CN115946387A - Extraction method and application of high-activity stevioside - Google Patents

Extraction method and application of high-activity stevioside Download PDF

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CN115946387A
CN115946387A CN202211053297.9A CN202211053297A CN115946387A CN 115946387 A CN115946387 A CN 115946387A CN 202211053297 A CN202211053297 A CN 202211053297A CN 115946387 A CN115946387 A CN 115946387A
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stevioside
stevia rebaudiana
activity
solution
squeezing
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CN115946387B (en
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赵新峰
姚五洲
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Shandong Shengxiangyuan Biotechnology Co ltd
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Shandong Shengxiangyuan Biotechnology Co ltd
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Abstract

The invention relates to the technical field of stevioside, and particularly discloses a high-activity stevioside extraction method and application thereof; the extraction method comprises 1) drying stevia leaf, pulverizing, and sieving; 2) Soaking the sieved stevia rebaudiana leaves in the extracting solution, fishing out the stevia rebaudiana leaves after soaking, squeezing for two times, and mixing squeezed liquid obtained by squeezing for two times with the soaking solution to obtain the extracting solution; 3) Centrifuging the obtained extract to remove impurities, and decolorizing and deodorizing the centrifugate after removing the impurities; 4) Sequentially washing the column and analyzing the extracting solution, and carrying out vacuum concentration on the analyzed solution; 5) Spraying the concentrated solution in a spray drying tower to obtain high-activity stevioside; the extraction method can fully extract the stevioside in the stevia rebaudiana leaves, greatly improves the extraction rate of the stevioside, has a simple extraction process, and does not have the conditions of high temperature and high pressure, so that the activity of the extracted stevioside is effectively ensured.

Description

Extraction method and application of high-activity stevioside
Technical Field
The invention relates to the technical field of stevioside, and particularly discloses a high-activity stevioside extraction method and application thereof.
Background
Stevioside is a natural sweetener extracted from stevia rebaudiana Bertoni plants, has high sweetness and low calorie, has no side effect on human bodies, and is widely applied to various products such as food, beverage, oral liquid, chewing gum, buccal tablets and the like to replace chemically synthesized sweetener products such as aspartame, saccharin sodium, sodium cyclamate and the like. Stevia sugar from stevia rebaudiana is considered by medical researchers to be safer for humans than synthetic sweeteners.
The traditional method for extracting the stevioside adopts an extraction method of soaking stevia leaves in a tank, the water consumption is large, and salt is added into a leaching solution to remove impurities, so that the method for extracting the stevioside has the advantages of low extraction rate and poor extraction activity of the stevioside, high production cost, unstable operation and low product purity.
The invention patent with application number 201610402354.8 discloses a process for extracting stevioside, which comprises the following steps: (1) Placing stevia rebaudiana leaf in an extraction column, adding water, pressurizing and performing countercurrent extraction; (2) decoloring and deodorizing the leaching solution; (3) industrial preparative chromatographic separation: a. putting the sugar liquid obtained in the step (2) on an industrial chromatographic column for sampling; b. eluting with 55-60% high-concentration ethanol, collecting the sugar-containing eluate, filtering with membrane, diluting the sugar-containing eluate with 1-2 times of water, and refining by step (4); c. eluting with 25-35% low concentration ethanol solution, collecting the sugar-containing eluate, filtering with membrane, recovering the eluate to remove ethanol, loading onto chromatographic column, and eluting according to the method in step (3) b; (4) Carrying out decoloring, desalting, deodorizing treatment and concentration on the liquid obtained in the step (3) b; and (5) filtering and drying. The purity of the product prepared by the extraction method disclosed by the invention is more than 90%, the process is simplified, the use amount of solvents such as water, ethanol and the like is reduced, the production cost is low, but only the stevia rebaudiana is directly placed in an extraction column for extraction, so that the effective components in the stevia rebaudiana cannot be fully extracted, and the extraction rate of the stevia rebaudiana is low.
Unable balanced stevia rebaudianum leaf needs to be fully squeezed and stevia rebaudianum leaf can not excessively squeeze among the current high activity stevioside extraction element, leads to stevioside's extraction efficiency to hang down to and extrude than too big can lead to the material to heat up too fast and lead to the active ingredient in the juice to take place to deteriorate because of too high temperature.
