Method and device for extracting oat alkaloids with skin care effect

Abstract

The present invention discloses a method and device for extracting oat alkaloids with skin care effects. The method comprises: adding clean and dry oat grains to an acidic aqueous solution for soaking; then using a high-speed rotating blade to crush the oat grains in the acidic aqueous solution to form an oat slurry, wherein the crushing is performed in three stages; subjecting the oat slurry to microfluidics-ultrasonic extraction to obtain an extraction mixture; then filtering the extraction mixture to obtain an extraction supernatant; and vacuum concentrating the extraction supernatant to obtain oat alkaloid powder. By extracting alkaloids from oats using the method, the comprehensive extraction rate of oat alkaloids A, B, and C can be improved, so that the extract has a high content of all three alkaloids.

Description

Technical Field

[0001] The present invention relates to the technical field of oat alkaloid extraction, and in particular to a method and device for extracting oat alkaloids with skin care effects. Background Art

[0002] Oats are rich in natural antioxidants and have excellent skincare benefits. Avena alkaloids A, B, and C are the three main alkaloids in oat alkaloids. While the skincare benefits of these three alkaloids alone are limited, their combined effectiveness is superior. Prior art, patent publication number "CN112755133A" describes a method for extracting oat alkaloids. The method involves quick-freezing oat bran with liquid nitrogen and then pulverizing it to obtain oat bran powder. The oat bran powder is then vacuum-packed and subjected to ultrahigh pressure treatment at room temperature to obtain pretreated oat bran powder. The pretreated oat bran powder is then subjected to two microwave extractions using ethanol, water, and glacial acetic acid as solvents. Finally, the powder is spray-dried to obtain the avenant alkaloids.

[0003] In the above-mentioned patent, the oats need to be crushed, which is generally done by grinding. In addition, the oats are subjected to high-pressure treatment and microwave extraction. During microwave extraction, the oats will be heated rapidly.

[0004] However, a study by DIMBERG LH, SUNNERHEIM K, SUNDBERG B, et al. Stability of oatavenanthramides[J]. Cereal Chemistry, 2001, 78(3): 278-281 showed that avenant alkaloid A was not affected by pH; avenant alkaloid B was easily degraded at neutral and alkaline pH; and avenant alkaloid C was almost completely degraded at neutral pH and under heat treatment. Therefore, the microwave extraction method used in the above patent causes the oats to heat rapidly, which will significantly reduce the content of avenant alkaloid C.

[0005] Furthermore, a study by BRYNGELSSON S, DIMBERG LH, ELDIN A K. Effects of commercial processing on levels of antioxidants in oats[J]. Journal of Agricultural and Food Chemistry, 2002, 50(7): 1890-1896 showed that the content of avenant alkaloid A decreased after oat kernels were steamed and extruded, and the contents of avenant alkaloids A, B, and C decreased significantly after high-pressure and drum drying. Therefore, the above-mentioned patent states that crushing oats by crushing can reduce the content of avenant alkaloid A in the extract; and high-pressure treatment of oats can greatly reduce the contents of avenant alkaloids A, B, and C in the extract.

[0006] In summary, among the oat alkaloids extracted by the above method, the comprehensive extraction rate of oat alkaloids A, B, and C is not high, which reduces the skin care effect. Summary of the Invention

[0007] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a method and device for extracting oat alkaloids with skin care effects.

[0008] In order to achieve the above technical effects, the present invention adopts the following scheme:

[0009] A method for extracting oat alkaloids with skin care effects comprises the following steps:

[0010] S1. Add clean and dry oat grains to an acidic aqueous solution with a pH value of 3.5-5 and soak for 2-3 hours;

[0011] S2. Crushing oat grains into oat slurry in an acidic aqueous solution using high-speed rotating blades. The crushing is carried out in three stages: the first stage: the blade speed is 15,000-20,000 r / min, the crushing time is 25-30 minutes, and then the oat slurry is allowed to stand for 15-20 minutes; the second stage: the blade speed is 25,000-30,000 r / min, the crushing time is 15-20 minutes, and then the oat slurry is allowed to stand for 10 minutes; the third stage: the blade speed is 35,000-50,000 r / min, and the crushing time is 10-15 minutes;

[0012] S3. Subjecting the oat slurry to microfluidization-ultrasonic extraction to obtain an extraction mixture, wherein the flow rate of the microjet is 5-30 m / s and the ultrasonic power is 500-700 W;

[0013] S4, filtering the extraction mixture to obtain an extraction supernatant;

[0014] S5. The extracted supernatant is concentrated under vacuum to obtain oat alkaloid powder at a vacuum degree of 25-30 KPa, and heated in a water bath at a water bath temperature of 25-30°C.

