Rapeseed oil processing method
By using steam conditioning and air fryer pretreatment of rapeseed, the problem of nutrient loss during rapeseed oil processing has been solved, achieving efficient retention of functional lipids and increased oil yield. The operation is safe and simple.
Patent Information
- Application Number
- CN202511717547.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-02-06
AI Technical Summary
Existing rapeseed oil processing methods suffer from significant nutrient loss during pretreatment, especially low retention rates of functional lipids such as phenolic substances and phytosterols. Furthermore, traditional methods pose a risk of heat damage, making it difficult to achieve a balance between efficient oil extraction and high-value retention of nutrients.
The method of pre-treating rapeseed with steam conditioning and air fryer is adopted. Uniform heating is achieved by uniform humidification with high-temperature saturated steam and air frying. Combined with precise temperature control technology, the Maillard reaction is ensured to occur appropriately, avoiding heat damage.
It significantly increased the content of phytosterols by more than 12%, the total phenol content by more than 18%, and the oil yield by more than 2.67%. The operation is simple and safe, and it significantly improves the retention rate of functional lipids compared with traditional methods.
Smart Images
Figure CN121471970A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of rapeseed oil processing, and particularly relates to a rapeseed oil processing method. BACKGROUND
[0002] Rapeseed oil is one of the most important edible vegetable oils in China, and its consumption ranks first year after year. Its nutritional value is deeply concerned, especially the functional lipids such as phenolic substances (such as sinapinic acid derivatives) and phytosterols. These substances not only have excellent antioxidant activity, can significantly improve the oxidative stability of oil and fat, and prolong the shelf life, but also are confirmed to be beneficial to human health, such as phenolic substances and phytosterols have anti-inflammatory, potential reduce the risk of chronic diseases, and protect the cardiovascular function. Therefore, how to maximize the retention of these functional lipids in the processing process has become a key indicator to measure the quality of rapeseed oil.
[0003] The pretreatment of rapeseed is a key link before pressing, which directly affects the oil yield of rapeseed and the quality of pressed oil. However, the existing conventional pretreatment method has significant defects. The traditional frying or baking process usually adopts high temperature and long treatment time, although it can produce aroma, but uneven heating and high heat intensity can easily lead to a large amount of degradation and loss of nutrients, and may have an adverse color due to excessive Maillard reaction. Other methods such as microwave, radio frequency and pulsed electric field have deficiencies in the retention rate of active ingredients, equipment energy consumption and operation difficulty, and also have the risk of thermal damage, which is difficult to achieve an ideal balance between efficient oil production and high-value retention of nutritional ingredients. Therefore, it is of great significance to develop a new type of rapeseed pretreatment method to realize efficient retention of functional ingredients and simple and safe operation for the technical progress in the field. SUMMARY
[0004] In order to solve the problems mentioned in the background, the purpose of the present application is to provide a rapeseed oil processing method.
[0005] In order to achieve the above-mentioned target, the technical scheme of the present application is as follows: A rapeseed oil processing method, the steps are as follows: 1) Impurity removal and water adjustment of rapeseed: using a stainless steel porous screen to separate and remove impurities in the rapeseed and adjust the water content of the rapeseed, the water content of the rapeseed is adjusted to 5%-5.5%, after the adjustment is completed, it is placed at room temperature for 30-45 min, so that the water fully penetrates into the inside of the rapeseed cells, avoiding the shell from absorbing water suddenly in the subsequent steam conditioning, and then stored at 4℃ for 12h; 2) Steam conditioning of rapeseed: the rapeseed is sent into a conditioning tank at a flow rate, saturated steam at 55℃-60℃ is introduced, the conditioning time is 3min-5min, and the material is discharged immediately after the conditioning, so that the inside of the rapeseed is uniformly moisturized by high-temperature saturated steam; 3) Air fryer pretreatment of rapeseed: evenly spread the rapeseed in the pot, air fry at 160-190℃ for 5-20min, turn over the rapeseed during air frying to ensure uniform heating; 4) Cooling: cool the rapeseed to room temperature; 5) Pressing: adjust the moisture of the cooled rapeseed to 10%, use a temperature controllable oil press to press, collect the crude oil; 6) Centrifugation: centrifuge the pressed crude oil to obtain clear rapeseed oil product, detect the functional lipid content and the oil yield of the treated rapeseed.