Therefore, the invention provides a high-activity stevioside extraction method and application thereof, aiming at the defects of the traditional stevioside extraction method and the existing stevioside extraction process and device.
Disclosure of Invention
The invention aims to provide a high-activity stevioside extraction method and application thereof, aiming at the defects of the traditional stevioside extraction method and the existing stevioside extraction process.
The invention is realized by the following technical scheme:
a device for extracting high-activity stevioside is a screw pressing device and comprises a machine frame and a material receiving box.
Furthermore, a first spiral squeezing device and a second spiral squeezing device are arranged in parallel in front and at the back of the upper end of the rack.
Furthermore, the same side end parts of the first screw press device and the second screw press device are connected through a U-shaped conveying pipeline.
Further, the first screw press device includes a first press machine casing fixedly installed in the frame.
Furthermore, the lower end of the first press case is connected with a first pulp guide hopper which is arranged in a left-low and right-high mode, and the lower end of the first pulp guide hopper is connected with a first discharging pipe.
The invention also provides an extraction method adopting the device for extracting the high-activity stevioside, which comprises the following steps:
1) Weighing a certain amount of stevia rebaudiana leaves, drying the stevia rebaudiana leaves, crushing and sieving the dried stevia rebaudiana leaves for later use;
2) Soaking sieved stevia rebaudiana into the extracting solution, fishing out the stevia rebaudiana after soaking, sequentially performing primary squeezing and secondary squeezing in the spiral squeezing equipment of any one of claims 1 to 5, and mixing squeezed liquid obtained by the secondary squeezing with soaking liquid to obtain the extracting solution;
3) Performing centrifugal separation on the obtained extracting solution to remove impurities, and then performing decoloration and deodorization on the centrifugate after the impurities are removed;
4) Sequentially washing the column and analyzing the decolored and deodorized extract, and carrying out vacuum concentration on the analyzed solution;
5) And finally, spraying the concentrated solution in a spray drying tower to convert the sugar solution into powdery solid, thus obtaining the high-activity stevioside.
Furthermore, the water content of the dried stevia rebaudiana leaves in the step 1) is controlled to be 18-32%, and the mesh number of the dried stevia rebaudiana leaves sieved is 100-200 meshes.
Furthermore, the temperature for vacuum concentration of the analysis solution in the step 4) is controlled between 56 ℃ and 64 ℃.
Furthermore, the invention also provides application of the high-activity stevioside prepared by the method in food.
Has the beneficial effects that:
1) According to the method for extracting the high-activity stevioside, the stevia rebaudiana leaves are dried to remove water, then are crushed and soaked in the extracting solution, the extracting solution is squeezed twice by using a spiral squeezing device after being soaked for a period of time, the squeezed solution and the extracting solution are mixed, and a series of impurity removal and purification operations are performed on the mixed extracting solution.
2) When the preparation device disclosed by the invention is used for squeezing stevia rebaudiana leaves, raw materials are conveyed to the pulp squeezing die head through the feeding spiral leaves, as the pulp squeezing die head is internally provided with the circular table hole matched with the tower type reducing squeezing spiral leaves, the stevia rebaudiana leaves are extruded for one time under the squeezing action of the pulp squeezing die head and the tower type reducing squeezing spiral leaves, and the pulp squeezing die head is connected with the sealing ring block through the guide column and the adjusting spring in the process of one-time extrusion, the pulp squeezing die head has a certain retraction space, when the squeezing ratio is overlarge, the adjusting spring can be compressed to move outwards, and the deterioration of effective components in juice due to overhigh temperature caused by the fact that the temperature of materials is excessively increased due to the overlarge squeezing ratio is effectively prevented; in addition, the material is subjected to the extrusion effect of reducing and variable-pitch extrusion spiral leaves in the second extrusion cylinder in the whole process, and all effective components in stevia rebaudiana leaves are fully extruded in advance under the condition of effectively controlling the extrusion temperature, so that the extraction rate of the stevia rebaudiana is greatly improved.
