that the oxidation of the grease can be reduced, and functional components in the grease can be protected from being damaged to the maximum extent; the hydration effect achieved by the three parameters is far better than the hydration effect achieved by changing any one parameter to be out of the range.
Due to the adoption of the technical scheme, the invention has the following advantages: the production process is simple, the investment cost is low, the energy consumption is low, the environment is protected, the oxidation degree of the prepared walnut oil and the loss degree of functional components are low, no artificial additive is used, the residue of acid, alkali and heavy metal is effectively avoided, the national standard is met, and the walnut oil and fat composite food is suitable for pregnant women and infants.
Drawings
Fig. 1 is a schematic flow chart of a preparation method of walnut oil for pregnant women and infants.
Fig. 2 is another schematic flow chart of the preparation method of walnut oil for pregnant women and infants.
Detailed Description
The invention will be further described with reference to the accompanying drawings 1 to 2 and examples.
Example 1
A preparation method of walnut oil for pregnant women and infants comprises the following steps:
s1, selecting: selecting wild walnuts without impurities, mildew, peculiar smell and clean shell surfaces as raw walnuts, and inspecting the water content, acid value and peroxide value of the raw walnuts, wherein the standard of reaching standards is as follows: the water content is less than or equal to 8.0 percent, the acid value (mgKOH/g) is less than or equal to 0.5, and the peroxide value (mmol/kg) is less than or equal to 0.5;
s2, taking kernels: breaking the walnut shells by using a special shell breaking machine, and selecting walnut kernels which are not mildewed, full in particles and normal in color for later use;
s3, peeling: using 2-3 times of NaCO by weight3After walnut kernels are soaked in the solution for 8-10 min, washing the walnut kernels for 2-3 times by using clear water with the weight being 3-4 times that of the walnut kernels, and thus obtaining peeled walnut kernels; wherein, NaCO3The mass fraction of the solution is 1-3%, and the temperature is 50-60 ℃;
s4, drying: drying the peeled walnut kernels by using an oven until the water content is 5-15%, and drying at the temperature of 50-60 ℃;
s5, cold pressing: the dried walnut kernels are uniformly and continuously sent into a hydraulic cold squeezer to be squeezed twice, and squeezed crude oil is centrifuged by a centrifuge to obtain initial walnut oil; wherein the squeezing temperature is 50-60 ℃, and the pressure is 45-55 MPa.
S6, hydration: pumping the virgin walnut oil into a hydration tank, keeping the oil temperature at 18-25 ℃, slowly adding salt water with the weight of 5% -6% of that of the oil, stirring at the speed of 40-60 r/min for 10-20 min, after the salt water is completely added, stirring at the speed of 15-25 r/min for 5-15 min, standing for 24-48 h, sequentially adding walnut oil, colloid and water into the solution from top to bottom, removing the colloid and the water, and repeating the step for 1-2 times to obtain the degummed walnut oil; wherein the mass fraction of the brine is 5-10%, the temperature of the brine is 5-15 ℃ higher than that of the walnut oil, and the pressure of a hydration tank is 0.01-0.03 MPa.
S7, water removal: and (3) putting the degummed walnut oil into a water removal tank, heating to ensure that the temperature of the oil is raised to 50-60 ℃, maintaining the pressure at 0.01-0.03 MPa, and removing water for 24-48 hours to obtain the finished walnut oil.
