CN-122012174-A - Low-temperature physical purification method of high-purity nutritional perilla seed oil

Abstract

The invention relates to the technical field of vegetable oil refining processing, and discloses a low-temperature physical purification method of high-purity nutritional perilla seed oil, which comprises the following steps of S1, freezing crude perilla seed oil subjected to impurity removal for 36-50 hours at a temperature of-30 ℃ to-20 ℃ to crystallize and separate out wax and free water in the oil; S2, sequentially filtering the frozen perilla seed oil by a precise filter material of 5 mu m, 1 mu m and 0.1 mu m at a low temperature, adopting the whole-course low-temperature physical purification, no heating, no chemical reagent and no adsorption decolorization, well retaining the nutritional ingredients such as alpha-linolenic acid, vitamin E and the like, generating no trans fatty acid, having higher nutrition and safety, thoroughly removing the impurities such as wax, moisture, phospholipid and the like by low-temperature crystallization, multistage precise filtration and cross-flow coupling of nanofiltration membranes, ensuring clear and stable oil product, difficult turbidity and deterioration, environment-friendly process, low cost and adapting to industrial production, and effectively solving the quality short plates of the traditional refining and the existing physical purification.

Inventors

• WANG DEHUI

Assignees

• 双鸭山红兴隆紫萱生物科技有限责任公司

Dates

Publication Date

20260512

Application Date

20260319

Claims (8)

1. 1. A low-temperature physical purification method of high-purity nutritional perilla seed oil is characterized by comprising the following steps: S1, freezing crude perilla seed oil subjected to impurity removal at a temperature of between 30 ℃ below zero and 20 ℃ below zero for 36 to 50 hours to crystallize and separate out wax and free water in the oil; S2, sequentially carrying out tertiary filtration on the frozen perilla seed oil under a low temperature state through precise filter materials of 5 mu m, 1 mu m and 0.1 mu m to remove crystalline wax and moisture, and filtering part of phospholipid and free fatty acid; s3, standing the filtered perilla seed oil for 10-14 hours at normal temperature; and S4, filtering the settled perilla seed oil through a nanofiltration membrane, and completely removing phospholipids and free fatty acids in the oil to obtain the high-purity perilla seed oil.
2. 2. The method for low-temperature physical purification of high-purity nutritive perilla seed oil according to claim 1, wherein the freezing temperature in S1 is-25 ℃ and the freezing time is 48 hours.
3. 3. The method for low-temperature physical purification of high-purity nutritive perilla seed oil according to claim 2, wherein in S2, the whole process of three-stage filtration is performed in a low-temperature environment of-25 ℃.
4. 4. The method for low-temperature physical purification of high-purity nutritive perilla seed oil according to claim 1, wherein the nanofiltration membrane has a molecular weight cut-off of 2000-3000 daltons.
5. 5. The method for low-temperature physical purification of high-purity nutritive perilla seed oil according to claim 1, wherein in S2, the precise filter material is a polytetrafluoroethylene folding filter element.
6. 6. The method for physically purifying high-purity nutritive perilla seed oil at low temperature according to claim 1, wherein the step S4 is followed by aseptic nitrogen filling of the purified perilla seed oil to obtain the finished high-purity nutritive perilla seed oil.
7. 7. The method for low-temperature physical purification of high-purity nutritive perilla seed oil according to claim 1, wherein the whole purification process is not heated, chemical reagents are not added, and adsorption decolorizer is not used.
8. 8. The method for physically purifying high-purity nutritive perilla seed oil at low temperature according to claim 1, wherein the filtration in S4 is cross-flow filtration to delay membrane pollution and improve filtration efficiency.

Description

Low-temperature physical purification method of high-purity nutritional perilla seed oil Technical Field The invention relates to the technical field of vegetable oil refining processing, in particular to a low-temperature physical purification method of high-purity nutritional perilla seed oil. Background The perilla seed oil is rich in polyunsaturated fatty acids such as alpha-linolenic acid and the like, and has extremely high nutrition and health care value. However, unsaturated fats are extremely easily oxidized and degraded under the action of high temperature and chemical agents due to the active acidity, so that the physiological activity of the unsaturated fats is reduced; At present, the traditional perilla seed oil refining mostly adopts a chemical refining process, phosphoric acid and sodium hydroxide are added for degumming and deacidification, and clay is utilized for high-temperature adsorption and decolorization, and the process can remove colloid, wax and free fatty acid in crude oil, but the high-temperature treatment and the use of chemical reagents can cause irreversible damage to the oil, so that a large amount of nutrients such as natural vitamin E, plant sterol and the like are lost, even trans-fatty acid is generated, and the natural quality of the perilla seed oil serving as high-end nutrition oil is seriously influenced; The existing physical refining methods can only realize simple filtration, and are difficult to thoroughly remove wax, moisture and colloid substances separated out by low-temperature crystallization on the premise of not heating and adding no chemical reagent, so that the finished oil is easy to generate turbidity or oxidative deterioration in storage, and the market demand of the high-purity and high-nutrition cold-pressed perilla seed oil cannot be met, so that a low-temperature physical purification method of the high-purity nutrition perilla seed oil is provided to solve the problems. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a low-temperature physical purification method of high-purity nutritional perilla seed oil, which solves the problems that the nutrition of the perilla seed oil is lost and trans-fatty acid is generated due to the high temperature and the addition of a reagent in the traditional chemical refining, the existing physical refining purification is not thorough, and the oil product is easy to become turbid, oxidized and deteriorated. The invention aims at realizing the purposes by adopting the following technical scheme that the low-temperature physical purification method of the high-purity nutritional perilla seed oil comprises the following steps: S1, freezing crude perilla seed oil subjected to impurity removal at a temperature of between 30 ℃ below zero and 20 ℃ below zero for 36 to 50 hours to crystallize and separate out wax and free water in the oil; S2, sequentially carrying out tertiary filtration on the frozen perilla seed oil under a low temperature state through precise filter materials of 5 mu m, 1 mu m and 0.1 mu m to remove crystalline wax and moisture, and filtering part of phospholipid and free fatty acid; s3, standing the filtered perilla seed oil for 10-14 hours at normal temperature; and S4, filtering the settled perilla seed oil through a nanofiltration membrane, and completely removing phospholipids and free fatty acids in the oil to obtain the high-purity perilla seed oil. Preferably, in S1, the freezing temperature is-25 ℃ and the freezing time is 48 hours. Preferably, in S2, the three-stage filtration is performed in a low temperature environment of-25 ℃. Preferably, the nanofiltration membrane has a molecular weight cut-off of 2000-3000 daltons. Preferably, in the step S2, the precision filter material is a polytetrafluoroethylene folded filter element. Preferably, the step S4 further comprises the step of carrying out aseptic nitrogen filling and filling on the purified perilla seed oil to obtain the finished product high-purity nutritional perilla seed oil. Preferably, the whole purification process is not heated, no chemical reagent is added, and no adsorption decolorizer is used. Preferably, the filtration in S4 adopts cross-flow filtration to delay membrane pollution and improve filtration efficiency. Advantageous effects The invention provides a low-temperature physical purification method of high-purity nutritional perilla seed oil. Compared with the prior art, the method has the following beneficial effects: The low-temperature physical purification method of the high-purity nutritional perilla seed oil adopts a whole-course low-temperature physical purification process, thoroughly abandons the traditional chemical refining and high-temperature treatment links, and furthest protects the natural nutrition and the physiological activity of the perilla seed oil. The purification process is not heated, does not add chemical reagents such as phosphoric acid, sodium hydr