[0006] Further, in step 2), the pressure is maintained at 0.1-0.12MPa.
[0007] Further, in step 3), the air fryer includes a lower shell, an upper shell, a drive motor, a pot, a transmission shaft, stirring blades, bevel gears, a bevel gear ring, an electric heating tube, a blowing motor and an impeller, the upper shell and the lower shell are detachably connected and form a closed shell, the top of the upper shell is provided with a plurality of air flow holes, the bottom of the lower shell is vertically installed with the drive motor, the center of the outer bottom plate of the pot is detachably connected with the main shaft of the drive motor, the transmission shaft transversely penetrates the side wall of the pot and is rotationally connected with the side wall of the pot, the bevel gears are connected on the transmission shaft outside the pot, the bevel gear ring is horizontally installed inside the lower shell, the bevel gears are engaged with the bevel gear ring, a plurality of connecting rods are fixedly connected on the transmission shaft inside the pot, the connecting rods are evenly distributed around the circumference of the transmission shaft, the stirring blades are fixedly connected on the connecting rods, the blowing motor and the electric heating tube are sequentially arranged inside the upper shell from top to bottom, and the impeller is connected on the main shaft of the blowing motor.
[0008] With the above scheme, the blowing motor and the electric heating tube cooperate to blow hot air into the pot, realizing air frying, during air frying, the pot can rotate, and in the process of rotation of the pot, the transmission shaft can drive a plurality of stirring blades to stir the rapeseed in the pot, realizing the effect of stir-frying.
[0009] Further, a partition is arranged inside the upper shell, the blowing motor and the electric heating tube are arranged on the upper and lower sides of the partition, a blowing port is arranged on the partition corresponding to the position of the impeller, a wind deflector is fixedly connected to the bottom of the partition, and the bottom edge of the wind deflector is gap-fitted with the top edge of the pot.
[0010] Further, the upper shell and the lower shell are hingedly connected together, and the movable ends of the upper shell and the lower shell are connected by magnets.
[0011] Further, the top of the main shaft of the driving motor is connected with a special-shaped shaft, the center of the outer bottom plate of the pot body is connected with a sleeve, and the special-shaped shaft is fitted and installed in the sleeve.
[0012] Further, the stirring blade is arc-shaped.
[0013] Further, in step 5), the working temperature of the temperature-controllable oil press is adjusted to 60 DEG C.
[0014] Further, in step 6), the centrifugal condition is that the centrifugal separation is performed at 12000 r / min for 5 min.
[0015] Further, in step 6), the functional lipids are total phenols and phytosterols.
[0016] The beneficial effects of the present application are that: the present application adopts steam conditioning and air fryer heating to pretreat rapeseed, the rapeseed after steam conditioning treatment can make the hot air in the air fryer rapidly penetrate the rapeseed, and the uniform heating of the rapeseed can be realized through the high-speed convection hot air in the air fryer, so that the Maillard reaction is moderately generated, the operation is safe and simple, and precise temperature control is realized, compared with traditional frying and microwave treatment methods, the phytosterol content is increased by more than 12% and 16% respectively; the total phenol content is increased by more than 18% and 59% respectively; the oil yield is increased by more than 2.67% and 5.95% respectively, and air frying significantly increases the content of total phenols and phytosterols in pressed rapeseed oil.