3) When the preparation device with the size design disclosed by the invention is used for squeezing the stevia rebaudiana leaves, the stevia rebaudiana leaves can be balanced to be fully squeezed and cannot be excessively squeezed, the extraction rate of the stevioside is improved, and the deterioration of effective components in juice due to overhigh temperature caused by the fact that the temperature of materials is excessively increased due to the excessively large squeezing ratio is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the extraction process of high-activity stevioside according to the invention;
FIG. 2 is a schematic view of a first-angle perspective structure of a manufacturing apparatus according to the present invention;
FIG. 3 is a schematic view of a second angular perspective structure of the manufacturing apparatus of the present invention;
FIG. 4 is a schematic perspective view of a first screw press apparatus according to the present invention;
FIG. 5 is a schematic view showing the internal plan structure of the first screw press apparatus of the present invention;
FIG. 6 is a perspective exploded view of a first container, a closure ring block, a wringing die head, etc. in accordance with the present invention;
FIG. 7 is a schematic view of the internal plan structure of the primary container of the present invention;
FIG. 8 is a schematic view showing the connection of a first container, a second container and a U-shaped feed pipe according to the present invention;
FIG. 9 is a schematic perspective view of a U-shaped feed delivery pipe according to the present invention;
FIG. 10 is a schematic view of the internal plan structure of a secondary container according to the present invention;
FIG. 11 is a schematic perspective view of an arc-shaped brush plate, brush filaments and bumps according to the present invention;
FIG. 12 is a schematic drawing showing the dimensions of the internal planar structure of the primary container of the present invention.
Wherein:
100-a frame, 101-a support frame, 102-a bearing plate; 200-a material receiving box;
300-a first screw press device, 301-a first press case, 302-a first pulp guide hopper, 303-a first discharge pipe, 304-a first extrusion cylinder, 305-a feeding hopper, 306-a first driving device, 3071-a feeding screw blade, 3072-a tower type reducing extrusion screw blade, 308-a sealing ring block, 3081-a round hole, 309-a pulp extrusion die head, 310-an inserting pipe, 311-a guide column and 312-an adjusting spring;
400-a second screw press device, 401-a second press cabinet, 402-a second extrusion cylinder, 4021-a whole-course extrusion cavity, 403-a shaft rod insertion pipe, 404-a second driving device, 405-a rotating rod, 406-a variable-diameter variable-pitch extrusion spiral blade, 407-a joint pipe and 408-a slag discharge pipe;
500-U-shaped material conveying pipe, 601-arc brush plate, 602-brush wire, 603-lug, 604-transmission screw rod and 605-cleaning motor.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings 1 to 11, in conjunction with the embodiments.
Example 1
This example 1 discloses a method for extracting high-activity stevioside, which can be referred to as fig. 1, and includes the following steps:
s1, weighing a certain amount of stevia rebaudiana leaves, drying the stevia rebaudiana leaves, crushing and sieving the dried stevia rebaudiana leaves for later use; wherein the water content of dried stevia rebaudiana leaves is controlled to be 20%, and the mesh number of the dried stevia rebaudiana leaves is 120 meshes;
s2, soaking the sieved stevia rebaudiana leaves in the extracting solution, fishing out the stevia rebaudiana leaves after soaking, sequentially performing primary squeezing and secondary squeezing in a spiral squeezing device, and mixing squeezed liquid obtained by the two-time squeezing and the soaking solution to obtain the extracting solution;
s3, carrying out centrifugal separation on the obtained extracting solution to remove impurities, and then carrying out decoloration and deodorization on the centrifugate after the impurities are removed;
and S4, sequentially washing and resolving the decolored and deodorized extracting solution, carrying out vacuum concentration on the resolving solution, and controlling the vacuum concentration temperature of the resolving solution to be 58 ℃.
And S5, finally, spraying the concentrated solution in a spray drying tower to convert the sugar solution into powdery solid, thus obtaining the high-activity stevioside.
Example 2
This example 2 discloses a method for extracting high-activity stevioside, which can be referred to as fig. 1, and includes the following steps:
s1, weighing a certain amount of stevia rebaudiana leaves, drying the stevia rebaudiana leaves, crushing and sieving the dried stevia rebaudiana leaves for later use; wherein the water content of dried stevia rebaudiana leaves is controlled to be 26%, and the mesh number of the dried stevia rebaudiana leaves is 160 meshes;
s2, soaking the sieved stevia rebaudiana leaves in the extracting solution, fishing out the stevia rebaudiana leaves after soaking, sequentially performing primary squeezing and secondary squeezing in a spiral squeezing device, and mixing squeezed liquid obtained by the two-time squeezing and the soaking solution to obtain the extracting solution;
s3, performing centrifugal separation on the obtained extracting solution to remove impurities, and then performing decoloration and deodorization on the centrifugate after the impurities are removed;
and S4, sequentially washing and resolving the decolored and deodorized extracting solution, concentrating the resolving solution in vacuum, and controlling the vacuum concentration temperature of the resolving solution to be 62 ℃.