[0015] According to a preferred technical solution, in step S1, the material-liquid ratio of oat grains to acidic aqueous solution is 1:7 to 1:10.

[0016] In a preferred technical solution, the acidic aqueous solution is an HCl solution.

[0017] The preferred technical solution is that in step S4, the residue obtained by the first filtration is mixed with an acidic aqueous solution at a solid-liquid ratio of 1:5, and then microfluidization-ultrasonic extraction is performed again, and then filtered. The extraction is repeated at least twice, and the extracted supernatants obtained by multiple filtrations are mixed.

[0018] An extraction device for oat alkaloids with skin care effects, comprising a crushing part, an extraction part, a filtering part and a vacuum concentration part connected in sequence;

[0019] The crushing part includes a crushing tank, a feeding hopper is provided on the side wall of the crushing tank and is connected to the crushing tank, a crushing knife assembly is provided in the crushing tank, a discharge port is provided at the lower end of the crushing tank, a valve is provided at the discharge port, and a feed pipe is connected to the discharge port;

[0020] The extraction part includes an extraction tank, which is connected to the first feeding pipe. The lower end of the extraction tank is provided with a second discharge port, the second discharge port is provided with a second valve, the second discharge port is connected to the second feeding pipe, and the extraction tank is provided with a micro jet component and an ultrasonic generator;

[0021] The filter portion includes a filter tank, the upper end of the filter tank is provided with a top cover, the top cover is detachably connected to the filter tank through a flange, the second feed pipe is connected to the top cover, the lower end of the filter tank is provided with a third discharge port, the third discharge port is provided with a third valve, the third discharge port is connected to the third feed pipe, a detachable filter basket is provided in the filter tank, the lower end of the filter basket is provided with a filter membrane, and the outer wall of the filter basket is provided with at least one sealing ring attached to the inner wall of the filter tank;

[0022] The vacuum concentration section includes a concentration tank, the upper end flange of the concentration tank is connected to a detachable upper cover, the upper cover is provided with an evaporation port, the evaporation port is connected to a condensation component, the feed pipe three is connected to the upper cover, the concentration tank is also connected to a vacuum generating component, and the lower end of the concentration tank is connected to a water bath heating component.

[0023] The preferred technical solution is that the crushing knife assembly includes a motor, a planetary gear set, a rotating rod and a blade, the planetary gear set is located in the crushing tank, the planetary gear set includes a horizontally arranged ring gear, the ring gear is fixedly mounted on the inner wall of the crushing tank, a sun gear is provided at the center of the ring gear, and the sun gear is driven to rotate by a motor installed at the top of the crushing tank, at least two planetary gears are evenly distributed around the sun gear at equal angles, at least two planetary gears are meshed between the ring gear and the sun gear, and the centers of at least two planetary gears are fixedly connected to a vertically arranged rotating rod, a number of blades are mounted on the rotating rod, and a number of blades on different rotating rods are staggered; at least two groups of stabilizing structures are below the ring gear, the stabilizing structure includes a connecting frame, the connecting frame is mounted on the inner wall of the crushing tank and rotates horizontally, and the rotating rod passes through the connecting frame and is rotatably connected to the connecting frame.