[0017] The beneficial effects of the present application are that: the present application adopts steam conditioning and air fryer heating to pretreat rapeseed, the rapeseed after steam conditioning treatment can make the hot air in the air fryer rapidly penetrate the rapeseed, and the uniform heating of the rapeseed can be realized through the high-speed convection hot air in the air fryer, so that the Maillard reaction is moderately generated, the operation is safe and simple, and precise temperature control is realized, compared with traditional frying and microwave treatment methods, the phytosterol content is increased by more than 12% and 16% respectively; the total phenol content is increased by more than 18% and 59% respectively; the oil yield is increased by more than 2.67% and 5.95% respectively, and air frying significantly increases the content of total phenols and phytosterols in pressed rapeseed oil. BRIEF DESCRIPTION OF DRAWINGS
[0018] Fig. 1 It is the axonometric view of the first orientation of the embodiment 1 of the present application. Fig. 2 It is the axonometric view of the second orientation of the embodiment 1 of the present application. Fig. 3 It is the sectional view of the embodiment 1 of the present application.
[0019] Figure number explanation: 1, lower shell, 11, fixed hinge ear, 12, lower mounting part, 13, lower magnet, 14, flange, 2, upper shell, 21, movable hinge ear, 22, upper mounting part, 23, upper magnet, 24, air flow hole, 3, driving motor, 4, pot body, 41, sleeve, 5, transmission shaft, 51, connecting rod, 52, stirring blade, 6, bevel gear, 7, bevel gear ring, 8, electric heating tube, 9, air supply motor, 91, impeller, 10, partition plate, 101, air supply port, 102, wind shield, 110, temperature sensor. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the protection scope of the present application.
[0021] Embodiment 1 An air fryer is provided, referring to Figs. 1-3The air fryer includes a lower shell 1, an upper shell 2, a drive motor 3, a pot body 4, a transmission shaft 5, a stirring blade 52, a bevel gear 6, a bevel gear ring 7, a heating element 8, a blower motor 9, and an impeller 91. Both the upper shell 2 and the lower shell 1 are cylindrical. The open ends of the upper shell 2 and the lower shell 1 are detachably connected to form a closed outer shell. Preferably, a movable hinge 21 is provided on one side of the bottom of the upper shell 2, and a fixed hinge 11 is provided on one side of the top of the upper shell 2. The movable hinge 21 is hinged to the fixed hinge 11 by a pin. An upper mounting part 22 and a lower mounting part 12 are respectively provided on the open ends of the upper shell 2 and the side away from the hinge ends. An upper magnet 23 is embedded in the mounting part 22, and a lower magnet 13 is embedded in the lower mounting part 12. When the upper shell 2 and the lower shell 1 are joined together, the upper magnet 23 and the lower magnet 13 are attracted together. A ring of airflow holes 24 is arranged around the top of the upper shell 2. A drive motor 3 is vertically mounted on the bottom of the lower shell 1. A sleeve 41 is fixed to the center of the outer bottom plate of the pot body 4. The inner hole of the sleeve 41 is an irregular hole. An irregular shaft is connected to the end of the main shaft of the drive motor 3. The irregular shaft is inserted into the irregular hole of the sleeve 41. The transmission shaft 5 passes through the side wall of the pot body 4 laterally. The rotating shaft is rotatably connected to the side wall of the pot body 4 through a ceramic bearing. A bevel gear 6 is connected to the transmission shaft 5 outside the pot body 4. A flange 14 is provided on the inner wall of the lower shell 1. A bevel gear ring 7 is fixed to the top of the flange 14. The bevel gear ring 7 is horizontally arranged, and a bevel gear 6 meshes with the bevel gear ring 7. Three connecting rods 51 are fixed to the drive shaft 5 inside the pot body 4. The three connecting rods 51 are evenly distributed around the circumference of the drive shaft 5. An arc-shaped stirring blade 52 is fixed to the end of the connecting rod 51. A blower motor 9 and an electric heating tube 8 are arranged sequentially from top to bottom inside the upper shell 2. The blower motor 9 is coaxial with the upper shell 2. An impeller 91 is connected to the main shaft of the blower motor 9. A partition 10 is provided inside the upper shell 2. The blower motor 9 and the electric heating tube 8 are respectively located on the upper and lower sides of the partition 10. An air outlet 101 is provided at the position corresponding to the impeller 91. A baffle 102 is fixedly connected to the bottom of the baffle 10. The bottom edge of the baffle 102 is clearance-fitted with the top edge of the pot body 4. A temperature sensor 110 is provided on the inner wall of the baffle 102. The drive motor 3, the air supply motor 9, the heating element 8, and the temperature sensor 110 are all communicatively connected to the control main board (not shown in the figure). The drive motor 3, the air supply motor 9, the heating element 8, and the temperature sensor 110 are also electrically connected to the power supply (not shown in the figure). The control main board is used to control the working time and speed of the drive motor 3 and the air supply motor 9. The control main board is also used to control the working time and working temperature of the heating element 8.