And S5, finally, spraying the concentrated solution in a spray drying tower to convert the sugar solution into powdery solid, thus obtaining the high-activity stevioside.
In conclusion, in the high-activity stevioside extraction methods adopted in embodiments 1 and 2, the stevia rebaudiana leaves are dried to remove moisture, then the stevia rebaudiana leaves are crushed and soaked in the extracting solution, the extracting solution is soaked for a period of time and then squeezed twice by using a spiral squeezing device, the squeezed solution and the extracting solution are mixed, and a series of impurity removal and purification operations are performed on the mixed extracting solution.
Example 3
This example 3 discloses a manufacturing apparatus which is a screw press apparatus in step 2, and is described in detail below with reference to fig. 2 to 11.
Referring to fig. 2 and 3, the main body of the device comprises a frame 100 and a material receiving box 200, wherein a first screw press device 300 and a second screw press device 400 are arranged at the upper end of the frame 100 in a front-back side-by-side manner, and the same side ends of the first screw press device 300 and the second screw press device 400 are connected through a U-shaped material conveying pipe 500.
Referring to fig. 4, 5, 6 and 7, the first spiral press apparatus 300 includes a first press box 301, the frame 100 includes support frames 101 at left and right ends and a bearing plate 102 fixed on the two support frames 101, a mounting opening for mounting the first press box 301 is opened on the bearing plate 102, and the first press box 301 is fixedly mounted on the bearing plate 102 through the mounting opening.
The lower end of the first press machine box 301 is connected with a first pulp guide hopper 302 which is arranged in a left-low and right-high mode, the lower end of the first pulp guide hopper 302 is connected with a first discharging pipe 303, and the material receiving box 200 is arranged right below the first discharging pipe 303 and used for receiving press liquid. A first extrusion cylinder 304 is fixedly installed in the first press box 301, a large number of liquid outlet holes are formed in the lower half part of the first extrusion cylinder 304, a feeding hopper 305 is connected to the upper surface of the left end of the first extrusion cylinder 304, and the feeding hopper 305 extends out of the upper surface of the first press box 301.
A sealing bearing is arranged on the left end face of the first extrusion cylinder 304, a first driving device 306 is arranged on the left end face of the first press case 301, and a feeding spiral blade 3071 is connected to the end portion, extending into the inner cavity of the first extrusion cylinder 304, of an output shaft of the first driving device 306 through the sealing bearing. When the first driving device 306 is specifically arranged, the first driving device comprises a reduction gearbox and a driving motor, the driving motor is connected with an input shaft of the reduction gearbox, and an output shaft of the reduction gearbox is connected with the feeding spiral blade 3071. Then the right end of the feeding screw blade 3071 is connected with a tower type reducing extrusion screw blade 3072.
The right end of the first extrusion cylinder 304 is fixedly connected with a sealing ring block 308, the inner side surface of the sealing ring block 308 is provided with a plurality of circular holes 3081 in an annular array form, the right end of the inner cavity of the first extrusion cylinder 304 is provided with a pulp extruding die head 309, the outer wall of the pulp extruding die head 309 is attached to the inner cavity of the first extrusion cylinder 304, a round platform hole 3091 with a wide left side and a narrow right side is formed in the pulp extruding die head 309, the right end of the pulp extruding die head 309 is connected with an inserting pipe 310 extending out of the sealing ring block 308, the right end surface of the pulp extruding die head 309 is connected with a guide column 311 inserted into each corresponding circular hole 3081, each guide column 311 is sleeved with an adjusting spring 312, and two ends of each adjusting spring 312 are respectively connected with the inner walls of the pulp extruding die head 309 and the circular holes 3081.