[0024] A preferred technical solution, the microjet assembly includes a nozzle installed on the upper end of the extraction tank, the upper end of the nozzle extends downward to provide an air inlet duct, the lower end of the air inlet duct extends downward to provide a compression duct, the inner diameter of the compression duct is smaller than the inner diameter of the air inlet duct, an injection port connected to the air inlet duct is provided on the inner wall of the upper end of the extraction tank, the upper end of the nozzle is provided with a connecting port connected to the air inlet duct, the connecting port is connected to the gas cylinder through an air supply pipe, the air supply pipe is connected to a high-pressure pump, a feed port is provided on the side wall of the nozzle, the feed port is vertically connected to the compression duct through a connecting channel, and the feed port is connected to a delivery pipe.

[0025] According to a preferred technical solution, a supporting edge is protruded from the inner wall of the filter tank, the filter basket is placed on the supporting edge, and a buffer structure is provided between the bottom of the filter basket and the supporting edge.

[0026] A preferred technical solution is that the filter basket is connected to an ultrasonic vibrator, and the ultrasonic vibrator includes an ultrasonic controller, a transducer and a connector. The ultrasonic controller is arranged outside the filter tank, and the transducer is arranged on the outer wall of the filter tank. The transducer and the ultrasonic controller are connected by an electric wire, and the connector is installed at the lower end of the filter basket, and the connector is connected to the transducer.

[0027] Compared with the prior art, the beneficial effects are:

[0028] 1. The present invention is used to extract alkaloids from oats, thereby improving the comprehensive extraction rate of oat alkaloids A, B, and C, so that the extract has a higher content of the three alkaloids.

[0029] 2. The oat grains are first softened in an acidic aqueous solution and then crushed with a high-speed rotating blade. The softened oat grains are easier to crush. The crushing process is divided into three stages, with the blade rotation speed gradually increasing and the particle size of the crushed oats gradually decreasing. The crushed oat grains are allowed to stand between each stage to further soften the crushed oat grains. This method makes it easier to crush the oat grains and reduces the force exerted on the oat grains by the blades when cutting. Compared to conventional grinding and crushing methods, the present invention can reduce the compression of the oat grains, thereby increasing the content of avenant alkaloid A in the extract.

[0030] 3. Compared with microwave extraction alone, the hybrid extraction method of microfluidics and ultrasound does not generate high heat. The vacuum concentration method can be used for concentration at low temperature, thus avoiding the degradation of oat alkaloid C caused by high heat.

[0031] 4. The present invention does not use high pressure treatment, which can effectively avoid the decrease in the content of avenant alkaloids A, B and C in the extract, thereby maintaining the high content of avenant alkaloids A, B and C. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flowchart of the steps of the extraction method of the present invention.

[0033] Figure 2 It is a schematic structural diagram of the extraction device in the present invention.

[0034] Figure 3 It is a schematic structural diagram of the crushing knife assembly in the present invention.

[0035] Figure 4 It is a schematic diagram of the structure of the microfluidic component in the present invention.

[0036] Reference numerals: 1, crushing unit; 101, crushing tank; 1011, feeding hopper; 1012, discharge port 1; 1013, valve 1; 102, crushing knife assembly; 1021, sun gear; 1022, planetary gear; 1023, ring gear; 1024, motor; 1025, connecting frame; 1026, chute; 1027, rotating rod; 1028, blade; 103, outer baffle; 104 , inner baffle; 105, feed pipe 1; 2, extraction part; 201, extraction tank; 2011, discharge port 2; 2012, valve 2; 202, micro jet assembly; 2021, nozzle; 2022, air inlet; 2023, connection port; 2024, compression channel; 2025, injection port; 2026, air supply pipe; 2027, gas cylinder; 2028, feed port; 2029, connection 3. Filter unit; 301. Filter tank; 3011. Top cover; 3012. Discharge port three; 3013. Valve three; 302. Filter basket; 3021. Filter membrane; 303. Support edge; 304. Buffer structure; 305. Ultrasonic vibrator; 3051. Ultrasonic controller; 3052. Transducer; 3053. Connector; 306. Feed pipe three; 4. Vacuum concentration unit; 401. Concentration tank; 4011. Top cover; 4012. Evaporation port; 402. Water bath heating component; 4021. Water tank; 4022. Electric heating rod; 403. Vacuum generating component; 4031. Vacuum tube; 4032. Vacuum pump; 4033. Vacuum gauge; 404. Condensation component; 4041. Condensation tube; 4042. Liquid collecting bottle. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] A method and device for extracting oat alkaloids with skin care effects, comprising the following steps:

[0039] S1. Add clean and dry oat grains to an acidic aqueous solution with a pH value of 3.5 to 5 and soak for 2 to 3 hours; the material-liquid ratio of oat grains to acidic aqueous solution is 1:7 to 1:10, and the acidic aqueous solution is HCl solution;

[0040] S2. Crushing oat grains into oat slurry in an acidic aqueous solution using high-speed rotating blades. The crushing is carried out in three stages: the first stage: the blade speed is 15,000-20,000 r / min, the crushing time is 25-30 minutes, and then the oat slurry is allowed to stand for 15-20 minutes; the second stage: the blade speed is 25,000-30,000 r / min, the crushing time is 15-20 minutes, and then the oat slurry is allowed to stand for 10 minutes; the third stage: the blade speed is 35,000-50,000 r / min, and the crushing time is 10-15 minutes;

[0041] S3. Subjecting the oat slurry to microfluidization-ultrasonic extraction to obtain an extraction mixture, wherein the flow rate of the microjet is 5-30 m / s and the ultrasonic power is 500-700 W;

[0042] S4, filtering the extracted mixture to obtain a supernatant; mixing the residue obtained from the first filtration with an acidic aqueous solution at a solid-liquid ratio of 1:5, performing microfluidization-ultrasonic extraction again, and then filtering. Repeat the extraction at least twice, and mix the supernatants obtained from multiple filtrations;

[0043] S5. The extracted supernatant is concentrated under vacuum to obtain oat alkaloid powder at a vacuum degree of 25-30 KPa, and heated in a water bath at a water bath temperature of 25-30°C.

[0044] By extracting alkaloids from oats, the comprehensive extraction rate of oat alkaloids A, B and C can be improved, so that the content of the three alkaloids in the extract is relatively high.

[0045] The oat grains are first softened in an acidic aqueous solution and then crushed with a high-speed rotating blade. The softened oat grains are easier to crush. The crushing is divided into three stages, with the blade rotation speed gradually increasing and the particle size of the crushed oats gradually decreasing. The crushed oat grains are allowed to stand between each stage to further soften the crushed oat grains. This method makes it easier to crush the oat grains and reduces the force exerted by the blades when cutting the oat grains. Compared to conventional grinding and crushing methods, the present invention can reduce the compression of the oat grains, thereby increasing the content of avenant alkaloid A in the extract.

[0046] In addition, compared with microwave extraction alone, the hybrid extraction method of microfluidics and ultrasound does not generate high heat, and the vacuum concentration method can be used for concentration at low temperature, thus avoiding the degradation of oat alkaloid C caused by high heat.

[0047] Furthermore, the present invention does not use high-pressure treatment, which can effectively avoid the decrease in the content of avenant alkaloids A, B and C in the extract, and maintain the high content of avenant alkaloids A, B and C in the extract.

[0048] The extraction device used in the above-mentioned extraction method includes a grinding section 1, an extraction section 2, a filtration section 3 and a vacuum concentration section 4 connected in sequence; oat grains and an acidic aqueous solution are added to the grinding section 1 and soaked in the grinding section 1, and then crushed into oat slurry in the grinding section 1. The oat slurry is then sent to the extraction section 2 for microjet-ultrasonic extraction. After filtering through a filter cloth, it is concentrated in the vacuum concentration section 4 to obtain oat alkaloid powder.

[0049] The pulverizing unit 1 includes a pulverizing tank 101. An inclined feeding hopper 1011 is provided on the sidewall of the pulverizing tank 101 and communicates with the interior of the pulverizing tank 101. A pulverizing blade assembly 102 is provided within the pulverizing tank 101. A discharge port 1012 is provided at the lower end of the pulverizing tank 101. The discharge port 1012 is equipped with a valve 1013 and is connected to a feed pipe 105. Oats and an acidic solution are fed from the feeding hopper 1011 into the pulverizing tank 101 for pulverization. Afterwards, the valve 1013 is opened to discharge the oat slurry from the discharge port 1012 and deliver it to the extraction unit 2 via the feed pipe 105.