[0022] In practical applications, when processing rapeseed, the rapeseed is poured into the pot body 4, and then the pot body 4 is installed on the irregular shaft, so that the bevel gear 6 meshes with the bevel gear ring 7. Then the upper shell 2 is placed on the lower shell 1, and the blower motor 9, drive motor 3 and electric heating tube 8 are turned on. The blower motor 9 draws in air through some airflow holes 24. The drawn-in airflow is heated by the electric heating tube 8 and becomes hot air. The hot air is blown into the pot body 4. After the hot air touches the bottom, it will rise in the opposite direction and then be discharged through the remaining airflow holes 24, achieving hot air circulation in the pot body 4 and realizing air frying. During air frying, the drive motor 3 drives the pot body 4 to rotate. During the rotation of the pot body 4, the transmission shaft 5 can drive the three stirring blades 52 to stir the rapeseed in the pot body 4, achieving a stir-frying effect.
[0023] Example 2 A method for processing rapeseed oil, which involves steam conditioning and air frying, specifically includes the following steps: 3) Removal of impurities and moisture conditioning of rapeseed: Use a stainless steel fine-mesh sieve to separate and remove impurities from rapeseed and adjust the moisture content of rapeseed to 5%. After adjustment, let rapeseed stand at 25℃ for 30 minutes and then store it at 4℃ for 12 hours. 4) Rapeseed steam conditioning: Rapeseed is fed into the conditioning tank at a flow rate of 100 kg / h, 55℃ saturated steam is introduced, conditioning time is 5 min, pressure is maintained at 0.1 MPa, and the material is discharged immediately after conditioning. The rapeseed is uniformly moisturized inside by high temperature saturated steam. 3) Pre-treatment of rapeseed in air fryer: Spread the rapeseed, after adjusting the moisture content, evenly in the pot body 4, set the temperature to 190℃ and the time to 15min, and turn the rapeseed during air frying to ensure even heating. 4) Cooling: Cool the pretreated rapeseed to room temperature; 5) Pressing: Adjust the moisture content of the cooled rapeseed to 10%, store it at 4℃ for 12 hours, and press it using a temperature-controlled oil press. Set the oil press temperature to 60℃ and collect the crude oil. 6) Centrifugation: The pressed crude oil was centrifuged at 12000 r / min for 5 min to obtain a clear rapeseed oil product. The total phenol and phytosterol content was found to be 247.43 mg / 100g and 7174.39 mg / kg, respectively. The oil yield of rapeseed after air frying was 31.84%.