The second screw press 400 is similar to the first screw press 300 in structure design, and includes a second press box 401 fixedly installed in the frame 100, and the second press box 401 is also fixedly installed on the carrying plate 102 through an installation opening. The lower end of the second press case 401 is connected with a second pulp guide hopper which is arranged in a left-low and right-high manner, the lower end of the second pulp guide hopper is connected with a second discharge pipe, and the second discharge pipe is also arranged right above the material receiving box 200.
Referring to fig. 10, a second extrusion cylinder 402 is fixedly installed in a first press box 401, a large number of liquid outlet holes are also formed in the lower half portion of the second extrusion cylinder 402, and a whole-course extrusion cavity 4021 which is narrow at the left and wide at the right is formed in the second extrusion cylinder 402.
Referring to fig. 8 and 9, one end of a U-shaped feed pipe 500 is connected to the end of the insertion pipe 310, and the other end is connected to the right end of the second container 402. The right end of the U-shaped feed delivery pipe 500 is connected with a shaft rod insertion pipe 403 which is positioned on the same central axis with the second extrusion cylinder 402, the outer end of the shaft rod insertion pipe 403 is provided with a second driving device 404, and the structural design of the second driving device 404 is the same as that of the first driving device. The output shaft of the second driving device 404 is connected with a rotating rod 405, the rotating rod 405 penetrates through the shaft rod insertion pipe 403 and extends into the whole extrusion cavity 4021, the end of the rotating rod 405 is connected with a variable-diameter variable-pitch extrusion spiral blade 406, the diameter and the thread pitch of the variable-diameter variable-pitch extrusion spiral blade 406 are gradually reduced from right to left, the left end, extending out of the second press case 401, of the second extrusion cylinder 402 is connected with a joint pipe 407, and the joint pipe 407 is connected with a slag discharge pipe 408.
Finally, the preparation device is also provided with cleaning devices for dredging the liquid outlet holes in the first press machine case 301 and the second press machine case 401. Referring to fig. 5 and 11, the cleaning apparatus includes an arc-shaped brush plate 601 disposed below the first extrusion cylinder 304 or the second extrusion cylinder 402, a large number of brush filaments 602 are disposed on an upper surface of the arc-shaped brush plate 601, two bumps 603 are connected to a lower surface of the arc-shaped brush plate 601, guide sliding holes and threaded holes are respectively formed on the two bumps 603, guide sliding rods and transmission screws 604 matched with the guide sliding holes and the threaded holes are disposed in the first press box 301 and the second press box 401, an end of the transmission screw 604 is connected to a cleaning motor 605, the transmission screw 604 is driven by the cleaning motor 605 to rotate forward and backward, the arc-shaped brush plate 601 is moved left and right by matching of the transmission screw 604 and the threaded holes, and liquid outlet holes on the first extrusion cylinder 304 or the second extrusion cylinder 402 are combed by the brush filaments 602 during movement to prevent blockage.
When the screw squeezing device disclosed in this embodiment 3 squeezes stevia rebaudiana leaves, an operator firstly puts raw materials into the feeding hopper 305 through the first driving device, and synchronously drives the feeding screw leaf 3071 and the tower type reducing extrusion screw leaf 3072 through the first driving device, wherein the feeding screw leaf 3071 conveys the raw materials to the pulp squeezing die head 309, at this time, as the circular table hole 3091 matched with the tower type reducing extrusion screw leaf 3072 is formed in the pulp squeezing die head 309, effective juice in stevia rebaudiana leaves is squeezed and discharged at one time under the squeezing action of the feeding screw leaf 3071 and the tower type reducing extrusion screw leaf, the discharged juice is discharged through the liquid outlet hole, and as the pulp squeezing die head 309 is connected with the sealing ring block 308 through the guide column and the adjusting spring 312, the pulp squeezing die head 309 has a certain retraction space, when the squeezing ratio is too large, the adjusting spring 312 can be compressed and moved outward, so as to prevent the effective components in the juice from being deteriorated due to too high temperature caused by too fast temperature of the material with too large squeezing ratio.
Then, the material discharged from the pulp extruding die head 309 enters the second extrusion cylinder 402 through the U-shaped material conveying pipe 500, and the material is subjected to the extrusion effect of reducing and variable-pitch extrusion of the spiral blade 406 in the second extrusion cylinder 402 in the whole process, so that all the active ingredients in the stevia rebaudiana leaves are fully extruded in advance by effectively controlling the extrusion temperature, and the extraction rate of the stevia rebaudiana is greatly improved.