[0050] The crushing knife assembly 102 includes a motor 1024, a planetary gear 1022 group, a rotating rod 1027 and a blade 1028. The planetary gear 1022 group is located in the crushing tank 101. The planetary gear 1022 group includes a horizontally arranged ring gear 1023, which is fixedly installed on the inner wall of the crushing tank 101. A sun gear 1021 is provided at the center of the ring gear 1023. The sun gear 1021 is driven to rotate by the motor 1024 installed at the top of the crushing tank 101. At least two planetary gears 1022 are evenly distributed around the sun gear 1021 at equal angles. The two planetary gears 1022 are meshed between the ring gear 1023 and the sun gear 1021. The centers of at least two planetary gears 1022 are fixedly connected to a vertically arranged rotating rod 1027, and a plurality of blades 1028 are installed on the rotating rod 1027. The blades 1028 on different rotating rods 1027 are staggered. There are at least two groups of stable structures below the ring gear 1023. The stable structure includes a connecting frame 1025. The connecting frame 1025 is installed on the inner wall of the crushing tank 101 and rotates horizontally. The rotating rod 1027 passes through the connecting frame 1025 and is rotatably connected to the connecting frame 1025.

[0051] The motor 1024 drives the sun gear 1021 to rotate, thereby driving the two planetary gears 1022 to rotate while also revolving around the sun gear 1021, and then driving the rotating rod 1027 to rotate and revolve, so that the blade 1028 can move around the crushing tank 101 while performing rotary cutting, which can increase the cutting range of the blade 1028 and improve the cutting efficiency and uniformity.

[0052] The stabilizing structure further includes a slide groove 1026 provided on the inner wall of the crushing tank 101. The slide groove 1026 is arranged in a circle. Both ends of the connecting frame 1025 are embedded in the slide groove 1026 and slide. By vertically spacing at least two groups of stabilizing structures, the rotating rod 1027 has multi-point support, thereby ensuring the stability of the rotating rod 1027 and reducing the shaking of the rotating rod 1027.

[0053] A shielding plate is provided below at least two sets of stabilizing structures. The shielding plate includes an outer baffle 103 fixed to the inner wall of the crushing tank 101. The outer baffle 103 is arranged in a ring shape, and an inner baffle 104 is provided at the center of the outer baffle 103. The center of the inner baffle 104 is fixedly connected to the center of the connecting frame 1025. The edge of the inner baffle 104 and the inner edge of the outer baffle 103 form a circle of rotating channels that match the transmission rod, and the transmission rod is arranged to pass through the rotating channel. The provision of the shielding plate reduces the possibility of solution splashing into the upper structure when the blade 1028 rotates at high speed to crush the oats. The connection between the feeding hopper 1011 and the crushing tank 101 is located below the shielding plate.

[0054] The extraction unit 2 includes an extraction tank 201, which is connected to the first feeding pipe 105. A second discharge port 2011 is provided at the lower end of the extraction tank 201. This second discharge port 2011 is equipped with a second valve 2012, which is connected to the second feeding pipe 204. The extraction tank 201 is also equipped with a microfluidic assembly 202 and an ultrasonic generator 203. The oat slurry is delivered to the extraction tank 201 via the first feeding pipe 105. After extraction, the oat slurry is delivered to the filtration unit 3 through the second discharge port 2011 and the second feeding pipe 204 by opening the second valve 2012.

[0055] The micro jet assembly 202 includes a nozzle 2021 installed at the upper end of the extraction tank 201, an air inlet 2022 extending downward from the upper end of the nozzle 2021, a compression channel 2024 extending downward from the lower end of the air inlet 2022, the inner diameter of the compression channel 2024 is smaller than the inner diameter of the air inlet 2022, an injection port 2025 communicating with the air inlet 2022 is provided on the inner wall of the upper end of the extraction tank 201, and the nozzle 2021 is provided with a nozzle 2021. The upper end of 021 is provided with a connecting port 2023 connected to the air inlet duct 2022, and the connecting port 2023 is connected to the gas cylinder 2027 through the air supply pipe 2026, and the air supply pipe 2026 is connected to a high-pressure pump. A feed port 2028 is provided on the side wall of the nozzle 2021, and the feed port 2028 is vertically connected to the compression channel 2024 through a connecting channel 2029, and the feed port 2028 is connected to the delivery pipe 105.