Example 2
A preparation method of walnut oil for pregnant women and infants comprises the following steps:
s1, selecting: selecting wild walnuts without impurities, mildew, peculiar smell and clean shell surfaces as raw walnuts, and inspecting the water content, acid value and peroxide value of the raw walnuts, wherein the standard of reaching standards is as follows: the water content is less than or equal to 8.0 percent, the acid value (mgKOH/g) is less than or equal to 0.5, and the peroxide value (mmol/kg) is less than or equal to 0.5;
s2, taking kernels: breaking the walnut shells by using a special shell breaking machine, and selecting walnut kernels which are not mildewed, full in particles and normal in color for later use;
s3, peeling: using 2-3 times of NaCO by weight3After walnut kernels are soaked in the solution for 8-10 min, washing the walnut kernels for 2-3 times by using clear water with the weight being 3-4 times that of the walnut kernels, and thus obtaining peeled walnut kernels; wherein, NaCO3The mass fraction of the solution is 2 percent, and the temperature is 55 ℃;
s4, drying: drying the peeled walnut kernels by using an oven until the water content is 5-15% and the drying temperature is 54-56 ℃;
s5, cold pressing: the dried walnut kernels are uniformly and continuously sent into a hydraulic cold squeezer to be squeezed twice, and squeezed crude oil is centrifuged by a centrifuge to obtain initial walnut oil; wherein the squeezing temperature is 50-60 ℃, and the pressure is 45-55 MPa.
S6, hydration: pumping the virgin walnut oil into a hydration tank, keeping the oil temperature at 18-25 ℃, slowly adding salt water with the weight of 5% -6% of that of the oil, stirring at the speed of 40-60 r/min for 10-20 min, after the salt water is completely added, stirring at the speed of 15-25 r/min for 5-15 min, standing for 24-48 h, sequentially adding walnut oil, colloid and water into the solution from top to bottom, removing the colloid and the water, and repeating the step for 1-2 times to obtain the degummed walnut oil; wherein the mass fraction of the brine is 5-10%, the temperature of the brine is 5-15 ℃ higher than that of the walnut oil, and the pressure of a hydration tank is 0.01-0.03 MPa.
S7, water removal: placing the degummed walnut oil into a water removing tank, heating to ensure that the temperature of the oil is raised to 50-60 ℃, maintaining the pressure at 0.01-0.03 MPa, and removing water for 24-48 hours to obtain finished walnut oil;
s8, storage: filling a storage barrel with food-grade nitrogen, adding the finished walnut oil into the storage barrel, and maintaining the oil temperature at 4 ℃ for filling;
s9, canning: and filtering the walnut oil by using a 300-400-mesh sieve, filling the walnut oil into a low-air-permeability glass bottle, and filling nitrogen for sealing.
Through detection, the wild walnut oil produced by the method can reach the following indexes:
| item | Standard requirements | Test results |
| Color and luster (Lovibond colorimetric tank 25.4mm) | Yellow is less than or equal to 29, red is less than or equal to 3.9 | Yellow 26, Red 1.9 |
| Transparency | Clear, transparent (with slight turbidity) | Clear and transparent |
| Impurities | No foreign matter visible in normal vision | No foreign matter visible in normal vision |
| Smell and taste | Has the inherent taste and smell of the product | Has the inherent taste and smell of the product |
| Insoluble impurities (g/100g) | ≤0.04 | 0.02 |
| Acid value (mg/g) | ≤2.9 | 1.4 |
| Peroxide number (mmol/kg) | ≤5.9 | 3.0 |
| Lead (in terms of lead) (mg/kg) | ≤0.09 | 0.079 |
| Total arsenic (As) (mg/kg) | ≤0.09 | Not detected out |
| Iron (mg/kg) | ≤5.0 | Not detected out |
| Copper (mg/kg) | ≤0.4 | Not detected out |
| Residual amount of solvent (mg/kg) | ≤90 | Not detected out |
| Oleic acid C18:1(g/100g) | 11.5～25.0 | 18.1 |
| Linoleic acid C18:2(g/100g) | 50.0～69.0 | 64.4 |
| Linolenic acid C18:3(g/100g) | 6.5～18.0 | 13 |
As can be seen from the above table, the inspection results all meet the standard requirements, the ratio of linoleic acid to linolenic acid is about 5:1, the value is within the range of national recommended value of 4-6: 1, and the acid value and the peroxide value are far more strict than the standard requirements. The walnut oil prepared by the method has low oxidation degree of oil and fat, low loss of functional components in the oil, effectively avoids the residues of acid, alkali and heavy metal, meets the national standard, and is suitable for pregnant women and infants.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, corresponding improvements and extended applications can be made without departing from the present invention, and these improvements and extended applications should also be considered as the protection scope of the present invention.