Example 4
Example 4 discloses the dimensioning of the screw press apparatus of example 3, which is explained in detail below with reference to fig. 7 and 12.
The axial length of the lowermost end of the feeding hopper 305 is A, the nominal radius of the feeding screw blade 3071 is B, the screw pitch of the feeding screw blade 3071 is C, the height of the feeding hopper 305 is D, and the speed of the raw material reaching the lowermost end of the feeding hopper 305 is V 1 The first driving device 306 has a rotation speed V n Axial feeding speed of the feeding screw blade 3071 is V 2
When it is satisfied with
Figure SMS_1
During the process, the feeding spiral blade 3071 is filled with materials, so that the materials can be timely conveyed to the tower type reducing extrusion spiral blade 3072, the materials can be fully extruded between the reducing extrusion spiral blade 3072 and the pulp extrusion die head 309, the effective components in the materials can be fully extruded, and the extraction rate is improved.
Known to the person skilled in the art
Figure SMS_2
V 2 =V n xC (3) in the formula 1, when satisfied
Figure SMS_3
In the process, the materials can be fully extruded between the reducing extrusion spiral blade 3072 and the pulp extrusion die head 309, so that the effective components in the materials can be fully extruded, and the extraction rate is improved.
Furthermore, as can be seen from example 3, an excessively high extrusion ratio results in an excessively rapid temperature rise of the material and a deterioration of the active ingredients in the juice due to an excessively high temperature, and therefore, it is preferable
Figure SMS_4
At the moment, the materials can be fully extruded between the reducing extrusion spiral blade 3072 and the pulp extrusion die head 309, the effective components in the materials can be fully extruded, the extraction rate is improved, and the situation that the effective components in the juice are deteriorated due to overhigh temperature caused by the fact that the temperature of the materials is too fast due to overlarge extrusion ratio is avoided.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A device for extracting high-activity stevioside is characterized in that the device is a screw pressing device and comprises a machine frame (100) and a material receiving box (200).
2. The apparatus of claim 1, wherein the upper end of the frame (100) is provided with a first screw press (300) and a second screw press (400) arranged side by side in front and rear.
3. The apparatus as claimed in claim 1, wherein the first screw press (300) and the second screw press (400) are connected at the same side ends thereof by a U-shaped feed conveyor (500).
4. The device according to claim 1, characterized in that the first screw press (300) comprises a first press box (301) fixedly mounted in the frame (100).
5. The device according to claim 1, characterized in that the lower end of the first press box (301) is connected with a first slurry guiding hopper (302) which is arranged in a left-low and right-high manner, and the lower end of the first slurry guiding hopper (302) is connected with a first discharging pipe (303).
6. An extraction method adopting the device for extracting the high-activity stevioside according to any one of the claims 1-5, characterized by comprising the following steps:
1) Weighing a certain amount of stevia rebaudiana leaves, drying the stevia rebaudiana leaves, crushing and sieving the dried stevia rebaudiana leaves for later use;
2) Soaking sieved stevia rebaudiana into the extracting solution, fishing out the stevia rebaudiana after soaking, sequentially performing primary squeezing and secondary squeezing in the spiral squeezing equipment of any one of claims 1 to 5, and mixing squeezed liquid obtained by the secondary squeezing with soaking liquid to obtain the extracting solution;
3) Centrifuging the obtained extract to remove impurities, and then decoloring and deodorizing the centrifugate after the impurities are removed;
4) Sequentially washing the column and analyzing the decolored and deodorized extract, and carrying out vacuum concentration on the analyzed solution;
5) And finally, spraying the concentrated solution in a spray drying tower to convert the sugar solution into powdery solid, thus obtaining the high-activity stevioside.
7. The method for extracting the high-activity stevioside according to claim 1, wherein the water content of the dried stevia rebaudiana leaves in the step 1) is controlled to be 18-32%, and the mesh number of the dried stevia rebaudiana leaves sieved is 100-200 meshes.
8. The method for extracting the high-activity stevioside according to claim 1, wherein the temperature for vacuum concentration of the analysis solution in the step 4) is controlled between 56 ℃ and 64 ℃.
9. Use of the high-activity stevioside prepared from any one of claims 6 to 8 in food.
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