[0056] The gas in the gas cylinder 2027 is pressurized and transported to the air inlet 2022 by a high-pressure pump, and then the high-pressure gas enters the narrow compression channel 2024 and flows at a high speed. The high-speed flow of the gas generates a negative pressure in the connecting channel 2029, thereby attracting the slurry in the crushing tank 101 to be transported along the feed pipe 105 to the feed port 2028 and then enters the compression channel 2024. After the slurry enters the compression channel 2024, it will be driven by the high-speed airflow to form an ultra-high-speed jet. When it is ejected from the ejection port 2025, the fluid is subjected to severe shear force, the oat particles are crushed and dispersed, the cell walls are quickly broken, and the internal active substances are released. In addition, during the jetting process, the fluid will produce high-intensity turbulence and collision, which further increases the energy exchange in the fluid and the particle crushing efficiency.

[0057] The ultrasonic generator 203 adopts existing technology and refers to the ultrasonic extraction device in conventional means. The oat slurry after micro-jetting is further subjected to ultrasonic extraction to further release the active substance.

[0058] The filter portion 3 includes a filter tank 301, the upper end of which is sealed with a top cover 3011, and the top cover 3011 is detachably connected to the filter tank 301 through a flange, the second feed pipe 204 is connected to the top cover 3011, and the second feed pipe 204 is set with a hose, the lower end of the filter tank 301 is provided with a third discharge port 3012, the third discharge port 3012 is provided with a third valve 3013, and the third discharge port 3012 is connected to the third feed pipe 306, a detachable filter basket 302 is provided in the filter tank 301, the filter basket 302 can be taken out of the filter tank 301, a filter membrane 3021 is provided at the lower end of the filter basket 302, and at least one circle of sealing ring is provided on the outer wall of the filter basket 302, which is attached to the inner wall of the filter tank 301.

[0059] Open valve three 3013, and the negative pressure generated by the vacuum concentrator 4 draws the extracted oat slurry from the extraction tank 201 into the filter tank 301. The oat slurry falls into the filter basket 302 and is filtered through the filter membrane 3021. The filtered clear liquid is then drawn into the vacuum concentrator 4 through the negative pressure of the vacuum concentrator 4 through the discharge port three 3012 and the feed pipe three 306. After filtration is complete, the top cover 3011 can be opened, the filter basket 302 removed, and the residue in the filter basket re-mixed with the acidic solution before being re-added to the crushing tank 101 for further extraction.

[0060] The inner wall of the filter tank 301 is provided with a supporting edge 303, the filter basket 302 is placed on the supporting edge 303, and a buffer structure 304 is provided between the bottom of the filter basket 302 and the supporting edge 303. The buffer structure 304 is a rubber gasket.

[0061] The filter basket 302 is connected to an ultrasonic vibrator 305, which includes an ultrasonic controller 3051, a transducer 3052, and a connector 3053. The ultrasonic controller 3051 is located outside the filter tank 301, and the transducer 3052 is located on the outer wall of the filter tank 301. The transducer 3052 and the ultrasonic controller 3051 are connected by an electrical wire. The connector 3053 is mounted at the lower end of the filter basket 302 and is connected to the transducer 3052. The ultrasonic vibrator 305 drives the filter basket 302 to vibrate, thereby reducing clogging of the filter membrane 3021 and improving filtration efficiency.

[0062] The vacuum concentration section 4 includes a concentration tank 401, the upper end flange of the concentration tank 401 is connected to a detachable upper cover 4011, the upper cover 4011 is provided with an evaporation port 4012, the evaporation port 4012 is connected to a condensation component 404, the feed pipe 306 is connected to the upper cover 4011, the concentration tank 401 is also connected to a vacuum generating component 403, and the lower end of the concentration tank 401 is connected to a water bath heating component 402.