[0024] Example 3 A method for processing rapeseed oil, which involves steam conditioning and air frying, specifically includes the following steps: 1) Removal of impurities and moisture conditioning of rapeseed: Use a stainless steel fine-mesh sieve to separate and remove impurities from rapeseed and adjust the moisture content of rapeseed to 5.5%. After adjustment, let rapeseed stand at 25℃ for 45 minutes and then store it at 4℃ for 12 hours. 5) Rapeseed steam conditioning: Rapeseed is fed into the conditioning tank at a flow rate of 100 kg / h, 60℃ saturated steam is introduced, conditioning time is 3 min, pressure is maintained at 0.1 MPa, and the material is discharged immediately after conditioning. The rapeseed is uniformly moisturized inside by high temperature saturated steam. 3) Pre-treatment of rapeseed in air fryer: Spread the rapeseed that has been moistened evenly in the pot 4, set the temperature to 180℃ and the time to 15 minutes, and turn the rapeseed during air frying to ensure even heating. 4) Cooling: Cool the pretreated rapeseed to room temperature; 5) Pressing: Adjust the moisture content of the cooled rapeseed to 10%, store it at 4℃ for 12 hours, and press it using a temperature-controlled oil press. Set the oil press temperature to 60℃ and collect the crude oil. 6) Centrifugation: The pressed crude oil was centrifuged at 12000 r / min for 5 min to obtain a clear rapeseed oil product. The total phenol and phytosterol content was found to be 248.12 mg / 100g and 7176.04 mg / kg, respectively. The oil yield of rapeseed after air frying was 31.96%.
[0025] Comparative Example 1 A method for processing rapeseed oil, which involves pre-treating rapeseed by roasting, includes the following steps: (1) Removal of impurities and moisture conditioning of rapeseed: Use a stainless steel fine-mesh sieve to separate and remove impurities from rapeseed and adjust the moisture content of rapeseed to 6% and store at 4℃ for 12 hours; (2) Roasting rapeseed: Put the rapeseed that has been moistened into an automatic roasting machine, set the temperature to 150℃ and the time to 30min; (3) Cooling: Cool the pretreated rapeseed to room temperature; (4) Pressing: Adjust the moisture content of the cooled rapeseed to 10%, store it at 4℃ for 12 hours, and press it using a temperature-controlled oil press. Set the oil press temperature to 60℃ and collect the crude oil. (5) Centrifugation: The crude oil extracted was centrifuged at 12000r / min for 5min to obtain clear rapeseed oil product. The total phenol and phytosterol content was found to be 210.21mg / 100g and 6430.45mg / kg, respectively. The oil yield of rapeseed after roasting was 29.17%.
[0026] Comparative Example 2 A method for processing rapeseed oil, comprising microwave pretreatment of rapeseed, including the following steps: (1) Removal of impurities and moisture conditioning of rapeseed: Use a stainless steel fine-mesh sieve to separate and remove impurities from rapeseed and adjust the moisture content of rapeseed to 6% and store at 4℃ for 12 hours; (2) Microwave pretreatment of rapeseed: Place the rapeseed that has been moistened into a petri dish, set the microwave conditions to 800W, and the time to 7min; (3) Cooling: Cool the pretreated rapeseed to room temperature; (4) Pressing: Adjust the moisture content of the cooled rapeseed to 10%, store it at 4℃ for 12 hours, and press it using a temperature-controlled oil press. Set the oil press temperature to 60℃ and collect the crude oil. (5) Centrifugation: The crude oil extracted was centrifuged at 12000r / min for 5min to obtain clear rapeseed oil product. The total phenol and phytosterol content was found to be 155.48mg / 100g and 6161.67mg / kg, respectively. The rapeseed oil yield after microwave treatment was 25.89%.
[0027] Comparative Example 3 A rapeseed oil processing method that does not pre-treat rapeseed includes the following steps: (1) Removal of impurities and water conditioning of rapeseed: Use a stainless steel fine-mesh sieve to separate and remove impurities from rapeseed and adjust the moisture content of rapeseed to 10% and store at 4℃ for 12 hours; (2) Pressing: Store at 4℃ for 12 hours, then press using a temperature-controlled oil press. Set the oil press temperature to 60℃ and collect the crude oil. (3) Centrifugation: The crude oil extracted was centrifuged at 12000r / min for 5min to obtain clear rapeseed oil product. The total phenol and phytosterol content was found to be 64.17mg / 100g and 5961.37mg / kg, respectively. The oil yield of untreated rapeseed was 23.99%.