Claims (9)
1. The preparation method of walnut oil for pregnant women and infants is characterized by comprising the following steps:
s1, selecting: selecting walnuts without impurities, mildew, peculiar smell and clean shell surfaces as raw walnuts, and inspecting the water content, acid value and peroxide value of the raw walnuts, wherein the standard of reaching standards is as follows: the water content is less than or equal to 8.0 percent, the acid value (mgKOH/g) is less than or equal to 0.5, and the peroxide value (mmol/kg) is less than or equal to 0.5;
s2, taking kernels: breaking the walnut shells by using a special shell breaking machine, and selecting walnut kernels which are not mildewed, full in particles and normal in color for later use;
s3, peeling: using 2-3 times of Na2CO3After walnut kernels are soaked in the solution for 8-10 min, washing the walnut kernels for 2-3 times by using clear water with the weight being 3-4 times that of the walnut kernels, and thus obtaining peeled walnut kernels;
s4, drying: drying the peeled walnut kernels by using an oven until the water content is 5-15 percent;
s5, cold pressing: the dried walnut kernels are uniformly and continuously sent into a hydraulic cold squeezer to be squeezed twice, and squeezed crude oil is centrifuged by a centrifuge to obtain initial walnut oil;
s6, hydration: immediately placing the virgin walnut oil into a hydration tank, keeping the oil temperature at 18-25 ℃, slowly adding salt water with the weight of 5% -6% of that of the oil, stirring for 10-20 min at the speed of 40-60 r/min, stirring for 5-15 min at the speed of 15-25 r/min after the salt water is added, standing for 24-48 h, sequentially adding walnut oil, colloid and water into the solution from top to bottom, removing the colloid and the water, and repeating the step for 1-2 times to obtain the degummed walnut oil;
s7, water removal: and (3) putting the degummed walnut oil into a water removal tank, heating to ensure that the temperature of the oil is raised to 50-60 ℃, the pressure is maintained at 0.01-0.03 MPa, and removing water for 24-48 hours to obtain the finished walnut oil.
2. The method for preparing walnut oil for pregnant women and infants according to claim 1, further comprising the following steps after step S7:
s8, storage: filling a storage barrel with food-grade nitrogen, adding the finished walnut oil into the storage barrel, and maintaining the oil temperature at 10-16 ℃ for filling;
s9, canning: and filtering the walnut oil by using a 300-400-mesh sieve, filling the walnut oil into a low-air-permeability glass bottle, and filling nitrogen for sealing.
3. The method for preparing walnut oil for pregnant women and infants according to claim 1 or 2, wherein Na is added in step S32The mass fraction of the CO3 solution is 1-3%, and the temperature is 50-60 ℃.
4. The method for preparing walnut oil for pregnant women and infants according to claim 1 or 2, wherein the drying temperature in step S4 is 50 ℃ to 60 ℃.
5. The method for preparing walnut oil for pregnant women and infants according to claim 3, wherein the drying temperature in step S4 is 50 ℃ to 60 ℃.
6. The method for preparing walnut oil for pregnant women and infants according to claim 1, 2 or 5, wherein the pressing temperature in step S5 is 50-60 ℃, and the pressure is 45-55 MPa.
7. The method for preparing walnut oil for pregnant women and infants according to claim 3, wherein in step S5, the pressing temperature is 50-60 ℃, and the pressure is 45-55 MPa.
8. The method for preparing walnut oil for pregnant women and infants according to claim 4, wherein in step S5, the pressing temperature is 50-60 ℃, and the pressure is 45-55 MPa.
9. The preparation method of walnut oil for pregnant women and infants according to claim 1, 2, 5, 7 or 8, wherein the mass fraction of saline water in the step S6 is 5-10%, the temperature of the saline water is 5-15 ℃ higher than that of the walnut oil, and the pressure of a hydration tank is 0.01-0.03 MPa.
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