[0063] The condensation component 404 adopts existing technology, including a condenser 4041 and a liquid collecting bottle 4042. The condenser 4041 is connected to the upper end of the evaporation port 4012, and the outlet of the condenser 4041 is sealed with the liquid collecting bottle 4042. The evaporated solvent is condensed through the condenser 4041 and flows into the liquid collecting bottle 4042 for collection.

[0064] The vacuum generating assembly 403 adopts the existing technology, and includes a vacuum tube 4031 connected to the concentration tank 401 , and the vacuum tube 4031 is connected to a vacuum pump 4032 and a vacuum gauge 4033 .

[0065] The water bath heating component 402 adopts the existing technology and includes a water tank 4021. The lower end of the concentration tank 401 is located in the water tank 4021. The water tank 4021 is also provided with an electric heating rod 4022.

[0066] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0068] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A method for extracting oat alkaloids with skin care effects, characterized in that: The following steps are involved: S1. Add clean and dry oat grains to an acidic aqueous solution with a pH value of 3.5-5 and soak for 2-3 hours; S2. The oat grains are crushed into oat slurry by high-speed rotating blades in an acidic aqueous solution. The crushing is carried out in three stages. In the first stage, the blade speed is 15,000-20,000 r / min, the crushing time is 25-30 minutes, and then the oat slurry is allowed to stand for 15-20 minutes. The second stage: the blade speed is 25000~30000r / min, the crushing time is 15~20min, and then it is left to stand for 10min; The third stage: the blade speed is 35000~50000r / min, and the crushing time is 10~15min; S3. Subjecting the oat slurry to microfluidization-ultrasonic extraction to obtain an extraction mixture, wherein the flow rate of the microjet is 5-30 m / s and the ultrasonic power is 500-700 W; S4, filtering the extraction mixture to obtain an extraction supernatant; S5. Concentrate the extract under vacuum to obtain avenanthramide powder at a vacuum degree of 25-30 KPa and heat in a water bath at a temperature of 25-30° C. The extraction device used in the above extraction method comprises a pulverizing section (1), an extraction section (2), a filtering section (3) and a vacuum concentration section (4) connected in sequence; The crushing part (1) comprises a crushing tank (101), a feeding hopper (1011) is provided on the side wall of the crushing tank (101) and is inclined and communicated with the crushing tank (101), a crushing knife assembly (102) is provided in the crushing tank (101), a discharge port (1012) is provided at the lower end of the crushing tank (101), a valve (1013) is provided at the discharge port (1012), and a feed pipe (105) is connected to the discharge port (1012); The extraction part (2) comprises an extraction tank (201), the extraction tank (201) is connected to a first feeding pipe (105), a second discharge port (2011) is provided at the lower end of the extraction tank (201), the second discharge port (2011) is provided with a second valve (212), the second discharge port (2011) is connected to a second feeding pipe (204), and a micro jet assembly (202) and an ultrasonic generator (203) are provided on the extraction tank (201); The filtering portion (3) comprises a filter tank (301), the upper end of the filter tank (301) is provided with a top cover (3011), the top cover (3011) is detachably connected to the filter tank (301) via a flange, the second feed pipe (204) is connected to the top cover (3011), the lower end of the filter tank (301) is provided with a third discharge port (3012), the third discharge port (3012) is provided with a third valve (3013), the third discharge port (3012) is connected to the third feed pipe (306), a detachable filter basket (302) is provided in the filter tank (301), the lower end of the filter basket (302) is provided with a filter membrane (3021), and the outer wall of the filter basket (302) is provided with at least one sealing ring attached to the inner wall of the filter tank (301); The vacuum concentration section (4) includes a concentration tank (401), the upper end flange of the concentration tank (401) is connected to a detachable upper cover (4011), the upper cover (4011) is provided with an evaporation port (4012), the evaporation port (4012) is connected to a condensation component (404), the feed pipe (306) is connected to the upper cover (4011), the concentration tank (401) is further connected to a vacuum generating component (403), and the lower end of the concentration tank (401) is connected to a water bath heating component (402); The crushing blade assembly (102) comprises a motor (1024), a planetary gear (1022) group, a rotating rod (1027) and a blade (1028). The planetary gear (1022) group is located in the crushing jar (101). The planetary gear (1022) group comprises a horizontally arranged ring gear (1023). The ring gear (1023) is fixedly mounted on the inner wall of the crushing jar (101). A sun gear (1021) is provided at the center of the ring gear (1023). The sun gear (1021) is driven to rotate by the motor (1024) mounted on the top of the crushing jar (101). At least two planetary gears (1022) are evenly distributed around the sun gear (1021) at equal angles. At least two planetary gears (1022) are meshed between the ring gear (1023) and the sun gear (1021); the centers of at least two planetary gears (1022) are fixedly connected to a vertically arranged rotating rod (1027); a plurality of blades (1028) are mounted on the rotating rod (1027); and the blades (1028) on different rotating rods (1027) are arranged in a staggered manner; at least two groups of stabilizing structures are located below the ring gear (1023); the stabilizing structures include a connecting frame (1025); the connecting frame (1025) is mounted on the inner wall of the crushing tank (101) and rotates horizontally; the rotating rod (1027) passes through the connecting frame (1025) and is rotatably connected to the connecting frame (1025).