[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for processing rapeseed oil, characterized in that, The steps are as follows: 1) Removing impurities and adjusting moisture in rapeseed: Adjust the moisture content of rapeseed to 5%-5.5%, and after adjustment, let it stand at room temperature for 30-45 minutes, and then store it at 4℃ for 12 hours; 2) Rapeseed steam conditioning: The rapeseed is sent into the conditioning tank and saturated steam at 55℃-60℃ is introduced. The conditioning time is 3-5 minutes. The rapeseed is discharged immediately after conditioning. 3) Pre-treatment of rapeseed in air fryer: Spread the rapeseed evenly in the air fryer and air fry at 160℃-190℃ for 5min-20min. Turn the rapeseed during air frying to ensure that the rapeseed is heated evenly. 4) Cooling: Cool the rapeseed to room temperature; 5) Pressing: Adjust the moisture content of the cooled rapeseed to 10%, press it using a temperature-controlled oil press, and collect the crude oil; 6) Centrifugation: The crude oil extracted from pressing is centrifuged to obtain a clear rapeseed oil product. The content of functional lipids and the oil yield of rapeseed after processing are then tested.
2. The rapeseed oil processing method according to claim 1, characterized in that, In step 2), the pressure is maintained at 0.1MPa-0.12MPa.
3. The rapeseed oil processing method according to claim 1, characterized in that, In step 3), the air fryer includes a lower shell, an upper shell, a drive motor, a pot body, a transmission shaft, a stirring blade, a bevel gear, a bevel gear ring, an electric heating element, a blower motor, and an impeller. The upper shell and the lower shell are detachably connected to form a closed shell. The top of the upper shell is provided with several airflow holes. The drive motor is vertically installed at the bottom of the lower shell. The center of the outer bottom plate of the pot body is detachably connected to the main shaft of the drive motor. The transmission shaft passes horizontally through the side wall of the pot body and is rotatably connected to the side wall of the pot body. The bevel gear is connected to the transmission shaft outside the pot body. The bevel gear ring is horizontally installed inside the lower shell. The bevel gear meshes with the bevel gear ring. Several connecting rods are fixedly connected to the transmission shaft inside the pot body. The several connecting rods are evenly distributed around the circumference of the transmission shaft. The stirring blade is fixedly connected to the connecting rod. The blower motor and the electric heating element are arranged sequentially from top to bottom inside the upper shell. The impeller is connected to the main shaft of the blower motor.
4. The rapeseed oil processing method according to claim 3, characterized in that, The upper shell is provided with a partition, the blower motor and the heating element are respectively located on the upper and lower sides of the partition, the partition is provided with an air outlet corresponding to the position of the impeller, and a baffle is fixed to the bottom of the partition, the bottom edge of the baffle is clearance-fitted with the top edge of the pot body.
5. A rapeseed oil processing method according to claim 3, characterized in that, The upper housing and the lower housing are hinged together, and the movable ends of the upper housing and the lower housing are connected by magnets.
6. The rapeseed oil processing method according to claim 3, characterized in that, The top of the main shaft of the drive motor is connected to a shaped shaft, and the center of the outer bottom plate of the pot body is connected to a sleeve, with the shaped shaft fitted inside the sleeve.
7. A rapeseed oil processing method according to claim 3, characterized in that, The stirring blades are arc-shaped.
8. A rapeseed oil processing method according to claim 1, characterized in that, In step 5), the operating temperature of the temperature-controlled oil press is adjusted to 60℃.
9. A rapeseed oil processing method according to claim 1, characterized in that, In step 6), the centrifugation conditions are: centrifugation at 12000 r / min for 5 min.
10. A method for processing rapeseed oil according to claim 1, characterized in that, In step 6), the functional lipids are total phenols and phytosterols.