2. The method for extracting oat alkaloids with skin care effect according to claim 1, wherein: In step S1, the material-liquid ratio of oat grains to acidic aqueous solution is 1:7-1:

10.

3. The method for extracting oat alkaloids with skin care effect according to claim 1, wherein: The acidic aqueous solution is an HCl solution.

4. The method for extracting oat alkaloids with skin care effect according to claim 1, wherein: In step S4, the residue obtained by the first filtration is mixed with an acidic aqueous solution at a solid-liquid ratio of 1:5, and then subjected to microfluidization-ultrasonic extraction again, followed by filtration. The extraction is repeated at least twice, and the extracted supernatants obtained by multiple filtrations are mixed.

5. The method for extracting oat alkaloids with skin care effect according to claim 1, wherein: The micro-jet assembly (202) comprises a nozzle (2021) mounted on the upper end of the extraction tank (201), the upper end of the nozzle (2021) extending downwardly to be provided with an air inlet channel (2022), the lower end of the air inlet channel (2022) extending downwardly to be provided with a compression channel (2024), the inner diameter of the compression channel (2024) being smaller than the inner diameter of the air inlet channel (2022), an injection port (2025) communicating with the air inlet channel (2022) being provided on the inner wall of the upper end of the extraction tank (201), the nozzle (2021) extending downwardly to be provided with an air inlet channel (2022), the lower end of the air inlet channel (2022) extending downwardly to be provided with a compression channel (2024), the inner diameter of the compression channel (2024) being smaller than the inner diameter of the air inlet channel (2022), the inner wall of the upper end of the extraction tank (201) being provided with a injection port (2025) communicating with the air inlet channel (2022), The upper end of the nozzle (21) is provided with a connecting port (2023) connected to the air inlet (2022), the connecting port (2023) is connected to the gas cylinder (2027) through the air supply pipe (2026), the air supply pipe (2026) is connected to a high-pressure pump, and a feed port (2028) is provided on the side wall of the nozzle (2021), the feed port (2028) is vertically connected to the compression channel (2024) through the connecting channel (2029), and the feed port (2028) is connected to the feed pipe (105).

6. The method for extracting oat alkaloids with skin care effect according to claim 1, wherein: A supporting edge (303) is protruding from the inner wall of the filter tank (301), the filter basket (302) is placed on the supporting edge (303), and a buffer structure (304) is provided between the bottom of the filter basket (302) and the supporting edge (303).

7. The method for extracting oat alkaloids with skin care effect according to claim 1, wherein: The filter basket (302) is connected to an ultrasonic vibrator (305), the ultrasonic vibrator (305) comprising an ultrasonic controller (3051), a transducer (3052), and a connector (3053), the ultrasonic controller (3051) being arranged outside the filter tank (301), the transducer (3052) being arranged on the outer wall of the filter tank (301), the transducer (3052) and the ultrasonic controller (3051) being connected via an electric wire, the connector (3053) being mounted at the lower end of the filter basket (302), and the connector (3053) being connected to the transducer (3052).

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